diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index bc40201..b2b2155 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -5,6 +5,7 @@ on:
     types: [published]
 
 permissions:
+  id-token: write  # Required for OIDC
   contents: read
 
 jobs:
@@ -14,7 +15,7 @@ jobs:
     permissions: write-all
     steps:
       - name: Checkout repository
-        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -27,12 +28,15 @@ jobs:
           git push origin release
 
       - name: Set up Node.js
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        uses: actions/setup-node@v4
         with:
           node-version: 22
           cache: 'npm'
           registry-url: https://registry.npmjs.org
 
+      - name: Update npm
+        run: npm install -g npm@latest
+
       - name: Get package.json version
         id: package-json-version
         run: echo "version=v$(cat package.json | jq '.version' --raw-output)" >> $GITHUB_OUTPUT
@@ -58,11 +62,7 @@ jobs:
         run: gh release upload ${{ github.event.release.tag_name }} dist/bundles/mediabunny.cjs dist/bundles/mediabunny.min.cjs dist/bundles/mediabunny.mjs dist/bundles/mediabunny.min.mjs dist/mediabunny.d.ts packages/mp3-encoder/dist/bundles/mediabunny-mp3-encoder.js packages/mp3-encoder/dist/bundles/mediabunny-mp3-encoder.min.js packages/mp3-encoder/dist/bundles/mediabunny-mp3-encoder.mjs packages/mp3-encoder/dist/bundles/mediabunny-mp3-encoder.min.mjs packages/mp3-encoder/dist/mediabunny-mp3-encoder.d.ts
 
       - name: Publish Mediabunny to npm
-        run: npm publish --provenance --access public
-        env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npm publish --access public
 
       - name: Publish workspace packages to npm
-        run: npm publish --provenance --access public --workspaces 
-        env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npm publish --access public --workspaces 
diff --git a/README.md b/README.md
index fe4ce48..738f4fb 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,10 @@ Mediabunny is a JavaScript library for reading, writing, and converting media fi
 
 <div align="center">
   <a href="https://remotion.dev/" target="_blank" rel="sponsored">
-    <img src="./docs/public/sponsors/remotion.png" width="60" height="60" alt="Remotion">
+    <picture>
+      <source srcset="./docs/public/sponsors/remotion-dark.png" media="(prefers-color-scheme: dark)">
+      <img src="./docs/public/sponsors/remotion-light.png" width="60" height="60" alt="Remotion">
+    </picture>
   </a>
   &nbsp;&nbsp;&nbsp;&nbsp;
   <a href="https://www.gling.ai/" target="_blank" rel="sponsored">
@@ -39,6 +42,10 @@ Mediabunny is a JavaScript library for reading, writing, and converting media fi
   <a href="https://pqina.nl/pintura/" target="_blank" rel="sponsored">
     <img src="./docs/public/sponsors/pintura-labs.png" width="50" height="50" alt="Pintura Labs">
   </a>
+  &nbsp;&nbsp;&nbsp;&nbsp;
+  <a href="https://ponder.ai/" target="_blank" rel="sponsored">
+    <img src="./docs/public/sponsors/ponder.png" width="50" height="50" alt="Ponder">
+  </a>
 </div>
 
 ### Bronze sponsors
diff --git a/dev/convert.html b/dev/convert.html
index 79b7ae3..36a2645 100644
--- a/dev/convert.html
+++ b/dev/convert.html
@@ -58,6 +58,7 @@
 			audio: (_, n) => ({
 				discard: n > 1,
 				//codec: 'opus',
+				//codec: 'opus',
 				/*
 				process: (sample) => {
 					return sample;
@@ -99,7 +100,12 @@
 			},
 			*/
 			video: () => ({
+				allowRotationMetadata: false,
+				//width: 720,
+				//frameRate: 30,
+				//bitrate: Mediabunny.QUALITY_VERY_LOW,
 				//discard: true,
+				/*
 				process: (sample) => {
 					if (!ctx) {
 						// Create a canvas for image compositing
@@ -118,6 +124,7 @@
 
 					return ctx.canvas;
 				},
+				*/
 				//width: 300,
 				//alpha: 'keep',
 				//width: 320,
@@ -173,8 +180,8 @@
 				}
 			},
 			trim: {
-				//start: 0,
-				//end: 10
+				start: 0,
+				end: 4
 			},
 		});
 		console.log(conversion);
diff --git a/dev/demux.html b/dev/demux.html
index fc1e694..197f091 100644
--- a/dev/demux.html
+++ b/dev/demux.html
@@ -45,7 +45,51 @@
 			source: new Mediabunny.BlobSource(file),
 		});
 
-		const videoTrack = await input.getPrimaryAudioTrack();
+		const videoTrack = await input.getPrimaryVideoTrack();
+		const sink = new Mediabunny.EncodedPacketSink(videoTrack);
+
+		for await (const packet of sink.packets()) {
+			console.log(packet);
+		}
+
+
+		/*
+		const videoTrack = await input.getPrimaryVideoTrack();
+		const sink = new Mediabunny.EncodedPacketSink(videoTrack);
+
+		for await (const packet of sink.packets()) {
+			console.log(packet);
+		}
+		*/
+
+		/*
+		return;
+
+		const audioTrack = await input.getPrimaryAudioTrack();
+		const sink = new Mediabunny.EncodedPacketSink(audioTrack);
+
+		for await (const packet of sink.packets()) {
+			console.log(packet.timestamp, packet.duration, packet.type)
+		}
+		*/
+
+		/*
+		const audioTrack = await input.getPrimaryAudioTrack();
+		const sink = new Mediabunny.AudioSampleSink(audioTrack);
+
+		let lastEnd = 0;
+		for await (const sample of sink.samples()) {
+			if (sample.timestamp - lastEnd > 0) {
+				console.warn(sample.timestamp - lastEnd)
+				console.log(sample.timestamp, sample.duration, "diffie", sample.timestamp - lastEnd);
+			}
+
+			lastEnd = sample.timestamp + sample.duration;
+			sample.close();
+		}
+		*/
+		
+		/*
 		const sink = new Mediabunny.EncodedPacketSink(videoTrack);
 
 		for await (const packet of sink.packets()) {
@@ -53,6 +97,7 @@
 
 			if (packet.timestamp > 10) break;
 		}
+		*/
 
 		/*
 		const sink = new Mediabunny.VideoSampleSink(videoTrack);
diff --git a/dev/live.html b/dev/live.html
index afcb991..8eef45b 100644
--- a/dev/live.html
+++ b/dev/live.html
@@ -1,6 +1,7 @@
 <button>Go</button>
 
 <script src="../dist/bundles/mediabunny.cjs"></script>
+<script src="../packages/mp3-encoder/dist/bundles/mediabunny-mp3-encoder.js"></script>
 
 <script type="module">
     function download(blob, filename) {
@@ -12,6 +13,8 @@
 		URL.revokeObjectURL(url);
 	}
 
+	MediabunnyMp3Encoder.registerMp3Encoder();
+
     const button = document.querySelector('button');
     button.addEventListener('click', async () => {
         const stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
@@ -22,29 +25,41 @@
             target: new Mediabunny.BufferTarget(),
             format: new Mediabunny.Mp4OutputFormat(),
         });
+		let videoSource = null;
+		let audioSource = null;
         if (videoTrack) {
-            const source = new Mediabunny.MediaStreamVideoTrackSource(videoTrack, {
+            videoSource = new Mediabunny.MediaStreamVideoTrackSource(videoTrack, {
                 codec: 'avc',
                 bitrate: Mediabunny.QUALITY_MEDIUM
             });
 
-            source.errorPromise.catch((d) => console.log("Hello?????", d));
+            videoSource.errorPromise.catch((d) => console.log("Hello?????", d));
 
-            output.addVideoTrack(source);
+            output.addVideoTrack(videoSource);
         }
         if (audioTrack) {
-            const source = new Mediabunny.MediaStreamAudioTrackSource(audioTrack, {
-                codec: 'aac',
+            audioSource = new Mediabunny.MediaStreamAudioTrackSource(audioTrack, {
+                codec: 'mp3',
                 bitrate: Mediabunny.QUALITY_MEDIUM
             });
 
-            source.errorPromise.catch((d) => console.log("Hello!!???", d));
+            audioSource.errorPromise.catch((d) => console.log("Hello!!???", d));
 
-            output.addAudioTrack(source);
+            output.addAudioTrack(audioSource);
         }
 
         await output.start();
 
+		setTimeout(() => {
+			videoSource?.pause();
+			audioSource?.pause();
+
+			setTimeout(() => {
+				videoSource?.resume();
+				audioSource?.resume();
+			}, 1000);
+		}, 1000);
+
         await new Promise(resolve => setTimeout(resolve, 5000));
 
         await output.finalize();
diff --git a/docs/.vitepress/config.mts b/docs/.vitepress/config.mts
index 6a1502a..a1e44e7 100644
--- a/docs/.vitepress/config.mts
+++ b/docs/.vitepress/config.mts
@@ -14,6 +14,9 @@ export default withMermaid({
 	title: 'Mediabunny',
 	description: DESCRIPTION,
 	cleanUrls: true,
+	sitemap: {
+		hostname: 'https://mediabunny.dev',
+	},
 	head: [
 		['link', { rel: 'icon', type: 'image/png', href: '/mediabunny-logo.png' }],
 		['link', { rel: 'icon', type: 'image/svg+xml', href: '/mediabunny-logo.svg' }],
@@ -34,7 +37,7 @@ export default withMermaid({
 		// https://vitepress.dev/reference/default-theme-config
 		nav: [
 			{ text: 'Guide', link: '/guide/introduction', activeMatch: '/guide' },
-			{ text: 'API', link: '/api', activeMatch: '/api' },
+			{ text: 'API', link: '/api/', activeMatch: '/api' },
 			{ text: 'LLMs', link: '/llms', activeMatch: '/llms' },
 			{ text: 'Examples', link: '/examples', activeMatch: '/examples' },
 			{ text: 'Sponsors', link: '/#sponsors', activeMatch: '/#sponsors' },
diff --git a/docs/examples.md b/docs/examples.md
index 7c65313..68ce4ff 100644
--- a/docs/examples.md
+++ b/docs/examples.md
@@ -9,37 +9,37 @@ hero:
 features:
     - title: Metadata extraction
       details: Extract various metadata from an input media file.
-      link: /examples/metadata-extraction
+      link: /examples/metadata-extraction/
       target: _self
       icon:
         src: /mingcute--file-info-line.svg
     - title: Thumbnail generation
       details: Generate multiple small thumbnails for a video track.
-      link: /examples/thumbnail-generation
+      link: /examples/thumbnail-generation/
       target: _self
       icon:
         src: /mingcute--photo-album-line.svg
     - title: Media player (advanced)
       details: "A full video & audio media player, implemented from scratch with Mediabunny, with microsecond playback accuracy."
-      link: /examples/media-player
+      link: /examples/media-player/
       target: _self
       icon:
         src: /mingcute--video-line.svg
     - title: File compression
       details: Convert an input file to a highly-compressed MP4 file.
-      link: /examples/file-compression
+      link: /examples/file-compression/
       target: _self
       icon:
         src: /mingcute--file-zip-line.svg
     - title: Procedural video generation
       details: Generate a video file as fast as the hardware allows.
-      link: /examples/procedural-generation
+      link: /examples/procedural-generation/
       target: _self
       icon:
         src: /mingcute--magic-3-line.svg
     - title: Live recording & streaming
       details: Record a video from live sources and stream it to a video element.
-      link: /examples/live-recording	
+      link: /examples/live-recording/
       target: _self
       icon:
         src: /mingcute--microphone-line.svg
diff --git a/docs/guide/converting-media-files.md b/docs/guide/converting-media-files.md
index b54c9e1..43d812a 100644
--- a/docs/guide/converting-media-files.md
+++ b/docs/guide/converting-media-files.md
@@ -120,11 +120,13 @@ type ConversionVideoOptions = {
 	height?: number;
 	fit?: 'fill' | 'contain' | 'cover';
 	rotate?: 0 | 90 | 180 | 270;
+	allowRotationMetadata?: boolean;
 	crop?: { left: number; top: number; width: number; height: number };
 	frameRate?: number;
 	codec?: VideoCodec;
 	bitrate?: number | Quality;
 	alpha?: 'discard' | 'keep'; // Defaults to 'discard'
+	hardwareAcceleration?: 'no-preference' | 'prefer-hardware' | 'prefer-software';
 	keyFrameInterval?: number;
 	forceTranscode?: boolean;
 	process?: (sample: VideoSample) => MaybePromise<
@@ -175,6 +177,8 @@ In the rare case that the input video changes size over time, the `fit` field ca
 
 `rotation` rotates the video by the specified number of degrees clockwise. This rotation is applied on top of any rotation metadata in the original input file and happens before cropping and resizing.
 
+By default, Mediabunny will try to make use of rotation metadata in the output file to perform the rotation whenever possible. However, if you don't want this to happen, or you want to use Mediabunny to strip all rotation metadata from a file, you can set `allowRotationMetadata` to `false`.
+
 ### Cropping video
 
 `crop` can be used to extract a rectangular region from the original video. The rectangle is specified using `left`, `top`, `width` and `height` and is clamped to the dimensions of the video. Cropping is applied after rotation but before resizing.
@@ -190,9 +194,10 @@ Use the `codec` property to control the codec of the output track. This should b
 Use the `bitrate` property to control the bitrate of the output video. For example, you can use this field to compress the video track. Accepted values are the number of bits per second or a [subjective quality](./media-sources#subjective-qualities). If this property is set, transcoding will always happen. If this property is not set but transcoding is still required, `QUALITY_HIGH` will be used as the value.
 
 Use the `keyFrameInterval` property to control the maximum interval in seconds between key frames in the output video. Setting this fields forces a transcode.
-
 If you want to prevent direct copying of media data and force a transcoding step, use `forceTranscode: true`.
 
+Use the `hardwareAcceleration` property to control whether hardware or software acceleration is used for video transcoding.
+
 ### Processing video
 
 The `process` property can be used to define a custom video sample processing function, e.g. for [applying overlays](./quick-start#add-a-video-overlay), color transformations, or timestamp modifications. You are expected to perform this processing yourself, for example using the Canvas API.
@@ -445,4 +450,4 @@ On the flip side, you can always query which input tracks made it into the outpu
 ```ts
 const conversion = await Conversion.init({ input, output });
 conversion.utilizedTracks; // => InputTrack[]
-```
\ No newline at end of file
+```
diff --git a/docs/guide/media-sources.md b/docs/guide/media-sources.md
index a013bf4..31caa1f 100644
--- a/docs/guide/media-sources.md
+++ b/docs/guide/media-sources.md
@@ -187,6 +187,16 @@ videoTrackSource.errorPromise.catch((error) => ...);
 
 This source requires no additional method calls; data will automatically be captured and piped to the output file as soon as `start()` is called on the `Output`. Make sure to `stop()` on `videoTrack` after finalizing the `Output` if you don't need the user's media anymore.
 
+If you want to temporarily stop capturing video frames from this source, you can use the `pause()` and `resume()` methods:
+```ts
+videoTrackSource.pause();
+
+// Later:
+videoTrackSource.resume();
+```
+
+While paused, video frames emitted by the stream will be ignored. When resumed, video frames are let through again, offset in timestamp such that the result plays back continuously with no gap in playback. Note that pausing does *not* stop the underlying media stream.
+
 ::: info
 If this source is the only MediaStreamTrack source in the `Output`, then the first video sample added by it starts at timestamp 0. If there are multiple, then the earliest media sample across all tracks starts at timestamp 0, and all tracks will be perfectly synchronized with each other.
 :::
@@ -344,6 +354,16 @@ audioTrackSource.errorPromise.catch((error) => ...);
 
 This source requires no additional method calls; data will automatically be captured and piped to the output file as soon as `start()` is called on the `Output`. Make sure to `stop()` on `audioTrack` after finalizing the `Output` if you don't need the user's media anymore.
 
+If you want to temporarily stop capturing audio data from this source, you can use the `pause()` and `resume()` methods:
+```ts
+audioTrackSource.pause();
+
+// Later:
+audioTrackSource.resume();
+```
+
+While paused, audio data emitted by the stream will be ignored. When resumed, audio data are let through again, offset in timestamp such that the result plays back continuously with no gap in playback. Note that pausing does *not* stop the underlying media stream.
+
 ::: info
 If this source is the only MediaStreamTrack source in the `Output`, then the first audio sample added by it starts at timestamp 0. If there are multiple, then the earliest media sample across all tracks starts at timestamp 0, and all tracks will be perfectly synchronized with each other.
 :::
@@ -433,4 +453,12 @@ await textSource.add('00:00:00.000 --> 00:00:02.000\nHello there!\n\n');
 await textSource.add('00:00:02.500 --> 00:00:04.000\nChunky chunks.\n\n');
 ```
 
-The chunks have certain constraints: A cue must be fully contained within a chunk and cannot be split across multiple smaller chunks (although a chunk can contain multiple cues). Also, the WebVTT preamble must be added first and all at once.
\ No newline at end of file
+The chunks have certain constraints: A cue must be fully contained within a chunk and cannot be split across multiple smaller chunks (although a chunk can contain multiple cues). Also, the WebVTT preamble must be added first and all at once.
+
+::: info
+For QuickTime to display WebVTT subtitles, it typically expects alignment information to be specified:
+```
+00:00:00.000 --> 00:00:02.000 align:center
+This is your last chance.
+```
+:::
\ No newline at end of file
diff --git a/docs/guide/packets-and-samples.md b/docs/guide/packets-and-samples.md
index 18baa04..aa5c295 100644
--- a/docs/guide/packets-and-samples.md
+++ b/docs/guide/packets-and-samples.md
@@ -378,13 +378,11 @@ const bytesNeeded = videoSample.allocationSize(); // => number
 Then, use `copyTo` to copy the pixel data into the destination buffer:
 ```ts
 const bytes = new Uint8Array(bytesNeeded);
-videoSample.copyTo(bytes);
+const planeLayout = await videoSample.copyTo(bytes);
 ```
 
 ::: info
-The data will always be in the pixel format specified in the `format` field.
-
-To convert the data into a different pixel format, or to extract only a section of the frame, please use the [`allocationSize`](https://developer.mozilla.org/en-US/docs/Web/API/VideoFrame/allocationSize) and [`copyTo`](https://developer.mozilla.org/en-US/docs/Web/API/VideoFrame/copyTo) methods on `VideoFrame` instead. Get a `VideoFrame` by running `videoSample.toVideoFrame()`.
+You can pass additional options to `allocationSize` and `copyTo` to extract data in a different pixel format.
 :::
 
 ---
diff --git a/docs/guide/reading-media-files.md b/docs/guide/reading-media-files.md
index 8457088..dab7aec 100644
--- a/docs/guide/reading-media-files.md
+++ b/docs/guide/reading-media-files.md
@@ -106,6 +106,10 @@ track.languageCode; // => string
 
 // A user-defined name for this track.
 track.name; // => string
+
+// Information about the intended usage of the track
+// (default, commentary, hearing-impaired, visually-impaired, etc.)
+track.disposition; // TrackDisposition
 ```
 
 #### Codec information
diff --git a/docs/guide/writing-media-files.md b/docs/guide/writing-media-files.md
index c9ef8ed..6882eb4 100644
--- a/docs/guide/writing-media-files.md
+++ b/docs/guide/writing-media-files.md
@@ -56,6 +56,7 @@ output.addVideoTrack(videoSource, {
 output.addAudioTrack(audioSourceEng, {
 	language: 'eng', // ISO 639-2/T language code
 	name: 'Developer Commentary', // Sets a user-defined track name
+	disposition: { commentary: true }, // Sets additional flags in the file
 });
 output.addAudioTrack(audioSourceGer, {
 	language: 'ger',
diff --git a/docs/index.md b/docs/index.md
index 760eae2..6bb3731 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -91,13 +91,14 @@ const bundleSizes = [
 
 const sponsors = {
 	gold: [
-		{ image: '/sponsors/remotion.png', name: 'Remotion', url: 'https://remotion.dev/' },
+		{ image: '/sponsors/remotion-light.png', name: 'Remotion', url: 'https://remotion.dev/' },
 		{ image: '/sponsors/gling.svg', name: 'Gling AI', url: 'https://www.gling.ai/' },
 		{ image: '/sponsors/diffusionstudio.png', name: 'Diffusion Studio', url: 'https://diffusion.studio/' },
 		{ image: '/sponsors/kino.jpg', name: 'Kino', url: 'https://kino.ai/' },
 	],
 	silver: [
 		{ image: '/sponsors/pintura-labs.png', name: 'Pintura Labs', url: 'https://pqina.nl/pintura/' },
+		{ image: '/sponsors/ponder.png', name: 'Ponder', url: 'https://ponder.ai/' },
 	],
 	bronze: [
 		{ image: '/sponsors/rve.png', name: 'React Video Editor', url: 'https://www.reactvideoeditor.com/' },
@@ -105,6 +106,8 @@ const sponsors = {
 		{ image: '/sponsors/jellypod.png', name: 'Jellypod', url: 'https://jellypod.ai/' },
 	],
 	individual: [
+		{ image: 'https://avatars.githubusercontent.com/u/82552321', name: 'Polotno', url: 'https://github.com/polotno-project' },
+		{ image: 'https://avatars.githubusercontent.com/u/489051', name: 'Roman Rädle', url: 'https://github.com/raedle' },
 		{ image: 'https://avatars.githubusercontent.com/u/197597', name: 'Christopher Chedeau', url: 'https://github.com/vjeux' },
 		{ image: 'https://avatars.githubusercontent.com/u/84167135', name: 'Memenome', url: 'https://github.com/memenome' },
 		{ image: 'https://avatars.githubusercontent.com/u/5913254', name: 'Brandon McConnell', url: 'https://github.com/brandonmcconnell' },
@@ -113,6 +116,7 @@ const sponsors = {
 		{ image: 'https://avatars.githubusercontent.com/u/2698271', name: 'Matthew Gardner', url: 'https://github.com/spheric' },
 		{ image: 'https://avatars.githubusercontent.com/u/5475819', name: 'AJ Funk', url: 'https://github.com/AJFunk' },
 		{ image: 'https://avatars.githubusercontent.com/u/30229596', name: 'Pablo Bonilla', url: 'https://github.com/devPablo' },
+		{ image: 'https://avatars.githubusercontent.com/u/56988069', name: 'SyhabouthAlex', url: 'https://github.com/SyhabouthAlex' },
 		{ image: 'https://avatars.githubusercontent.com/u/38181164', name: 'wcw', url: 'https://github.com/asd55667' },
 		{ image: 'https://avatars.githubusercontent.com/u/1836701', name: 'Bean Deng', url: 'https://github.com/HADB' },
 		{ image: 'https://avatars.githubusercontent.com/u/63088713', name: 'taf2000', url: 'https://github.com/taf2000' },
@@ -122,6 +126,7 @@ const sponsors = {
 		{ image: 'https://avatars.githubusercontent.com/u/97225946', name: '808vita', url: 'https://github.com/808vita' },
 		{ image: 'https://avatars.githubusercontent.com/u/3709646', name: 'Rodrigo Belfiore', url: 'https://github.com/roprgm' },
 		{ image: 'https://avatars.githubusercontent.com/u/31102694', name: 'Aiden Liu', url: 'https://github.com/aidenlx' },
+		{ image: 'https://avatars.githubusercontent.com/u/41021374', name: 'arthco', url: 'https://github.com/arthtyagi' },
 	],
 };
 </script>
diff --git a/docs/public/sponsors/ponder.png b/docs/public/sponsors/ponder.png
new file mode 100644
index 0000000..d335a62
Binary files /dev/null and b/docs/public/sponsors/ponder.png differ
diff --git a/docs/public/sponsors/remotion-dark.png b/docs/public/sponsors/remotion-dark.png
new file mode 100644
index 0000000..04e6ea1
Binary files /dev/null and b/docs/public/sponsors/remotion-dark.png differ
diff --git a/docs/public/sponsors/remotion-light.png b/docs/public/sponsors/remotion-light.png
new file mode 100644
index 0000000..74b3592
Binary files /dev/null and b/docs/public/sponsors/remotion-light.png differ
diff --git a/docs/public/sponsors/remotion.png b/docs/public/sponsors/remotion.png
deleted file mode 100644
index f76b061..0000000
Binary files a/docs/public/sponsors/remotion.png and /dev/null differ
diff --git a/examples/live-recording/live-recording.ts b/examples/live-recording/live-recording.ts
index d52f9bc..d3d97a3 100644
--- a/examples/live-recording/live-recording.ts
+++ b/examples/live-recording/live-recording.ts
@@ -21,7 +21,7 @@ const context = canvas.getContext('2d', { alpha: false, desynchronized: true })!
 
 const frameRate = 30;
 
-const chunks: Uint8Array[] = [];
+const chunks: Uint8Array<ArrayBuffer>[] = [];
 let recording = false;
 let output: Output;
 let videoSource: CanvasSource;
diff --git a/examples/metadata-extraction/metadata-extraction.ts b/examples/metadata-extraction/metadata-extraction.ts
index e5cf198..d2bc280 100644
--- a/examples/metadata-extraction/metadata-extraction.ts
+++ b/examples/metadata-extraction/metadata-extraction.ts
@@ -97,7 +97,7 @@ const extractMetadata = (resource: File | string) => {
 				'Lyrics': tags.lyrics,
 				'Comment': tags.comment,
 				'Images': tags.images?.map((image) => {
-					const blob = new Blob([image.data], { type: image.mimeType });
+					const blob = new Blob([image.data.slice()], { type: image.mimeType });
 					const element = new Image();
 					element.src = URL.createObjectURL(blob);
 
diff --git a/package-lock.json b/package-lock.json
index 271da7e..1abaef6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mediabunny",
-  "version": "1.24.5",
+  "version": "1.27.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mediabunny",
-      "version": "1.24.5",
+      "version": "1.27.2",
       "license": "MPL-2.0",
       "workspaces": [
         "packages/*"
@@ -19,7 +19,7 @@
         "@eslint/js": "^9.22.0",
         "@fontsource-variable/rubik": "^5.2.6",
         "@fontsource/dm-mono": "^5.2.6",
-        "@microsoft/api-extractor": "^7.52.1",
+        "@microsoft/api-extractor": "^7.55.1",
         "@stylistic/eslint-plugin": "^4.2.0",
         "@tailwindcss/vite": "^4.1.7",
         "@types/markdown-it-footnote": "^3.0.4",
@@ -34,8 +34,8 @@
         "mermaid": "^11.6.0",
         "tailwindcss": "^4.1.7",
         "tsx": "^4.19.4",
-        "typescript": "^5.8.2",
-        "typescript-eslint": "^8.26.1",
+        "typescript": "^5.9.3",
+        "typescript-eslint": "^8.48.0",
         "vite": "^6.3.5",
         "vitepress": "^1.6.3",
         "vitepress-plugin-llms": "^1.5.1",
@@ -923,10 +923,11 @@
       }
     },
     "node_modules/@eslint-community/eslint-utils": {
-      "version": "4.4.1",
-      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.1.tgz",
-      "integrity": "sha512-s3O3waFUrMV8P/XaF/+ZTp1X9XBZW1a4B97ZnjQF2KYWaFD2A8KyFBsrsfSjEmjn3RGWAIuvlneuZm3CUK3jbA==",
+      "version": "4.9.0",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.0.tgz",
+      "integrity": "sha512-ayVFHdtZ+hsq1t2Dy24wCmGXGe4q9Gu3smhLYALJrr473ZH27MsnSL+LKUlimp4BWJqMDMLmPpx/Q9R3OAlL4g==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "eslint-visitor-keys": "^3.4.3"
       },
@@ -1449,21 +1450,22 @@
       }
     },
     "node_modules/@microsoft/api-extractor": {
-      "version": "7.52.1",
-      "resolved": "https://registry.npmjs.org/@microsoft/api-extractor/-/api-extractor-7.52.1.tgz",
-      "integrity": "sha512-m3I5uAwE05orsu3D1AGyisX5KxsgVXB+U4bWOOaX/Z7Ftp/2Cy41qsNhO6LPvSxHBaapyser5dVorF1t5M6tig==",
+      "version": "7.55.1",
+      "resolved": "https://registry.npmjs.org/@microsoft/api-extractor/-/api-extractor-7.55.1.tgz",
+      "integrity": "sha512-l8Z+8qrLkZFM3HM95Dbpqs6G39fpCa7O5p8A7AkA6hSevxkgwsOlLrEuPv0ADOyj5dI1Af5WVDiwpKG/ya5G3w==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@microsoft/api-extractor-model": "7.30.4",
-        "@microsoft/tsdoc": "~0.15.1",
-        "@microsoft/tsdoc-config": "~0.17.1",
-        "@rushstack/node-core-library": "5.12.0",
-        "@rushstack/rig-package": "0.5.3",
-        "@rushstack/terminal": "0.15.1",
-        "@rushstack/ts-command-line": "4.23.6",
+        "@microsoft/api-extractor-model": "7.32.1",
+        "@microsoft/tsdoc": "~0.16.0",
+        "@microsoft/tsdoc-config": "~0.18.0",
+        "@rushstack/node-core-library": "5.19.0",
+        "@rushstack/rig-package": "0.6.0",
+        "@rushstack/terminal": "0.19.4",
+        "@rushstack/ts-command-line": "5.1.4",
+        "diff": "~8.0.2",
         "lodash": "~4.17.15",
-        "minimatch": "~3.0.3",
+        "minimatch": "10.0.3",
         "resolve": "~1.22.1",
         "semver": "~7.5.4",
         "source-map": "~0.6.1",
@@ -1474,75 +1476,51 @@
       }
     },
     "node_modules/@microsoft/api-extractor-model": {
-      "version": "7.30.4",
-      "resolved": "https://registry.npmjs.org/@microsoft/api-extractor-model/-/api-extractor-model-7.30.4.tgz",
-      "integrity": "sha512-RobC0gyVYsd2Fao9MTKOfTdBm41P/bCMUmzS5mQ7/MoAKEqy0FOBph3JOYdq4X4BsEnMEiSHc+0NUNmdzxCpjA==",
+      "version": "7.32.1",
+      "resolved": "https://registry.npmjs.org/@microsoft/api-extractor-model/-/api-extractor-model-7.32.1.tgz",
+      "integrity": "sha512-u4yJytMYiUAnhcNQcZDTh/tVtlrzKlyKrQnLOV+4Qr/5gV+cpufWzCYAB1Q23URFqD6z2RoL2UYncM9xJVGNKA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@microsoft/tsdoc": "~0.15.1",
-        "@microsoft/tsdoc-config": "~0.17.1",
-        "@rushstack/node-core-library": "5.12.0"
+        "@microsoft/tsdoc": "~0.16.0",
+        "@microsoft/tsdoc-config": "~0.18.0",
+        "@rushstack/node-core-library": "5.19.0"
+      }
+    },
+    "node_modules/@microsoft/api-extractor/node_modules/typescript": {
+      "version": "5.8.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.8.2.tgz",
+      "integrity": "sha512-aJn6wq13/afZp/jT9QZmwEjDqqvSGp1VT5GVg+f/t6/oVyrgXM6BY1h9BRh/O5p3PlUPAe+WuiEZOmb/49RqoQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
       }
     },
     "node_modules/@microsoft/tsdoc": {
-      "version": "0.15.1",
-      "resolved": "https://registry.npmjs.org/@microsoft/tsdoc/-/tsdoc-0.15.1.tgz",
-      "integrity": "sha512-4aErSrCR/On/e5G2hDP0wjooqDdauzEbIq8hIkIe5pXV0rtWJZvdCEKL0ykZxex+IxIwBp0eGeV48hQN07dXtw==",
+      "version": "0.16.0",
+      "resolved": "https://registry.npmjs.org/@microsoft/tsdoc/-/tsdoc-0.16.0.tgz",
+      "integrity": "sha512-xgAyonlVVS+q7Vc7qLW0UrJU7rSFcETRWsqdXZtjzRU8dF+6CkozTK4V4y1LwOX7j8r/vHphjDeMeGI4tNGeGA==",
       "dev": true,
       "license": "MIT"
     },
     "node_modules/@microsoft/tsdoc-config": {
-      "version": "0.17.1",
-      "resolved": "https://registry.npmjs.org/@microsoft/tsdoc-config/-/tsdoc-config-0.17.1.tgz",
-      "integrity": "sha512-UtjIFe0C6oYgTnad4q1QP4qXwLhe6tIpNTRStJ2RZEPIkqQPREAwE5spzVxsdn9UaEMUqhh0AqSx3X4nWAKXWw==",
+      "version": "0.18.0",
+      "resolved": "https://registry.npmjs.org/@microsoft/tsdoc-config/-/tsdoc-config-0.18.0.tgz",
+      "integrity": "sha512-8N/vClYyfOH+l4fLkkr9+myAoR6M7akc8ntBJ4DJdWH2b09uVfr71+LTMpNyG19fNqWDg8KEDZhx5wxuqHyGjw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@microsoft/tsdoc": "0.15.1",
+        "@microsoft/tsdoc": "0.16.0",
         "ajv": "~8.12.0",
         "jju": "~1.4.0",
         "resolve": "~1.22.2"
       }
     },
-    "node_modules/@nodelib/fs.scandir": {
-      "version": "2.1.5",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
-      "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@nodelib/fs.stat": "2.0.5",
-        "run-parallel": "^1.1.9"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
-    },
-    "node_modules/@nodelib/fs.stat": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
-      "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 8"
-      }
-    },
-    "node_modules/@nodelib/fs.walk": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
-      "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@nodelib/fs.scandir": "2.1.5",
-        "fastq": "^1.6.0"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
-    },
     "node_modules/@pkgjs/parseargs": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
@@ -1897,9 +1875,9 @@
       ]
     },
     "node_modules/@rushstack/node-core-library": {
-      "version": "5.12.0",
-      "resolved": "https://registry.npmjs.org/@rushstack/node-core-library/-/node-core-library-5.12.0.tgz",
-      "integrity": "sha512-QSwwzgzWoil1SCQse+yCHwlhRxNv2dX9siPnAb9zR/UmMhac4mjMrlMZpk64BlCeOFi1kJKgXRkihSwRMbboAQ==",
+      "version": "5.19.0",
+      "resolved": "https://registry.npmjs.org/@rushstack/node-core-library/-/node-core-library-5.19.0.tgz",
+      "integrity": "sha512-BxAopbeWBvNJ6VGiUL+5lbJXywTdsnMeOS8j57Cn/xY10r6sV/gbsTlfYKjzVCUBZATX2eRzJHSMCchsMTGN6A==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1938,24 +1916,41 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
     },
-    "node_modules/@rushstack/rig-package": {
-      "version": "0.5.3",
-      "resolved": "https://registry.npmjs.org/@rushstack/rig-package/-/rig-package-0.5.3.tgz",
-      "integrity": "sha512-olzSSjYrvCNxUFZowevC3uz8gvKr3WTpHQ7BkpjtRpA3wK+T0ybep/SRUMfr195gBzJm5gaXw0ZMgjIyHqJUow==",
+    "node_modules/@rushstack/problem-matcher": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@rushstack/problem-matcher/-/problem-matcher-0.1.1.tgz",
+      "integrity": "sha512-Fm5XtS7+G8HLcJHCWpES5VmeMyjAKaWeyZU5qPzZC+22mPlJzAsOxymHiWIfuirtPckX3aptWws+K2d0BzniJA==",
       "dev": true,
+      "license": "MIT",
+      "peerDependencies": {
+        "@types/node": "*"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@rushstack/rig-package": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/@rushstack/rig-package/-/rig-package-0.6.0.tgz",
+      "integrity": "sha512-ZQmfzsLE2+Y91GF15c65L/slMRVhF6Hycq04D4TwtdGaUAbIXXg9c5pKA5KFU7M4QMaihoobp9JJYpYcaY3zOw==",
+      "dev": true,
+      "license": "MIT",
       "dependencies": {
         "resolve": "~1.22.1",
         "strip-json-comments": "~3.1.1"
       }
     },
     "node_modules/@rushstack/terminal": {
-      "version": "0.15.1",
-      "resolved": "https://registry.npmjs.org/@rushstack/terminal/-/terminal-0.15.1.tgz",
-      "integrity": "sha512-3vgJYwumcjoDOXU3IxZfd616lqOdmr8Ezj4OWgJZfhmiBK4Nh7eWcv8sU8N/HdzXcuHDXCRGn/6O2Q75QvaZMA==",
+      "version": "0.19.4",
+      "resolved": "https://registry.npmjs.org/@rushstack/terminal/-/terminal-0.19.4.tgz",
+      "integrity": "sha512-f4XQk02CrKfrMgyOfhYd3qWI944dLC21S4I/LUhrlAP23GTMDNG6EK5effQtFkISwUKCgD9vMBrJZaPSUquxWQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@rushstack/node-core-library": "5.12.0",
+        "@rushstack/node-core-library": "5.19.0",
+        "@rushstack/problem-matcher": "0.1.1",
         "supports-color": "~8.1.1"
       },
       "peerDependencies": {
@@ -1968,13 +1963,13 @@
       }
     },
     "node_modules/@rushstack/ts-command-line": {
-      "version": "4.23.6",
-      "resolved": "https://registry.npmjs.org/@rushstack/ts-command-line/-/ts-command-line-4.23.6.tgz",
-      "integrity": "sha512-7WepygaF3YPEoToh4MAL/mmHkiIImQq3/uAkQX46kVoKTNOOlCtFGyNnze6OYuWw2o9rxsyrHVfIBKxq/am2RA==",
+      "version": "5.1.4",
+      "resolved": "https://registry.npmjs.org/@rushstack/ts-command-line/-/ts-command-line-5.1.4.tgz",
+      "integrity": "sha512-H0I6VdJ6sOUbktDFpP2VW5N29w8v4hRoNZOQz02vtEi6ZTYL1Ju8u+TcFiFawUDrUsx/5MQTUhd79uwZZVwVlA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@rushstack/terminal": "0.15.1",
+        "@rushstack/terminal": "0.19.4",
         "@types/argparse": "1.0.38",
         "argparse": "~1.0.9",
         "string-argv": "~0.3.1"
@@ -2087,18 +2082,6 @@
         "eslint": ">=9.0.0"
       }
     },
-    "node_modules/@stylistic/eslint-plugin/node_modules/picomatch": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.2.tgz",
-      "integrity": "sha512-M7BAV6Rlcy5u+m6oPhAPFgJTzAioX/6B0DxyvDlo9l8+T3nLKbrczg2WLUyzd45L8RqfUMyGPzekbMvX2Ldkwg==",
-      "dev": true,
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/jonschlinkert"
-      }
-    },
     "node_modules/@tailwindcss/node": {
       "version": "4.1.7",
       "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.1.7.tgz",
@@ -2902,21 +2885,21 @@
       }
     },
     "node_modules/@typescript-eslint/eslint-plugin": {
-      "version": "8.26.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.26.1.tgz",
-      "integrity": "sha512-2X3mwqsj9Bd3Ciz508ZUtoQQYpOhU/kWoUqIf49H8Z0+Vbh6UF/y0OEYp0Q0axOGzaBGs7QxRwq0knSQ8khQNA==",
+      "version": "8.48.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.48.0.tgz",
+      "integrity": "sha512-XxXP5tL1txl13YFtrECECQYeZjBZad4fyd3cFV4a19LkAY/bIp9fev3US4S5fDVV2JaYFiKAZ/GRTOLer+mbyQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "@eslint-community/regexpp": "^4.10.0",
-        "@typescript-eslint/scope-manager": "8.26.1",
-        "@typescript-eslint/type-utils": "8.26.1",
-        "@typescript-eslint/utils": "8.26.1",
-        "@typescript-eslint/visitor-keys": "8.26.1",
+        "@typescript-eslint/scope-manager": "8.48.0",
+        "@typescript-eslint/type-utils": "8.48.0",
+        "@typescript-eslint/utils": "8.48.0",
+        "@typescript-eslint/visitor-keys": "8.48.0",
         "graphemer": "^1.4.0",
-        "ignore": "^5.3.1",
+        "ignore": "^7.0.0",
         "natural-compare": "^1.4.0",
-        "ts-api-utils": "^2.0.1"
+        "ts-api-utils": "^2.1.0"
       },
       "engines": {
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
@@ -2926,22 +2909,32 @@
         "url": "https://opencollective.com/typescript-eslint"
       },
       "peerDependencies": {
-        "@typescript-eslint/parser": "^8.0.0 || ^8.0.0-alpha.0",
+        "@typescript-eslint/parser": "^8.48.0",
         "eslint": "^8.57.0 || ^9.0.0",
-        "typescript": ">=4.8.4 <5.9.0"
+        "typescript": ">=4.8.4 <6.0.0"
+      }
+    },
+    "node_modules/@typescript-eslint/eslint-plugin/node_modules/ignore": {
+      "version": "7.0.5",
+      "resolved": "https://registry.npmjs.org/ignore/-/ignore-7.0.5.tgz",
+      "integrity": "sha512-Hs59xBNfUIunMFgWAbGX5cq6893IbWg4KnrjbYwX3tx0ztorVgTDA6B2sxf8ejHJ4wz8BqGUMYlnzNBer5NvGg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 4"
       }
     },
     "node_modules/@typescript-eslint/parser": {
-      "version": "8.26.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.26.1.tgz",
-      "integrity": "sha512-w6HZUV4NWxqd8BdeFf81t07d7/YV9s7TCWrQQbG5uhuvGUAW+fq1usZ1Hmz9UPNLniFnD8GLSsDpjP0hm1S4lQ==",
+      "version": "8.48.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.48.0.tgz",
+      "integrity": "sha512-jCzKdm/QK0Kg4V4IK/oMlRZlY+QOcdjv89U2NgKHZk1CYTj82/RVSx1mV/0gqCVMJ/DA+Zf/S4NBWNF8GQ+eqQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@typescript-eslint/scope-manager": "8.26.1",
-        "@typescript-eslint/types": "8.26.1",
-        "@typescript-eslint/typescript-estree": "8.26.1",
-        "@typescript-eslint/visitor-keys": "8.26.1",
+        "@typescript-eslint/scope-manager": "8.48.0",
+        "@typescript-eslint/types": "8.48.0",
+        "@typescript-eslint/typescript-estree": "8.48.0",
+        "@typescript-eslint/visitor-keys": "8.48.0",
         "debug": "^4.3.4"
       },
       "engines": {
@@ -2953,18 +2946,40 @@
       },
       "peerDependencies": {
         "eslint": "^8.57.0 || ^9.0.0",
-        "typescript": ">=4.8.4 <5.9.0"
+        "typescript": ">=4.8.4 <6.0.0"
       }
     },
-    "node_modules/@typescript-eslint/scope-manager": {
-      "version": "8.26.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-8.26.1.tgz",
-      "integrity": "sha512-6EIvbE5cNER8sqBu6V7+KeMZIC1664d2Yjt+B9EWUXrsyWpxx4lEZrmvxgSKRC6gX+efDL/UY9OpPZ267io3mg==",
+    "node_modules/@typescript-eslint/project-service": {
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@@ -12242,7 +12065,7 @@
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diff --git a/package.json b/package.json
index 3b11949..208366d 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
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     "@fontsource/dm-mono": "^5.2.6",
-    "@microsoft/api-extractor": "^7.52.1",
+    "@microsoft/api-extractor": "^7.55.1",
     "@stylistic/eslint-plugin": "^4.2.0",
     "@tailwindcss/vite": "^4.1.7",
     "@types/markdown-it-footnote": "^3.0.4",
@@ -84,8 +84,8 @@
     "mermaid": "^11.6.0",
     "tailwindcss": "^4.1.7",
     "tsx": "^4.19.4",
-    "typescript": "^5.8.2",
-    "typescript-eslint": "^8.26.1",
+    "typescript": "^5.9.3",
+    "typescript-eslint": "^8.48.0",
     "vite": "^6.3.5",
     "vitepress": "^1.6.3",
     "vitepress-plugin-llms": "^1.5.1",
diff --git a/packages/mp3-encoder/package.json b/packages/mp3-encoder/package.json
index b7d133b..d4f239b 100644
--- a/packages/mp3-encoder/package.json
+++ b/packages/mp3-encoder/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@mediabunny/mp3-encoder",
   "author": "Vanilagy",
-  "version": "1.24.5",
+  "version": "1.27.2",
   "description": "MP3 encoder extension for Mediabunny, based on LAME.",
   "main": "./dist/bundles/mediabunny-mp3-encoder.mjs",
   "module": "./dist/bundles/mediabunny-mp3-encoder.mjs",
diff --git a/packages/mp3-encoder/src/index.ts b/packages/mp3-encoder/src/index.ts
index 92aedbc..5c99658 100644
--- a/packages/mp3-encoder/src/index.ts
+++ b/packages/mp3-encoder/src/index.ts
@@ -22,7 +22,7 @@ class Mp3Encoder extends CustomAudioEncoder {
 
 	private buffer = new Uint8Array(2 ** 16);
 	private currentBufferOffset = 0;
-	private currentTimestamp = 0;
+	private currentTimestamp: number | null = null;
 	private chunkMetadata: EncodedAudioChunkMetadata = {};
 
 	static override supports(codec: AudioCodec, config: AudioDecoderConfig): boolean {
@@ -79,6 +79,11 @@ class Mp3Encoder extends CustomAudioEncoder {
 	}
 
 	async encode(audioSample: AudioSample) {
+		if (this.currentTimestamp === null) {
+			// The first sample's timestamp determines where we start
+			this.currentTimestamp = audioSample.timestamp;
+		}
+
 		const sizePerChannel = audioSample.allocationSize({
 			format: 's16-planar',
 			planeIndex: 0,
@@ -123,6 +128,8 @@ class Mp3Encoder extends CustomAudioEncoder {
 	 * these chunks and extract the MP3 frames only when they're complete.
 	 */
 	private digestOutput(bytes: Uint8Array) {
+		assert(this.currentTimestamp !== null);
+
 		const requiredBufferSize = this.currentBufferOffset + bytes.length;
 		if (requiredBufferSize > this.buffer.length) {
 			// Grow the buffer to the required size
diff --git a/src/adts/adts-demuxer.ts b/src/adts/adts-demuxer.ts
index 209365e..3295a9a 100644
--- a/src/adts/adts-demuxer.ts
+++ b/src/adts/adts-demuxer.ts
@@ -21,6 +21,7 @@ import {
 } from '../misc';
 import { EncodedPacket, PLACEHOLDER_DATA } from '../packet';
 import { readBytes, Reader } from '../reader';
+import { DEFAULT_TRACK_DISPOSITION } from '../metadata';
 import { FrameHeader, MAX_FRAME_HEADER_SIZE, MIN_FRAME_HEADER_SIZE, readFrameHeader } from './adts-reader';
 
 const SAMPLES_PER_AAC_FRAME = 1024;
@@ -188,6 +189,12 @@ class AdtsAudioTrackBacking implements InputAudioTrackBacking {
 		return sampleRate;
 	}
 
+	getDisposition() {
+		return {
+			...DEFAULT_TRACK_DISPOSITION,
+		};
+	}
+
 	async getDecoderConfig(): Promise<AudioDecoderConfig> {
 		assert(this.demuxer.firstFrameHeader);
 
diff --git a/src/codec-data.ts b/src/codec-data.ts
index 377fdea..4882752 100644
--- a/src/codec-data.ts
+++ b/src/codec-data.ts
@@ -22,9 +22,12 @@ import {
 	textEncoder,
 	toDataView,
 	toUint8Array,
+	getChromiumVersion,
+	isChromium,
+	setUint24,
 } from './misc';
 import { PacketType } from './packet';
-import { MetadataTags } from './tags';
+import { MetadataTags } from './metadata';
 
 // References for AVC/HEVC code:
 // ISO 14496-15
@@ -34,6 +37,7 @@ import { MetadataTags } from './tags';
 
 export enum AvcNalUnitType {
 	IDR = 5,
+	SEI = 6,
 	SPS = 7,
 	PPS = 8,
 	SPS_EXT = 13,
@@ -158,38 +162,54 @@ const removeEmulationPreventionBytes = (data: Uint8Array) => {
 	return new Uint8Array(result);
 };
 
-/** Converts an AVC packet in Annex B format to length-prefixed format. */
-export const transformAnnexBToLengthPrefixed = (packetData: Uint8Array) => {
-	const NAL_UNIT_LENGTH_SIZE = 4;
+const ANNEX_B_START_CODE = new Uint8Array([0, 0, 0, 1]);
 
-	const nalUnits = findNalUnitsInAnnexB(packetData);
-
-	if (nalUnits.length === 0) {
-		// If no NAL units were found, it's not valid Annex B data
-		return null;
-	}
-
-	let totalSize = 0;
-	for (const nalUnit of nalUnits) {
-		totalSize += NAL_UNIT_LENGTH_SIZE + nalUnit.byteLength;
-	}
-
-	const avccData = new Uint8Array(totalSize);
-	const dataView = new DataView(avccData.buffer);
+export const concatNalUnitsInAnnexB = (nalUnits: Uint8Array[]) => {
+	const totalLength = nalUnits.reduce((a, b) => a + ANNEX_B_START_CODE.byteLength + b.byteLength, 0);
+	const result = new Uint8Array(totalLength);
 	let offset = 0;
 
-	// Write each NAL unit with its length prefix
 	for (const nalUnit of nalUnits) {
-		const length = nalUnit.byteLength;
+		result.set(ANNEX_B_START_CODE, offset);
+		offset += ANNEX_B_START_CODE.byteLength;
 
-		dataView.setUint32(offset, length, false);
-		offset += 4;
-
-		avccData.set(nalUnit, offset);
+		result.set(nalUnit, offset);
 		offset += nalUnit.byteLength;
 	}
 
-	return avccData;
+	return result;
+};
+
+export const concatNalUnitsInLengthPrefixed = (nalUnits: Uint8Array[], lengthSize: 1 | 2 | 3 | 4) => {
+	const totalLength = nalUnits.reduce((a, b) => a + lengthSize + b.byteLength, 0);
+	const result = new Uint8Array(totalLength);
+	let offset = 0;
+
+	for (const nalUnit of nalUnits) {
+		const dataView = new DataView(result.buffer, result.byteOffset, result.byteLength);
+
+		switch (lengthSize) {
+			case 1:
+				dataView.setUint8(offset, nalUnit.byteLength);
+				break;
+			case 2:
+				dataView.setUint16(offset, nalUnit.byteLength, false);
+				break;
+			case 3:
+				setUint24(dataView, offset, nalUnit.byteLength, false);
+				break;
+			case 4:
+				dataView.setUint32(offset, nalUnit.byteLength, false);
+				break;
+		}
+
+		offset += lengthSize;
+
+		result.set(nalUnit, offset);
+		offset += nalUnit.byteLength;
+	}
+
+	return result;
 };
 
 // Data specified in ISO 14496-15
@@ -224,12 +244,27 @@ export const extractAvcNalUnits = (packetData: Uint8Array, decoderConfig: VideoD
 	}
 };
 
-const extractNalUnitTypeForAvc = (data: Uint8Array) => {
+export const concatAvcNalUnits = (nalUnits: Uint8Array[], decoderConfig: VideoDecoderConfig) => {
+	if (decoderConfig.description) {
+		// Stream is length-prefixed. Let's extract the size of the length prefix from the decoder config
+
+		const bytes = toUint8Array(decoderConfig.description);
+		const lengthSizeMinusOne = bytes[4]! & 0b11;
+		const lengthSize = (lengthSizeMinusOne + 1) as 1 | 2 | 3 | 4;
+
+		return concatNalUnitsInLengthPrefixed(nalUnits, lengthSize);
+	} else {
+		// Stream is in Annex B format
+		return concatNalUnitsInAnnexB(nalUnits);
+	}
+};
+
+export const extractNalUnitTypeForAvc = (data: Uint8Array) => {
 	return data[0]! & 0x1F;
 };
 
 /** Builds an AvcDecoderConfigurationRecord from an AVC packet in Annex B format. */
-export const extractAvcDecoderConfigurationRecord = (packetData: Uint8Array) => {
+export const extractAvcDecoderConfigurationRecord = (packetData: Uint8Array): AvcDecoderConfigurationRecord | null => {
 	try {
 		const nalUnits = findNalUnitsInAnnexB(packetData);
 
@@ -247,60 +282,27 @@ export const extractAvcDecoderConfigurationRecord = (packetData: Uint8Array) =>
 
 		// Let's get the first SPS for profile and level information
 		const spsData = spsUnits[0]!;
-		const bitstream = new Bitstream(removeEmulationPreventionBytes(spsData));
+		const spsInfo = parseAvcSps(spsData);
+		assert(spsInfo !== null);
 
-		bitstream.skipBits(1); // forbidden_zero_bit
-		bitstream.skipBits(2); // nal_ref_idc
-		const nal_unit_type = bitstream.readBits(5);
+		const hasExtendedData = spsInfo.profileIdc === 100
+			|| spsInfo.profileIdc === 110
+			|| spsInfo.profileIdc === 122
+			|| spsInfo.profileIdc === 144;
 
-		if (nal_unit_type !== 7) { // SPS NAL unit type is 7
-			console.error('Invalid SPS NAL unit type');
-			return null;
-		}
-
-		const profile_idc = bitstream.readAlignedByte();
-		const constraint_flags = bitstream.readAlignedByte();
-		const level_idc = bitstream.readAlignedByte();
-
-		const record: AvcDecoderConfigurationRecord = {
+		return {
 			configurationVersion: 1,
-			avcProfileIndication: profile_idc,
-			profileCompatibility: constraint_flags,
-			avcLevelIndication: level_idc,
+			avcProfileIndication: spsInfo.profileIdc,
+			profileCompatibility: spsInfo.constraintFlags,
+			avcLevelIndication: spsInfo.levelIdc,
 			lengthSizeMinusOne: 3, // Typically 4 bytes for length field
 			sequenceParameterSets: spsUnits,
 			pictureParameterSets: ppsUnits,
-			chromaFormat: null,
-			bitDepthLumaMinus8: null,
-			bitDepthChromaMinus8: null,
-			sequenceParameterSetExt: null,
+			chromaFormat: hasExtendedData ? spsInfo.chromaFormatIdc : null,
+			bitDepthLumaMinus8: hasExtendedData ? spsInfo.bitDepthLumaMinus8 : null,
+			bitDepthChromaMinus8: hasExtendedData ? spsInfo.bitDepthChromaMinus8 : null,
+			sequenceParameterSetExt: hasExtendedData ? spsExtUnits : null,
 		};
-
-		if (
-			profile_idc === 100
-			|| profile_idc === 110
-			|| profile_idc === 122
-			|| profile_idc === 144
-		) {
-			readExpGolomb(bitstream); // seq_parameter_set_id
-
-			const chroma_format_idc = readExpGolomb(bitstream);
-
-			if (chroma_format_idc === 3) {
-				bitstream.skipBits(1); // separate_colour_plane_flag
-			}
-
-			const bit_depth_luma_minus8 = readExpGolomb(bitstream);
-
-			const bit_depth_chroma_minus8 = readExpGolomb(bitstream);
-
-			record.chromaFormat = chroma_format_idc;
-			record.bitDepthLumaMinus8 = bit_depth_luma_minus8;
-			record.bitDepthChromaMinus8 = bit_depth_chroma_minus8;
-			record.sequenceParameterSetExt = spsExtUnits;
-		}
-
-		return record;
 	} catch (error) {
 		console.error('Error building AVC Decoder Configuration Record:', error);
 		return null;
@@ -377,6 +379,206 @@ export const serializeAvcDecoderConfigurationRecord = (record: AvcDecoderConfigu
 	return new Uint8Array(bytes);
 };
 
+/** Deserializes an AvcDecoderConfigurationRecord from the format specified in Section 5.3.3.1 of ISO 14496-15. */
+export const deserializeAvcDecoderConfigurationRecord = (data: Uint8Array): AvcDecoderConfigurationRecord | null => {
+	try {
+		const view = toDataView(data);
+		let offset = 0;
+
+		// Read header
+		const configurationVersion = view.getUint8(offset++);
+		const avcProfileIndication = view.getUint8(offset++);
+		const profileCompatibility = view.getUint8(offset++);
+		const avcLevelIndication = view.getUint8(offset++);
+		const lengthSizeMinusOne = view.getUint8(offset++) & 0x03;
+
+		const numOfSequenceParameterSets = view.getUint8(offset++) & 0x1F;
+
+		// Read SPS
+		const sequenceParameterSets: Uint8Array[] = [];
+		for (let i = 0; i < numOfSequenceParameterSets; i++) {
+			const length = view.getUint16(offset, false);
+			offset += 2;
+
+			sequenceParameterSets.push(data.subarray(offset, offset + length));
+			offset += length;
+		}
+
+		const numOfPictureParameterSets = view.getUint8(offset++);
+
+		// Read PPS
+		const pictureParameterSets: Uint8Array[] = [];
+		for (let i = 0; i < numOfPictureParameterSets; i++) {
+			const length = view.getUint16(offset, false);
+			offset += 2;
+
+			pictureParameterSets.push(data.subarray(offset, offset + length));
+			offset += length;
+		}
+
+		const record: AvcDecoderConfigurationRecord = {
+			configurationVersion,
+			avcProfileIndication,
+			profileCompatibility,
+			avcLevelIndication,
+			lengthSizeMinusOne,
+			sequenceParameterSets,
+			pictureParameterSets,
+			chromaFormat: null,
+			bitDepthLumaMinus8: null,
+			bitDepthChromaMinus8: null,
+			sequenceParameterSetExt: null,
+		};
+
+		// Check if there are extended profile fields
+		if (
+			(
+				avcProfileIndication === 100
+				|| avcProfileIndication === 110
+				|| avcProfileIndication === 122
+				|| avcProfileIndication === 144
+			)
+			&& offset + 4 <= data.length
+		) {
+			const chromaFormat = view.getUint8(offset++) & 0x03;
+			const bitDepthLumaMinus8 = view.getUint8(offset++) & 0x07;
+			const bitDepthChromaMinus8 = view.getUint8(offset++) & 0x07;
+			const numOfSequenceParameterSetExt = view.getUint8(offset++);
+
+			record.chromaFormat = chromaFormat;
+			record.bitDepthLumaMinus8 = bitDepthLumaMinus8;
+			record.bitDepthChromaMinus8 = bitDepthChromaMinus8;
+
+			// Read SPS Ext
+			const sequenceParameterSetExt: Uint8Array[] = [];
+			for (let i = 0; i < numOfSequenceParameterSetExt; i++) {
+				const length = view.getUint16(offset, false);
+				offset += 2;
+
+				sequenceParameterSetExt.push(data.subarray(offset, offset + length));
+				offset += length;
+			}
+
+			record.sequenceParameterSetExt = sequenceParameterSetExt;
+		}
+
+		return record;
+	} catch (error) {
+		console.error('Error deserializing AVC Decoder Configuration Record:', error);
+		return null;
+	}
+};
+
+export type AvcSpsInfo = {
+	profileIdc: number;
+	constraintFlags: number;
+	levelIdc: number;
+	frameMbsOnlyFlag: number;
+	chromaFormatIdc: number | null;
+	bitDepthLumaMinus8: number | null;
+	bitDepthChromaMinus8: number | null;
+};
+
+/** Parses an AVC SPS (Sequence Parameter Set) to extract basic information. */
+export const parseAvcSps = (sps: Uint8Array): AvcSpsInfo | null => {
+	try {
+		const bitstream = new Bitstream(removeEmulationPreventionBytes(sps));
+
+		bitstream.skipBits(1); // forbidden_zero_bit
+		bitstream.skipBits(2); // nal_ref_idc
+		const nalUnitType = bitstream.readBits(5);
+
+		if (nalUnitType !== 7) { // SPS NAL unit type is 7
+			return null;
+		}
+
+		const profileIdc = bitstream.readAlignedByte();
+		const constraintFlags = bitstream.readAlignedByte();
+		const levelIdc = bitstream.readAlignedByte();
+
+		readExpGolomb(bitstream); // seq_parameter_set_id
+
+		let chromaFormatIdc: number | null = null;
+		let bitDepthLumaMinus8: number | null = null;
+		let bitDepthChromaMinus8: number | null = null;
+
+		// Handle high profile chroma_format_idc
+		if (
+			profileIdc === 100
+			|| profileIdc === 110
+			|| profileIdc === 122
+			|| profileIdc === 244
+			|| profileIdc === 44
+			|| profileIdc === 83
+			|| profileIdc === 86
+			|| profileIdc === 118
+			|| profileIdc === 128
+		) {
+			chromaFormatIdc = readExpGolomb(bitstream);
+			if (chromaFormatIdc === 3) {
+				bitstream.skipBits(1); // separate_colour_plane_flag
+			}
+			bitDepthLumaMinus8 = readExpGolomb(bitstream);
+			bitDepthChromaMinus8 = readExpGolomb(bitstream);
+			bitstream.skipBits(1); // qpprime_y_zero_transform_bypass_flag
+			const seqScalingMatrixPresentFlag = bitstream.readBits(1);
+			if (seqScalingMatrixPresentFlag) {
+				for (let i = 0; i < (chromaFormatIdc !== 3 ? 8 : 12); i++) {
+					const seqScalingListPresentFlag = bitstream.readBits(1);
+					if (seqScalingListPresentFlag) {
+						const sizeOfScalingList = i < 6 ? 16 : 64;
+						let lastScale = 8;
+						let nextScale = 8;
+						for (let j = 0; j < sizeOfScalingList; j++) {
+							if (nextScale !== 0) {
+								const deltaScale = readSignedExpGolomb(bitstream);
+								nextScale = (lastScale + deltaScale + 256) % 256;
+							}
+							lastScale = nextScale === 0 ? lastScale : nextScale;
+						}
+					}
+				}
+			}
+		}
+
+		readExpGolomb(bitstream); // log2_max_frame_num_minus4
+
+		const picOrderCntType = readExpGolomb(bitstream);
+		if (picOrderCntType === 0) {
+			readExpGolomb(bitstream); // log2_max_pic_order_cnt_lsb_minus4
+		} else if (picOrderCntType === 1) {
+			bitstream.skipBits(1); // delta_pic_order_always_zero_flag
+			readSignedExpGolomb(bitstream); // offset_for_non_ref_pic
+			readSignedExpGolomb(bitstream); // offset_for_top_to_bottom_field
+			const numRefFramesInPicOrderCntCycle = readExpGolomb(bitstream);
+			for (let i = 0; i < numRefFramesInPicOrderCntCycle; i++) {
+				readSignedExpGolomb(bitstream); // offset_for_ref_frame[i]
+			}
+		}
+
+		readExpGolomb(bitstream); // max_num_ref_frames
+		bitstream.skipBits(1); // gaps_in_frame_num_value_allowed_flag
+
+		readExpGolomb(bitstream); // pic_width_in_mbs_minus1
+		readExpGolomb(bitstream); // pic_height_in_map_units_minus1
+
+		const frameMbsOnlyFlag = bitstream.readBits(1);
+
+		return {
+			profileIdc,
+			constraintFlags,
+			levelIdc,
+			frameMbsOnlyFlag,
+			chromaFormatIdc,
+			bitDepthLumaMinus8,
+			bitDepthChromaMinus8,
+		};
+	} catch (error) {
+		console.error('Error parsing AVC SPS:', error);
+		return null;
+	}
+};
+
 // Data specified in ISO 14496-15
 export type HevcDecoderConfigurationRecord = {
 	configurationVersion: number;
@@ -423,9 +625,7 @@ export const extractNalUnitTypeForHevc = (data: Uint8Array) => {
 };
 
 /** Builds a HevcDecoderConfigurationRecord from an HEVC packet in Annex B format. */
-export const extractHevcDecoderConfigurationRecord = (
-	packetData: Uint8Array,
-) => {
+export const extractHevcDecoderConfigurationRecord = (packetData: Uint8Array) => {
 	try {
 		const nalUnits = findNalUnitsInAnnexB(packetData);
 
@@ -1289,6 +1489,69 @@ export const extractAv1CodecInfoFromPacket = (
 			}
 		}
 
+		// Frame size
+		const frameWidthBitsMinus1 = bitstream.readBits(4);
+		const frameHeightBitsMinus1 = bitstream.readBits(4);
+		const n1 = frameWidthBitsMinus1 + 1;
+		bitstream.skipBits(n1); // max_frame_width_minus_1
+		const n2 = frameHeightBitsMinus1 + 1;
+		bitstream.skipBits(n2); // max_frame_height_minus_1
+
+		// Frame IDs
+		let frameIdNumbersPresentFlag = 0;
+		if (reducedStillPictureHeader) {
+			frameIdNumbersPresentFlag = 0;
+		} else {
+			frameIdNumbersPresentFlag = bitstream.readBits(1);
+		}
+
+		if (frameIdNumbersPresentFlag) {
+			bitstream.skipBits(4); // delta_frame_id_length_minus_2
+			bitstream.skipBits(3); // additional_frame_id_length_minus_1
+		}
+
+		bitstream.skipBits(1); // use_128x128_superblock
+		bitstream.skipBits(1); // enable_filter_intra
+		bitstream.skipBits(1); // enable_intra_edge_filter
+
+		if (!reducedStillPictureHeader) {
+			bitstream.skipBits(1); // enable_interintra_compound
+			bitstream.skipBits(1); // enable_masked_compound
+			bitstream.skipBits(1); // enable_warped_motion
+			bitstream.skipBits(1); // enable_dual_filter
+			const enableOrderHint = bitstream.readBits(1);
+
+			if (enableOrderHint) {
+				bitstream.skipBits(1); // enable_jnt_comp
+				bitstream.skipBits(1); // enable_ref_frame_mvs
+			}
+
+			const seqChooseScreenContentTools = bitstream.readBits(1);
+			let seqForceScreenContentTools = 0;
+
+			if (seqChooseScreenContentTools) {
+				seqForceScreenContentTools = 2; // SELECT_SCREEN_CONTENT_TOOLS
+			} else {
+				seqForceScreenContentTools = bitstream.readBits(1);
+			}
+
+			if (seqForceScreenContentTools > 0) {
+				const seqChooseIntegerMv = bitstream.readBits(1);
+				if (!seqChooseIntegerMv) {
+					bitstream.skipBits(1); // seq_force_integer_mv
+				}
+			}
+
+			if (enableOrderHint) {
+				bitstream.skipBits(3); // order_hint_bits_minus_1
+			}
+		}
+
+		bitstream.skipBits(1); // enable_superres
+		bitstream.skipBits(1); // enable_cdef
+		bitstream.skipBits(1); // enable_restoration
+
+		// color_config()
 		const highBitdepth = bitstream.readBits(1);
 
 		let bitDepth = 8;
@@ -1486,7 +1749,68 @@ export const determineVideoPacketType = (
 	switch (codec) {
 		case 'avc': {
 			const nalUnits = extractAvcNalUnits(packetData, decoderConfig);
-			const isKeyframe = nalUnits.some(x => extractNalUnitTypeForAvc(x) === AvcNalUnitType.IDR);
+			let isKeyframe = nalUnits.some(x => extractNalUnitTypeForAvc(x) === AvcNalUnitType.IDR);
+
+			if (!isKeyframe && (!isChromium() || getChromiumVersion()! >= 144)) {
+				// In addition to IDR, Recovery Point SEI also counts as a valid H.264 keyframe by current consensus.
+				// See https://github.com/w3c/webcodecs/issues/650 for the relevant discussion. WebKit and Firefox have
+				// always supported them, but Chromium hasn't, therefore the (admittedly dirty) version check.
+
+				for (const nalUnit of nalUnits) {
+					const type = extractNalUnitTypeForAvc(nalUnit);
+					if (type !== AvcNalUnitType.SEI) {
+						continue;
+					}
+
+					const bytes = removeEmulationPreventionBytes(nalUnit);
+					let pos = 1; // Skip NALU header
+
+					// sei_rbsp()
+					do {
+						// sei_message()
+						let payloadType = 0;
+						while (true) {
+							const nextByte = bytes[pos++];
+							if (nextByte === undefined) break;
+							payloadType += nextByte;
+
+							if (nextByte < 255) {
+								break;
+							}
+						}
+
+						let payloadSize = 0;
+						while (true) {
+							const nextByte = bytes[pos++];
+							if (nextByte === undefined) break;
+							payloadSize += nextByte;
+
+							if (nextByte < 255) {
+								break;
+							}
+						}
+
+						// sei_payload()
+						const PAYLOAD_TYPE_RECOVERY_POINT = 6;
+						if (payloadType === PAYLOAD_TYPE_RECOVERY_POINT) {
+							const bitstream = new Bitstream(bytes);
+							bitstream.pos = 8 * pos;
+
+							const recoveryFrameCount = readExpGolomb(bitstream);
+							const exactMatchFlag = bitstream.readBits(1);
+
+							if (recoveryFrameCount === 0 && exactMatchFlag === 1) {
+								// https://github.com/w3c/webcodecs/pull/910
+								// "recovery_frame_cnt == 0 and exact_match_flag=1 in the SEI recovery payload"
+								isKeyframe = true;
+								break;
+							}
+						}
+
+						pos += payloadSize;
+					} while (pos < bytes.length - 1);
+				}
+			}
 
 			return isKeyframe ? 'key' : 'delta';
 		};
diff --git a/src/codec.ts b/src/codec.ts
index a396e70..b9414fd 100644
--- a/src/codec.ts
+++ b/src/codec.ts
@@ -337,6 +337,7 @@ export const extractVideoCodecString = (trackInfo: {
 	codec: VideoCodec | null;
 	codecDescription: Uint8Array | null;
 	colorSpace: VideoColorSpaceInit | null;
+	avcType: 1 | 3 | null;
 	avcCodecInfo: AvcDecoderConfigurationRecord | null;
 	hevcCodecInfo: HevcDecoderConfigurationRecord | null;
 	vp9CodecInfo: Vp9CodecInfo | null;
@@ -345,6 +346,8 @@ export const extractVideoCodecString = (trackInfo: {
 	const { codec, codecDescription, colorSpace, avcCodecInfo, hevcCodecInfo, vp9CodecInfo, av1CodecInfo } = trackInfo;
 
 	if (codec === 'avc') {
+		assert(trackInfo.avcType !== null);
+
 		if (avcCodecInfo) {
 			const bytes = new Uint8Array([
 				avcCodecInfo.avcProfileIndication,
@@ -352,14 +355,14 @@ export const extractVideoCodecString = (trackInfo: {
 				avcCodecInfo.avcLevelIndication,
 			]);
 
-			return `avc1.${bytesToHexString(bytes)}`;
+			return `avc${trackInfo.avcType}.${bytesToHexString(bytes)}`;
 		}
 
 		if (!codecDescription || codecDescription.byteLength < 4) {
 			throw new TypeError('AVC decoder description is not provided or is not at least 4 bytes long.');
 		}
 
-		return `avc1.${bytesToHexString(codecDescription.subarray(1, 4))}`;
+		return `avc${trackInfo.avcType}.${bytesToHexString(codecDescription.subarray(1, 4))}`;
 	} else if (codec === 'hevc') {
 		let generalProfileSpace: number;
 		let generalProfileIdc: number;
diff --git a/src/conversion.ts b/src/conversion.ts
index 0cabe1a..862b6f0 100644
--- a/src/conversion.ts
+++ b/src/conversion.ts
@@ -48,7 +48,7 @@ import {
 import { Output, TrackType } from './output';
 import { Mp4OutputFormat } from './output-format';
 import { AudioSample, clampCropRectangle, validateCropRectangle, VideoSample } from './sample';
-import { MetadataTags, validateMetadataTags } from './tags';
+import { MetadataTags, validateMetadataTags } from './metadata';
 import { NullTarget } from './target';
 
 /**
@@ -82,10 +82,16 @@ export type ConversionOptions = {
 
 	/** Options to trim the input file. */
 	trim?: {
-		/** The time in the input file in seconds at which the output file should start. Must be less than `end`.  */
-		start: number;
-		/** The time in the input file in seconds at which the output file should end. Must be greater than `start`. */
-		end: number;
+		/**
+		 * The time in the input file in seconds at which the output file should start. Must be less than `end`.
+		 * Defaults to 0 when omitted.
+		 */
+		start?: number;
+		/**
+		 * The time in the input file in seconds at which the output file should end. Must be greater than `start`.
+		 * Defaults to the duration of the input when omitted.
+		 */
+		end?: number;
 	};
 
 	/**
@@ -137,6 +143,12 @@ export type ConversionVideoOptions = {
 	 * This rotation is _in addition to_ the natural rotation of the input video as specified in input file's metadata.
 	 */
 	rotate?: Rotation;
+	/**
+	 * Defaults to `true`. When enabaled, Mediabunny will use the rotation metadata in the output file to perform video
+	 * rotation whenever possible. Set this field to `false` if you want to ensure the output file does not make use of
+	 * rotation metadata and that any rotation is baked into the video frames directly.
+	 */
+	allowRotationMetadata?: boolean;
 	/**
 	 * Specifies the rectangular region of the input video to crop to. The crop region will automatically be clamped to
 	 * the dimensions of the input video track. Cropping is performed after rotation but before resizing.
@@ -174,6 +186,11 @@ export type ConversionVideoOptions = {
 	 * Setting this fields forces a transcode.
 	 */
 	keyFrameInterval?: number;
+	/**
+	 * A hint that configures the hardware acceleration method used when transcoding. This is best left on
+	 * `'no-preference'`, the default.
+	 */
+	hardwareAcceleration?: 'no-preference' | 'prefer-hardware' | 'prefer-software';
 	/** When `true`, video will always be re-encoded instead of directly copying over the encoded samples. */
 	forceTranscode?: boolean;
 	/**
@@ -298,6 +315,9 @@ const validateVideoOptions = (videoOptions: ConversionVideoOptions | undefined)
 	if (videoOptions?.rotate !== undefined && ![0, 90, 180, 270].includes(videoOptions.rotate)) {
 		throw new TypeError('options.video.rotate, when provided, must be 0, 90, 180 or 270.');
 	}
+	if (videoOptions?.allowRotationMetadata !== undefined && typeof videoOptions.allowRotationMetadata !== 'boolean') {
+		throw new TypeError('options.video.allowRotationMetadata, when provided, must be a boolean.');
+	}
 	if (videoOptions?.crop !== undefined) {
 		validateCropRectangle(videoOptions.crop, 'options.video.');
 	}
@@ -331,6 +351,15 @@ const validateVideoOptions = (videoOptions: ConversionVideoOptions | undefined)
 	) {
 		throw new TypeError('options.video.processedHeight, when provided, must be a positive integer.');
 	}
+	if (
+		videoOptions?.hardwareAcceleration !== undefined
+		&& !['no-preference', 'prefer-hardware', 'prefer-software'].includes(videoOptions.hardwareAcceleration)
+	) {
+		throw new TypeError(
+			'options.video.hardwareAcceleration, when provided, must be \'no-preference\', \'prefer-hardware\' or'
+			+ ' \'prefer-software\'.',
+		);
+	}
 };
 
 const validateAudioOptions = (audioOptions: ConversionAudioOptions | undefined) => {
@@ -832,7 +861,8 @@ export class Conversion {
 		let videoSource: VideoSource;
 
 		const totalRotation = normalizeRotation(track.rotation + (trackOptions.rotate ?? 0));
-		const outputSupportsRotation = this.output.format.supportsVideoRotationMetadata;
+		const canUseRotationMetadata = this.output.format.supportsVideoRotationMetadata
+			&& (trackOptions.allowRotationMetadata ?? true);
 
 		const [rotatedWidth, rotatedHeight] = totalRotation % 180 === 0
 			? [track.codedWidth, track.codedHeight]
@@ -877,7 +907,7 @@ export class Conversion {
 			// TODO This is suboptimal: Forcing a rerender when both rotation and process are set is not
 			// performance-optimal, but right now there's no other way because we can't change the track rotation
 			// metadata after the output has already started. Should be possible with API changes in v2, though!
-			|| (totalRotation !== 0 && (!outputSupportsRotation || trackOptions.process !== undefined))
+			|| (totalRotation !== 0 && (!canUseRotationMetadata || trackOptions.process !== undefined))
 			|| !!crop;
 
 		const alpha = trackOptions.alpha ?? 'discard';
@@ -968,6 +998,7 @@ export class Conversion {
 				keyFrameInterval: trackOptions.keyFrameInterval,
 				sizeChangeBehavior: trackOptions.fit ?? 'passThrough',
 				alpha,
+				hardwareAcceleration: trackOptions.hardwareAcceleration,
 			};
 
 			const source = new VideoSampleSource(encodingConfig);
@@ -1043,6 +1074,7 @@ export class Conversion {
 								duration: 1 / frameRate,
 							});
 							await this._registerVideoSample(track, trackOptions, source, sample);
+							sample.close();
 						}
 					};
 
@@ -1079,12 +1111,11 @@ export class Conversion {
 							duration: frameRate !== undefined ? 1 / frameRate : duration,
 						});
 						await this._registerVideoSample(track, trackOptions, source, sample);
+						sample.close();
 
 						if (frameRate !== undefined) {
 							lastCanvas = canvas;
 							lastCanvasTimestamp = adjustedSampleTimestamp;
-						} else {
-							sample.close();
 						}
 					}
 
@@ -1184,9 +1215,10 @@ export class Conversion {
 
 		this.output.addVideoTrack(videoSource, {
 			frameRate: trackOptions.frameRate,
-			// TEMP: This condition can be removed when all demuxers properly homogenize to BCP47 in v2
+			// TODO: This condition can be removed when all demuxers properly homogenize to BCP47 in v2
 			languageCode: isIso639Dash2LanguageCode(track.languageCode) ? track.languageCode : undefined,
 			name: track.name ?? undefined,
+			disposition: track.disposition,
 			rotation: needsRerender ? 0 : totalRotation, // Rerendering will bake the rotation into the output
 		});
 		this._addedCounts.video++;
@@ -1423,9 +1455,10 @@ export class Conversion {
 		}
 
 		this.output.addAudioTrack(audioSource, {
-			// TEMP: This condition can be removed when all demuxers properly homogenize to BCP47 in v2
+			// TODO: This condition can be removed when all demuxers properly homogenize to BCP47 in v2
 			languageCode: isIso639Dash2LanguageCode(track.languageCode) ? track.languageCode : undefined,
 			name: track.name ?? undefined,
+			disposition: track.disposition,
 		});
 		this._addedCounts.audio++;
 		this._totalTrackCount++;
@@ -1507,7 +1540,10 @@ export class Conversion {
 				targetSampleRate,
 				startTime: this._startTimestamp,
 				endTime: this._endTimestamp,
-				onSample: sample => this._registerAudioSample(track, trackOptions, source, sample),
+				onSample: async (sample) => {
+					await this._registerAudioSample(track, trackOptions, source, sample);
+					sample.close();
+				},
 			});
 
 			const sink = new AudioSampleSink(track);
@@ -1519,6 +1555,7 @@ export class Conversion {
 				}
 
 				await resampler.add(sample);
+				sample.close();
 			}
 
 			await resampler.finalize();
diff --git a/src/demuxer.ts b/src/demuxer.ts
index f654dab..5b53fb2 100644
--- a/src/demuxer.ts
+++ b/src/demuxer.ts
@@ -8,7 +8,7 @@
 
 import { Input } from './input';
 import { InputTrack } from './input-track';
-import { MetadataTags } from './tags';
+import { MetadataTags } from './metadata';
 
 export abstract class Demuxer {
 	input: Input;
diff --git a/src/encode.ts b/src/encode.ts
index bf7834b..9f07a69 100644
--- a/src/encode.ts
+++ b/src/encode.ts
@@ -22,6 +22,7 @@ import {
 	VideoCodec,
 } from './codec';
 import { customAudioEncoders, customVideoEncoders } from './custom-coder';
+import { isFirefox } from './misc';
 import { EncodedPacket } from './packet';
 
 /**
@@ -115,9 +116,15 @@ export type VideoEncodingAdditionalOptions = {
 	 * format that supports transparency (such as WebM or Matroska).
 	 */
 	alpha?: 'discard' | 'keep';
-	/** Configures the bitrate mode. */
+	/** Configures the bitrate mode; defaults to `'variable'`. */
 	bitrateMode?: 'constant' | 'variable';
-	/** The latency mode used by the encoder; controls the performance-quality tradeoff. */
+	/**
+	 * The latency mode used by the encoder; controls the performance-quality tradeoff.
+	 *
+	 * - `'quality'` (default): The encoder prioritizes quality over latency, and no frames can be dropped.
+	 * - `'realtime'`: The encoder prioritizes low latency over quality, and may drop frames if the encoder becomes
+	 * overloaded to keep up with real-time requirements.
+	 */
 	latencyMode?: 'quality' | 'realtime';
 	/**
 	 * The full codec string as specified in the WebCodecs Codec Registry. This string must match the codec
@@ -125,7 +132,8 @@ export type VideoEncodingAdditionalOptions = {
 	 */
 	fullCodecString?: string;
 	/**
-	 * A hint that configures the hardware acceleration method of this codec. This is best left on `'no-preference'`.
+	 * A hint that configures the hardware acceleration method of this codec. This is best left on `'no-preference'`,
+	 * the default.
 	 */
 	hardwareAcceleration?: 'no-preference' | 'prefer-hardware' | 'prefer-software';
 	/**
@@ -403,31 +411,31 @@ export class Quality {
  * @group Encoding
  * @public
  */
-export const QUALITY_VERY_LOW = new Quality(0.3);
+export const QUALITY_VERY_LOW = /* #__PURE__ */ new Quality(0.3);
 /**
  * Represents a low media quality.
  * @group Encoding
  * @public
  */
-export const QUALITY_LOW = new Quality(0.6);
+export const QUALITY_LOW = /* #__PURE__ */ new Quality(0.6);
 /**
  * Represents a medium media quality.
  * @group Encoding
  * @public
  */
-export const QUALITY_MEDIUM = new Quality(1);
+export const QUALITY_MEDIUM = /* #__PURE__ */ new Quality(1);
 /**
  * Represents a high media quality.
  * @group Encoding
  * @public
  */
-export const QUALITY_HIGH = new Quality(2);
+export const QUALITY_HIGH = /* #__PURE__ */ new Quality(2);
 /**
  * Represents a very high media quality.
  * @group Encoding
  * @public
  */
-export const QUALITY_VERY_HIGH = new Quality(4);
+export const QUALITY_VERY_HIGH = /* #__PURE__ */ new Quality(4);
 
 /**
  * Checks if the browser is able to encode the given codec.
@@ -522,7 +530,45 @@ export const canEncodeVideo = async (
 	});
 
 	const support = await VideoEncoder.isConfigSupported(encoderConfig);
-	return support.supported === true;
+	if (!support.supported) {
+		return false;
+	}
+
+	if (isFirefox()) {
+		// isConfigSupported on Firefox appears to unreliably indicate if encoding will actually succeed. Therefore, we
+		// just try encoding a frame to see if it actually works.
+		// https://github.com/Vanilagy/mediabunny/issues/222
+
+		// eslint-disable-next-line @typescript-eslint/no-misused-promises, no-async-promise-executor
+		return new Promise<boolean>(async (resolve) => {
+			try {
+				const encoder = new VideoEncoder({
+					output: () => {},
+					error: () => resolve(false),
+				});
+				encoder.configure(encoderConfig);
+
+				const frameData = new Uint8Array(width * height * 4);
+				const frame = new VideoFrame(frameData, {
+					format: 'RGBA',
+					codedWidth: width,
+					codedHeight: height,
+					timestamp: 0,
+				});
+
+				encoder.encode(frame);
+				frame.close();
+
+				await encoder.flush();
+
+				resolve(true);
+			} catch {
+				resolve(false);
+			}
+		});
+	} else {
+		return true;
+	}
 };
 
 /**
diff --git a/src/flac/flac-demuxer.ts b/src/flac/flac-demuxer.ts
index 5248394..e362f44 100644
--- a/src/flac/flac-demuxer.ts
+++ b/src/flac/flac-demuxer.ts
@@ -28,7 +28,7 @@ import {
 	readU32Be,
 	readU8,
 } from '../reader';
-import { MetadataTags } from '../tags';
+import { DEFAULT_TRACK_DISPOSITION, MetadataTags } from '../metadata';
 import {
 	calculateCrc8,
 	readBlockSize,
@@ -328,11 +328,13 @@ export class FlacDemuxer extends Demuxer {
 
 			const nextByte = readU8(slice);
 			if (nextByte === 0xff) {
+				const positionBeforeReading = slice.filePos;
+
 				const byteAfterNextByte = readU8(slice);
 
 				const expected = this.blockingBit === 1 ? 0b1111_1001 : 0b1111_1000;
 				if (byteAfterNextByte !== expected) {
-					slice.skip(-1);
+					slice.filePos = positionBeforeReading;
 					continue;
 				}
 
@@ -345,7 +347,7 @@ export class FlacDemuxer extends Demuxer {
 				});
 
 				if (!nextFrameHeader) {
-					slice.skip(-1);
+					slice.filePos = positionBeforeReading;
 					continue;
 				}
 
@@ -355,14 +357,14 @@ export class FlacDemuxer extends Demuxer {
 				if (this.blockingBit === 0) {
 					// Case A: If the stream is fixed block size, this is the frame number, which increments by 1
 					if (nextFrameHeader.num - frameHeader.num !== 1) {
-						slice.skip(-1);
+						slice.filePos = positionBeforeReading;
 						continue;
 					}
 				} else {
 					// Case B: If the stream is variable block size, this is the sample number, which increments by
 					// amount of samples in a frame.
 					if (nextFrameHeader.num - frameHeader.num !== frameHeader.blockSize) {
-						slice.skip(-1);
+						slice.filePos = positionBeforeReading;
 						continue;
 					}
 				}
@@ -563,6 +565,12 @@ class FlacAudioTrackBacking implements InputAudioTrackBacking {
 		return this.demuxer.audioInfo.sampleRate;
 	}
 
+	getDisposition() {
+		return {
+			...DEFAULT_TRACK_DISPOSITION,
+		};
+	}
+
 	async getFirstTimestamp() {
 		return 0;
 	}
diff --git a/src/flac/flac-muxer.ts b/src/flac/flac-muxer.ts
index fdda1d0..b444f0b 100644
--- a/src/flac/flac-muxer.ts
+++ b/src/flac/flac-muxer.ts
@@ -20,7 +20,7 @@ import { Output, OutputAudioTrack } from '../output';
 import { FlacOutputFormat } from '../output-format';
 import { EncodedPacket } from '../packet';
 import { FileSlice, readBytes } from '../reader';
-import { AttachedImage, metadataTagsAreEmpty } from '../tags';
+import { AttachedImage, metadataTagsAreEmpty } from '../metadata';
 import { Writer } from '../writer';
 import {
 	readBlockSize,
@@ -28,7 +28,7 @@ import {
 	readCodedNumber,
 } from './flac-misc';
 
-const FLAC_HEADER = new Uint8Array([0x66, 0x4c, 0x61, 0x43]); // 'fLaC'
+const FLAC_HEADER = /* #__PURE__ */ new Uint8Array([0x66, 0x4c, 0x61, 0x43]); // 'fLaC'
 const STREAMINFO_SIZE = 38;
 const STREAMINFO_BLOCK_SIZE = 34;
 
diff --git a/src/id3.ts b/src/id3.ts
index f231176..15db50b 100644
--- a/src/id3.ts
+++ b/src/id3.ts
@@ -7,7 +7,7 @@
  */
 
 import { decodeSynchsafe, encodeSynchsafe } from '../shared/mp3-misc';
-import { MetadataTags } from './tags';
+import { MetadataTags } from './metadata';
 import {
 	coalesceIndex,
 	textDecoder,
diff --git a/src/index.ts b/src/index.ts
index e3abe7a..6cd723f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -168,7 +168,10 @@ export {
 	AudioSampleCopyToOptions,
 	VideoSample,
 	VideoSampleInit,
+	VideoSamplePixelFormat,
+	VideoSampleColorSpace,
 	CropRectangle,
+	VIDEO_SAMPLE_PIXEL_FORMATS,
 } from './sample';
 export {
 	AudioBufferSink,
@@ -202,6 +205,7 @@ export {
 	AttachedImage,
 	RichImageData,
 	AttachedFile,
-} from './tags';
+	TrackDisposition,
+} from './metadata';
 
 // 🐡🦔
diff --git a/src/input-format.ts b/src/input-format.ts
index ed57825..1748f27 100644
--- a/src/input-format.ts
+++ b/src/input-format.ts
@@ -481,56 +481,56 @@ export class AdtsInputFormat extends InputFormat {
  * @group Input formats
  * @public
  */
-export const MP4 = new Mp4InputFormat();
+export const MP4 = /* #__PURE__ */ new Mp4InputFormat();
 /**
  * QuickTime File Format input format singleton.
  * @group Input formats
  * @public
  */
-export const QTFF = new QuickTimeInputFormat();
+export const QTFF = /* #__PURE__ */ new QuickTimeInputFormat();
 /**
  * Matroska input format singleton.
  * @group Input formats
  * @public
  */
-export const MATROSKA = new MatroskaInputFormat();
+export const MATROSKA = /* #__PURE__ */ new MatroskaInputFormat();
 /**
  * WebM input format singleton.
  * @group Input formats
  * @public
  */
-export const WEBM = new WebMInputFormat();
+export const WEBM = /* #__PURE__ */ new WebMInputFormat();
 /**
  * MP3 input format singleton.
  * @group Input formats
  * @public
  */
-export const MP3 = new Mp3InputFormat();
+export const MP3 = /* #__PURE__ */ new Mp3InputFormat();
 /**
  * WAVE input format singleton.
  * @group Input formats
  * @public
  */
-export const WAVE = new WaveInputFormat();
+export const WAVE = /* #__PURE__ */ new WaveInputFormat();
 /**
  * Ogg input format singleton.
  * @group Input formats
  * @public
  */
-export const OGG = new OggInputFormat();
+export const OGG = /* #__PURE__ */ new OggInputFormat();
 /**
  * ADTS input format singleton.
  * @group Input formats
  * @public
  */
-export const ADTS = new AdtsInputFormat();
+export const ADTS = /* #__PURE__ */ new AdtsInputFormat();
 
 /**
  * FLAC input format singleton.
  * @group Input formats
  * @public
  */
-export const FLAC = new FlacInputFormat();
+export const FLAC = /* #__PURE__ */ new FlacInputFormat();
 
 /**
  * List of all input format singletons. If you don't need to support all input formats, you should specify the
diff --git a/src/input-track.ts b/src/input-track.ts
index 25b5100..8c137fc 100644
--- a/src/input-track.ts
+++ b/src/input-track.ts
@@ -14,6 +14,7 @@ import { EncodedPacketSink, PacketRetrievalOptions } from './media-sink';
 import { assert, Rotation } from './misc';
 import { TrackType } from './output';
 import { EncodedPacket, PacketType } from './packet';
+import { TrackDisposition } from './metadata';
 
 /**
  * Contains aggregate statistics about the encoded packets of a track.
@@ -36,6 +37,7 @@ export interface InputTrackBacking {
 	getName(): string | null;
 	getLanguageCode(): string;
 	getTimeResolution(): number;
+	getDisposition(): TrackDisposition;
 	getFirstTimestamp(): Promise<number>;
 	computeDuration(): Promise<number>;
 
@@ -128,6 +130,11 @@ export abstract class InputTrack {
 		return this._backing.getTimeResolution();
 	}
 
+	/** The track's disposition, i.e. information about its intended usage. */
+	get disposition() {
+		return this._backing.getDisposition();
+	}
+
 	/**
 	 * Returns the start timestamp of the first packet of this track, in seconds. While often near zero, this value
 	 * may be positive or even negative. A negative starting timestamp means the track's timing has been offset. Samples
diff --git a/src/isobmff/isobmff-boxes.ts b/src/isobmff/isobmff-boxes.ts
index 96900d0..0079451 100644
--- a/src/isobmff/isobmff-boxes.ts
+++ b/src/isobmff/isobmff-boxes.ts
@@ -44,7 +44,7 @@ import {
 	Sample,
 } from './isobmff-muxer';
 import { parseOpusIdentificationHeader } from '../codec-data';
-import { MetadataTags, RichImageData } from '../tags';
+import { MetadataTags, RichImageData } from '../metadata';
 
 export class IsobmffBoxWriter {
 	private helper = new Uint8Array(8);
@@ -135,8 +135,8 @@ export class IsobmffBoxWriter {
 	}
 }
 
-const bytes = new Uint8Array(8);
-const view = new DataView(bytes.buffer);
+const bytes = /* #__PURE__ */ new Uint8Array(8);
+const view = /* #__PURE__ */ new DataView(bytes.buffer);
 
 const u8 = (value: number) => {
 	return [(value % 0x100 + 0x100) % 0x100];
@@ -243,7 +243,7 @@ const rotationMatrix = (rotationInDegrees: number): TransformationMatrix => {
 		0, 0, 1,
 	];
 };
-const IDENTITY_MATRIX = rotationMatrix(0);
+const IDENTITY_MATRIX = /* #__PURE__ */ rotationMatrix(0);
 
 const matrixToBytes = (matrix: TransformationMatrix) => {
 	return [
@@ -421,7 +421,12 @@ export const tkhd = (
 		matrix = IDENTITY_MATRIX;
 	}
 
-	return fullBox('tkhd', +needsU64, 3, [
+	let flags = 0x2; // Track in movie
+	if (trackData.track.metadata.disposition?.default !== false) {
+		flags |= 0x1; // Track enabled
+	}
+
+	return fullBox('tkhd', +needsU64, flags, [
 		u32OrU64(creationTime), // Creation time
 		u32OrU64(creationTime), // Modification time
 		u32(trackData.track.id), // Track ID
@@ -577,7 +582,7 @@ export const stsd = (trackData: IsobmffTrackData) => {
 
 	if (trackData.type === 'video') {
 		sampleDescription = videoSampleDescription(
-			VIDEO_CODEC_TO_BOX_NAME[trackData.track.source._codec],
+			videoCodecToBoxName(trackData.track.source._codec, trackData.info.decoderConfig.codec),
 			trackData,
 		);
 	} else if (trackData.type === 'audio') {
@@ -845,7 +850,7 @@ export const dOps = (trackData: IsobmffAudioTrackData) => {
 	let inputSampleRate = trackData.info.sampleRate;
 	let outputGain = 0;
 	let channelMappingFamily = 0;
-	let channelMappingTable = new Uint8Array(0);
+	let channelMappingTable: Uint8Array<ArrayBufferLike> = new Uint8Array(0);
 
 	// Read preskip and from codec private data from the encoder
 	// https://www.rfc-editor.org/rfc/rfc7845#section-5
@@ -1572,12 +1577,14 @@ const dataStringBoxLong = (value: string) => {
 	]);
 };
 
-const VIDEO_CODEC_TO_BOX_NAME: Record<VideoCodec, string> = {
-	avc: 'avc1',
-	hevc: 'hvc1',
-	vp8: 'vp08',
-	vp9: 'vp09',
-	av1: 'av01',
+const videoCodecToBoxName = (codec: VideoCodec, fullCodecString: string) => {
+	switch (codec) {
+		case 'avc': return fullCodecString.startsWith('avc3') ? 'avc3' : 'avc1';
+		case 'hevc': return 'hvc1';
+		case 'vp8': return 'vp08';
+		case 'vp9': return 'vp09';
+		case 'av1': return 'av01';
+	}
 };
 
 const VIDEO_CODEC_TO_CONFIGURATION_BOX: Record<VideoCodec, (trackData: IsobmffVideoTrackData) => Box | null> = {
diff --git a/src/isobmff/isobmff-demuxer.ts b/src/isobmff/isobmff-demuxer.ts
index e1d047c..b524bb2 100644
--- a/src/isobmff/isobmff-demuxer.ts
+++ b/src/isobmff/isobmff-demuxer.ts
@@ -51,13 +51,13 @@ import {
 	MATRIX_COEFFICIENTS_MAP_INVERSE,
 	normalizeRotation,
 	roundToMultiple,
-	roundToPrecision,
 	Rotation,
 	textDecoder,
 	TransformationMatrix,
 	TRANSFER_CHARACTERISTICS_MAP_INVERSE,
 	UNDETERMINED_LANGUAGE,
 	toDataView,
+	roundIfAlmostInteger,
 } from '../misc';
 import { EncodedPacket, PLACEHOLDER_DATA } from '../packet';
 import { buildIsobmffMimeType } from './isobmff-misc';
@@ -86,12 +86,13 @@ import {
 	readU8,
 	readAscii,
 } from '../reader';
-import { MetadataTags, RichImageData } from '../tags';
+import { DEFAULT_TRACK_DISPOSITION, MetadataTags, RichImageData, TrackDisposition } from '../metadata';
 
 type InternalTrack = {
 	id: number;
 	demuxer: IsobmffDemuxer;
 	inputTrack: InputTrack | null;
+	disposition: TrackDisposition;
 	timescale: number;
 	durationInMovieTimescale: number;
 	durationInMediaTimescale: number;
@@ -126,6 +127,7 @@ type InternalTrack = {
 		codec: VideoCodec | null;
 		codecDescription: Uint8Array | null;
 		colorSpace: VideoColorSpaceInit | null;
+		avcType: 1 | 3 | null;
 		avcCodecInfo: AvcDecoderConfigurationRecord | null;
 		hevcCodecInfo: HevcDecoderConfigurationRecord | null;
 		vp9CodecInfo: Vp9CodecInfo | null;
@@ -314,6 +316,9 @@ export class IsobmffDemuxer extends Demuxer {
 					this.moovSlice = moovSlice;
 					this.readContiguousBoxes(this.moovSlice);
 
+					// Put default tracks first
+					this.tracks.sort((a, b) => Number(b.disposition.default) - Number(a.disposition.default));
+
 					for (const track of this.tracks) {
 						// Modify the edit list offset based on the previous segment durations. They are in different
 						// timescales, so we first convert to seconds and then into the track timescale.
@@ -650,6 +655,9 @@ export class IsobmffDemuxer extends Demuxer {
 					id: -1,
 					demuxer: this,
 					inputTrack: null,
+					disposition: {
+						...DEFAULT_TRACK_DISPOSITION,
+					},
 					info: null,
 					timescale: -1,
 					durationInMovieTimescale: -1,
@@ -694,10 +702,10 @@ export class IsobmffDemuxer extends Demuxer {
 				const version = readU8(slice);
 				const flags = readU24Be(slice);
 
-				const trackEnabled = (flags & 0x1) !== 0;
-				if (!trackEnabled) {
-					break;
-				}
+				// Spec says disabled tracks are to be treated like they don't exist, but in practice, they are treated
+				// more like non-default tracks.
+				const trackEnabled = !!(flags & 0x1);
+				track.disposition.default = trackEnabled;
 
 				// Skip over creation & modification time to reach the track ID
 				if (version === 0) {
@@ -836,6 +844,7 @@ export class IsobmffDemuxer extends Demuxer {
 						codec: null,
 						codecDescription: null,
 						colorSpace: null,
+						avcType: null,
 						avcCodecInfo: null,
 						hevcCodecInfo: null,
 						vp9CodecInfo: null,
@@ -890,8 +899,9 @@ export class IsobmffDemuxer extends Demuxer {
 					const lowercaseBoxName = sampleBoxInfo.name.toLowerCase();
 
 					if (track.info.type === 'video') {
-						if (lowercaseBoxName === 'avc1') {
+						if (lowercaseBoxName === 'avc1' || lowercaseBoxName === 'avc3') {
 							track.info.codec = 'avc';
+							track.info.avcType = lowercaseBoxName === 'avc1' ? 1 : 3;
 						} else if (lowercaseBoxName === 'hvc1' || lowercaseBoxName === 'hev1') {
 							track.info.codec = 'hevc';
 						} else if (lowercaseBoxName === 'vp08') {
@@ -2342,6 +2352,10 @@ abstract class IsobmffTrackBacking implements InputTrackBacking {
 		return this.internalTrack.timescale;
 	}
 
+	getDisposition() {
+		return this.internalTrack.disposition;
+	}
+
 	async computeDuration() {
 		const lastPacket = await this.getPacket(Infinity, { metadataOnly: true });
 		return (lastPacket?.timestamp ?? 0) + (lastPacket?.duration ?? 0);
@@ -2385,7 +2399,7 @@ abstract class IsobmffTrackBacking implements InputTrackBacking {
 		// Do a little rounding to catch cases where the result is very close to an integer. If it is, it's likely
 		// that the number was originally an integer divided by the timescale. For stability, it's best
 		// to return the integer in this case.
-		return roundToPrecision(timestamp * this.internalTrack.timescale, 14) + this.internalTrack.editListOffset;
+		return roundIfAlmostInteger(timestamp * this.internalTrack.timescale) + this.internalTrack.editListOffset;
 	}
 
 	async getPacket(timestamp: number, options: PacketRetrievalOptions) {
@@ -2475,11 +2489,8 @@ abstract class IsobmffTrackBacking implements InputTrackBacking {
 		const timestampInTimescale = this.mapTimestampIntoTimescale(timestamp);
 
 		const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
-		const sampleIndex = getSampleIndexForTimestamp(sampleTable, timestampInTimescale);
-		const keyFrameSampleIndex = sampleIndex === -1
-			? -1
-			: getRelevantKeyframeIndexForSample(sampleTable, sampleIndex);
-		const regularPacket = await this.fetchPacketForSampleIndex(keyFrameSampleIndex, options);
+		const sampleIndex = getKeyframeSampleIndexForTimestamp(sampleTable, timestampInTimescale);
+		const regularPacket = await this.fetchPacketForSampleIndex(sampleIndex, options);
 
 		if (!sampleTableIsEmpty(sampleTable) || !this.internalTrack.demuxer.isFragmented) {
 			// Prefer the non-fragmented packet
@@ -2899,7 +2910,45 @@ const getSampleIndexForTimestamp = (sampleTable: SampleTable, timescaleUnits: nu
 
 		const entry = sampleTable.sampleTimingEntries[index]!;
 		return entry.startIndex
-			+ Math.min(Math.floor((timescaleUnits - entry.startDecodeTimestamp) / entry.delta), entry.count - 1);
+			+ Math.min(
+				Math.floor((timescaleUnits - entry.startDecodeTimestamp) / entry.delta),
+				entry.count - 1,
+			);
+	}
+};
+
+const getKeyframeSampleIndexForTimestamp = (sampleTable: SampleTable, timescaleUnits: number) => {
+	if (!sampleTable.keySampleIndices) {
+		// Every sample is a keyframe
+		return getSampleIndexForTimestamp(sampleTable, timescaleUnits);
+	}
+
+	if (sampleTable.presentationTimestamps) {
+		const index = binarySearchLessOrEqual(
+			sampleTable.presentationTimestamps,
+			timescaleUnits,
+			x => x.presentationTimestamp,
+		);
+		if (index === -1) {
+			return -1;
+		}
+
+		// Walk the samples in presentation order until we find one that's a keyframe
+		for (let i = index; i >= 0; i--) {
+			const sampleIndex = sampleTable.presentationTimestamps[i]!.sampleIndex;
+			const isKeyFrame = binarySearchExact(sampleTable.keySampleIndices, sampleIndex, x => x) !== -1;
+
+			if (isKeyFrame) {
+				return sampleIndex;
+			}
+		}
+
+		return -1;
+	} else {
+		const sampleIndex = getSampleIndexForTimestamp(sampleTable, timescaleUnits);
+
+		const index = binarySearchLessOrEqual(sampleTable.keySampleIndices, sampleIndex, x => x);
+		return sampleTable.keySampleIndices[index] ?? -1;
 	}
 };
 
@@ -2988,15 +3037,6 @@ const getSampleInfo = (sampleTable: SampleTable, sampleIndex: number): SampleInf
 	};
 };
 
-const getRelevantKeyframeIndexForSample = (sampleTable: SampleTable, sampleIndex: number) => {
-	if (!sampleTable.keySampleIndices) {
-		return sampleIndex;
-	}
-
-	const index = binarySearchLessOrEqual(sampleTable.keySampleIndices, sampleIndex, x => x);
-	return sampleTable.keySampleIndices[index] ?? -1;
-};
-
 const getNextKeyframeIndexForSample = (sampleTable: SampleTable, sampleIndex: number) => {
 	if (!sampleTable.keySampleIndices) {
 		return sampleIndex + 1;
diff --git a/src/isobmff/isobmff-muxer.ts b/src/isobmff/isobmff-muxer.ts
index e866f9d..fd73b50 100644
--- a/src/isobmff/isobmff-muxer.ts
+++ b/src/isobmff/isobmff-muxer.ts
@@ -25,11 +25,12 @@ import {
 import { BufferTarget } from '../target';
 import { EncodedPacket, PacketType } from '../packet';
 import {
+	concatNalUnitsInLengthPrefixed,
 	extractAvcDecoderConfigurationRecord,
 	extractHevcDecoderConfigurationRecord,
+	findNalUnitsInAnnexB,
 	serializeAvcDecoderConfigurationRecord,
 	serializeHevcDecoderConfigurationRecord,
-	transformAnnexBToLengthPrefixed,
 } from '../codec-data';
 import { buildIsobmffMimeType } from './isobmff-misc';
 import { MAX_BOX_HEADER_SIZE, MIN_BOX_HEADER_SIZE } from './isobmff-reader';
@@ -464,15 +465,18 @@ export class IsobmffMuxer extends Muxer {
 
 			let packetData = packet.data;
 			if (trackData.info.requiresAnnexBTransformation) {
-				const transformedData = transformAnnexBToLengthPrefixed(packetData);
-				if (!transformedData) {
+				const nalUnits = findNalUnitsInAnnexB(packetData);
+				if (nalUnits.length === 0) {
+					// It's not valid Annex B data
 					throw new Error(
 						'Failed to transform packet data. Make sure all packets are provided in Annex B format, as'
 						+ ' specified in ITU-T-REC-H.264 and ITU-T-REC-H.265.',
 					);
 				}
 
-				packetData = transformedData;
+				// We don't strip things like SPS or PPS NALUs here, mainly because they can also appear in the middle
+				// of a stream and potentially modify the parameters of it. So, let's just leave them in to be sure.
+				packetData = concatNalUnitsInLengthPrefixed(nalUnits, 4);
 			}
 
 			const timestamp = this.validateAndNormalizeTimestamp(
diff --git a/src/isobmff/isobmff-reader.ts b/src/isobmff/isobmff-reader.ts
index 67e0ab8..2579fc9 100644
--- a/src/isobmff/isobmff-reader.ts
+++ b/src/isobmff/isobmff-reader.ts
@@ -6,7 +6,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-import { RichImageData } from '../tags';
+import { RichImageData } from '../metadata';
 import { textDecoder } from '../misc';
 import { FileSlice, readAscii, readBytes, readI32Be, readU16Be, readU32Be, readU64Be, readU8 } from '../reader';
 
diff --git a/src/matroska/ebml.ts b/src/matroska/ebml.ts
index 4fc70bd..eb27c40 100644
--- a/src/matroska/ebml.ts
+++ b/src/matroska/ebml.ts
@@ -88,6 +88,10 @@ export enum EBMLId {
 	FlagEnabled = 0xb9,
 	FlagDefault = 0x88,
 	FlagForced = 0x55aa,
+	FlagOriginal = 0x55ae,
+	FlagHearingImpaired = 0x55ab,
+	FlagVisualImpaired = 0x55ac,
+	FlagCommentary = 0x55af,
 	FlagLacing = 0x9c,
 	Name = 0x536e,
 	Language = 0x22b59c,
diff --git a/src/matroska/matroska-demuxer.ts b/src/matroska/matroska-demuxer.ts
index e964bef..db421b6 100644
--- a/src/matroska/matroska-demuxer.ts
+++ b/src/matroska/matroska-demuxer.ts
@@ -31,7 +31,7 @@ import {
 	InputVideoTrack,
 	InputVideoTrackBacking,
 } from '../input-track';
-import { AttachedFile, MetadataTags } from '../tags';
+import { AttachedFile, DEFAULT_TRACK_DISPOSITION, MetadataTags, TrackDisposition } from '../metadata';
 import { PacketRetrievalOptions } from '../media-sink';
 import {
 	assert,
@@ -43,7 +43,7 @@ import {
 	MATRIX_COEFFICIENTS_MAP_INVERSE,
 	normalizeRotation,
 	Rotation,
-	roundToPrecision,
+	roundIfAlmostInteger,
 	TRANSFER_CHARACTERISTICS_MAP_INVERSE,
 	UNDETERMINED_LANGUAGE,
 } from '../misc';
@@ -61,7 +61,6 @@ import {
 	readElementHeader,
 	readElementId,
 	readFloat,
-	readSignedInt,
 	readUnsignedInt,
 	readVarInt,
 	resync,
@@ -137,7 +136,6 @@ type ClusterBlock = {
 	timestamp: number;
 	duration: number;
 	isKeyFrame: boolean;
-	referencedTimestamps: number[];
 	data: Uint8Array;
 	lacing: BlockLacing;
 	decoded: boolean;
@@ -190,7 +188,7 @@ type InternalTrack = {
 	}[];
 	cuePoints: CuePoint[];
 
-	isDefault: boolean;
+	disposition: TrackDisposition;
 	inputTrack: InputTrack | null;
 	codecId: string | null;
 	codecPrivate: Uint8Array | null;
@@ -539,7 +537,7 @@ export class MatroskaDemuxer extends Demuxer {
 		}
 
 		// Put default tracks first
-		this.currentSegment.tracks.sort((a, b) => Number(b.isDefault) - Number(a.isDefault));
+		this.currentSegment.tracks.sort((a, b) => Number(b.disposition.default) - Number(a.disposition.default));
 
 		// Now, let's distribute the cue points to the tracks
 		const idToTrack = new Map(this.currentSegment.tracks.map(x => [x.id, x]));
@@ -649,21 +647,15 @@ export class MatroskaDemuxer extends Demuxer {
 			// This must hold, as track datas only get created if a block for that track is encountered
 			assert(trackData.blocks.length > 0);
 
-			let blockReferencesExist = false;
 			let hasLacedBlocks = false;
 
 			for (let i = 0; i < trackData.blocks.length; i++) {
 				const block = trackData.blocks[i]!;
 				block.timestamp += cluster.timestamp;
 
-				blockReferencesExist ||= block.referencedTimestamps.length > 0;
 				hasLacedBlocks ||= block.lacing !== BlockLacing.None;
 			}
 
-			if (blockReferencesExist) {
-				trackData.blocks = sortBlocksByReferences(trackData.blocks);
-			}
-
 			trackData.presentationTimestamps = trackData.blocks
 				.map((block, i) => ({ timestamp: block.timestamp, blockIndex: i }))
 				.sort((a, b) => a.timestamp - b.timestamp);
@@ -859,7 +851,6 @@ export class MatroskaDemuxer extends Demuxer {
 					timestamp: frameTimestamp,
 					duration: frameDuration,
 					isKeyFrame: originalBlock.isKeyFrame,
-					referencedTimestamps: originalBlock.referencedTimestamps,
 					data: frameData,
 					lacing: BlockLacing.None,
 					decoded: true,
@@ -998,7 +989,9 @@ export class MatroskaDemuxer extends Demuxer {
 					clusterPositionCache: [],
 					cuePoints: [],
 
-					isDefault: false,
+					disposition: {
+						...DEFAULT_TRACK_DISPOSITION,
+					},
 					inputTrack: null,
 					codecId: null,
 					codecPrivate: null,
@@ -1163,7 +1156,37 @@ export class MatroskaDemuxer extends Demuxer {
 			case EBMLId.FlagDefault: {
 				if (!this.currentTrack) break;
 
-				this.currentTrack.isDefault = !!readUnsignedInt(slice, size);
+				this.currentTrack.disposition.default = !!readUnsignedInt(slice, size);
+			}; break;
+
+			case EBMLId.FlagForced: {
+				if (!this.currentTrack) break;
+
+				this.currentTrack.disposition.forced = !!readUnsignedInt(slice, size);
+			}; break;
+
+			case EBMLId.FlagOriginal: {
+				if (!this.currentTrack) break;
+
+				this.currentTrack.disposition.original = !!readUnsignedInt(slice, size);
+			}; break;
+
+			case EBMLId.FlagHearingImpaired: {
+				if (!this.currentTrack) break;
+
+				this.currentTrack.disposition.hearingImpaired = !!readUnsignedInt(slice, size);
+			}; break;
+
+			case EBMLId.FlagVisualImpaired: {
+				if (!this.currentTrack) break;
+
+				this.currentTrack.disposition.visuallyImpaired = !!readUnsignedInt(slice, size);
+			}; break;
+
+			case EBMLId.FlagCommentary: {
+				if (!this.currentTrack) break;
+
+				this.currentTrack.disposition.commentary = !!readUnsignedInt(slice, size);
 			}; break;
 
 			case EBMLId.CodecID: {
@@ -1383,9 +1406,17 @@ export class MatroskaDemuxer extends Demuxer {
 				const relativeTimestamp = readI16Be(slice);
 
 				const flags = readU8(slice);
-				const isKeyFrame = !!(flags & 0x80);
 				const lacing = (flags >> 1) & 0x3 as BlockLacing; // If the block is laced, we'll expand it later
 
+				let isKeyFrame = !!(flags & 0x80);
+				if (trackData.track.info?.type === 'audio' && trackData.track.info.codec) {
+					// Some files don't mark their audio packets as key packets (I'm looking at you, Firefox). But, we
+					// can fix this in most cases: if we recognize the codec of the track, then we know every packet is
+					// necessarily a key packet, no matter what the container says.
+					// https://github.com/Vanilagy/mediabunny/issues/192
+					isKeyFrame = true;
+				}
+
 				const blockData = readBytes(slice, size - (slice.filePos - dataStartPos));
 				const hasDecodingInstructions = trackData.track.decodingInstructions.length > 0;
 
@@ -1393,7 +1424,6 @@ export class MatroskaDemuxer extends Demuxer {
 					timestamp: relativeTimestamp, // We'll add the cluster's timestamp to this later
 					duration: 0, // Will set later
 					isKeyFrame,
-					referencedTimestamps: [],
 					data: blockData,
 					lacing,
 					decoded: !hasDecodingInstructions,
@@ -1406,13 +1436,7 @@ export class MatroskaDemuxer extends Demuxer {
 
 				this.readContiguousElements(slice.slice(dataStartPos, size));
 
-				if (this.currentBlock) {
-					for (let i = 0; i < this.currentBlock.referencedTimestamps.length; i++) {
-						this.currentBlock.referencedTimestamps[i]! += this.currentBlock.timestamp;
-					}
-
-					this.currentBlock = null;
-				}
+				this.currentBlock = null;
 			}; break;
 
 			case EBMLId.Block: {
@@ -1436,7 +1460,6 @@ export class MatroskaDemuxer extends Demuxer {
 					timestamp: relativeTimestamp, // We'll add the cluster's timestamp to this later
 					duration: 0, // Will set later
 					isKeyFrame: true,
-					referencedTimestamps: [],
 					data: blockData,
 					lacing,
 					decoded: !hasDecodingInstructions,
@@ -1487,11 +1510,8 @@ export class MatroskaDemuxer extends Demuxer {
 				if (!this.currentBlock) break;
 
 				this.currentBlock.isKeyFrame = false;
-
-				const relativeTimestamp = readSignedInt(slice, size);
-
-				// We'll offset this by the block's timestamp later
-				this.currentBlock.referencedTimestamps.push(relativeTimestamp);
+				// We ignore the actual value here, we just use the reference as an indicator for "not a key frame".
+				// This is in line with FFmpeg's behavior.
 			}; break;
 
 			case EBMLId.Tag: {
@@ -1859,6 +1879,10 @@ abstract class MatroskaTrackBacking implements InputTrackBacking {
 		return this.internalTrack.segment.timestampFactor;
 	}
 
+	getDisposition() {
+		return this.internalTrack.disposition;
+	}
+
 	async getFirstPacket(options: PacketRetrievalOptions) {
 		return this.performClusterLookup(
 			null,
@@ -1886,7 +1910,7 @@ abstract class MatroskaTrackBacking implements InputTrackBacking {
 		// Do a little rounding to catch cases where the result is very close to an integer. If it is, it's likely
 		// that the number was originally an integer divided by the timescale. For stability, it's best
 		// to return the integer in this case.
-		return roundToPrecision(timestamp * this.internalTrack.segment.timestampFactor, 14);
+		return roundIfAlmostInteger(timestamp * this.internalTrack.segment.timestampFactor);
 	}
 
 	async getPacket(timestamp: number, options: PacketRetrievalOptions) {
@@ -2319,6 +2343,7 @@ class MatroskaVideoTrackBacking extends MatroskaTrackBacking implements InputVid
 					codec: this.internalTrack.info.codec,
 					codecDescription: this.internalTrack.info.codecDescription,
 					colorSpace: this.internalTrack.info.colorSpace,
+					avcType: 1, // We don't know better (or do we?) so just assume 'avc1'
 					avcCodecInfo: this.internalTrack.info.codec === 'avc' && firstPacket
 						? extractAvcDecoderConfigurationRecord(firstPacket.data)
 						: null,
@@ -2379,43 +2404,3 @@ class MatroskaAudioTrackBacking extends MatroskaTrackBacking implements InputAud
 		};
 	}
 }
-
-/** Sorts blocks such that referenced blocks come before the blocks that reference them. */
-const sortBlocksByReferences = (blocks: ClusterBlock[]) => {
-	const timestampToBlock = new Map<number, ClusterBlock>();
-
-	for (let i = 0; i < blocks.length; i++) {
-		const block = blocks[i]!;
-		timestampToBlock.set(block.timestamp, block);
-	}
-
-	const processedBlocks = new Set<ClusterBlock>();
-	const result: ClusterBlock[] = [];
-
-	const processBlock = (block: ClusterBlock) => {
-		if (processedBlocks.has(block)) {
-			return;
-		}
-
-		// Marking the block as processed here already; prevents this algorithm from dying on cycles
-		processedBlocks.add(block);
-
-		for (let j = 0; j < block.referencedTimestamps.length; j++) {
-			const timestamp = block.referencedTimestamps[j]!;
-			const otherBlock = timestampToBlock.get(timestamp);
-			if (!otherBlock) {
-				continue;
-			}
-
-			processBlock(otherBlock);
-		}
-
-		result.push(block);
-	};
-
-	for (let i = 0; i < blocks.length; i++) {
-		processBlock(blocks[i]!);
-	}
-
-	return result;
-};
diff --git a/src/matroska/matroska-muxer.ts b/src/matroska/matroska-muxer.ts
index b12b95a..73af407 100644
--- a/src/matroska/matroska-muxer.ts
+++ b/src/matroska/matroska-muxer.ts
@@ -63,7 +63,7 @@ import { Muxer } from '../muxer';
 import { Writer } from '../writer';
 import { EncodedPacket } from '../packet';
 import { parseOpusIdentificationHeader } from '../codec-data';
-import { AttachedFile } from '../tags';
+import { AttachedFile } from '../metadata';
 
 const MIN_CLUSTER_TIMESTAMP_MS = -(2 ** 15);
 const MAX_CLUSTER_TIMESTAMP_MS = 2 ** 15 - 1;
@@ -304,6 +304,24 @@ export class MatroskaMuxer extends Muxer {
 				{ id: EBMLId.TrackNumber, data: trackData.track.id },
 				{ id: EBMLId.TrackUID, data: trackData.track.id },
 				{ id: EBMLId.TrackType, data: TRACK_TYPE_MAP[trackData.type] },
+				trackData.track.metadata.disposition?.default === false
+					? { id: EBMLId.FlagDefault, data: 0 }
+					: null,
+				trackData.track.metadata.disposition?.forced
+					? { id: EBMLId.FlagForced, data: 1 }
+					: null,
+				trackData.track.metadata.disposition?.hearingImpaired
+					? { id: EBMLId.FlagHearingImpaired, data: 1 }
+					: null,
+				trackData.track.metadata.disposition?.visuallyImpaired
+					? { id: EBMLId.FlagVisualImpaired, data: 1 }
+					: null,
+				trackData.track.metadata.disposition?.original
+					? { id: EBMLId.FlagOriginal, data: 1 }
+					: null,
+				trackData.track.metadata.disposition?.commentary
+					? { id: EBMLId.FlagCommentary, data: 1 }
+					: null,
 				{ id: EBMLId.FlagLacing, data: 0 },
 				{ id: EBMLId.Language, data: trackData.track.metadata.languageCode ?? UNDETERMINED_LANGUAGE },
 				{ id: EBMLId.CodecID, data: codecId },
diff --git a/src/media-sink.ts b/src/media-sink.ts
index 195ff2a..539606e 100644
--- a/src/media-sink.ts
+++ b/src/media-sink.ts
@@ -8,10 +8,15 @@
 
 import { parsePcmCodec, PCM_AUDIO_CODECS, PcmAudioCodec, VideoCodec, AudioCodec } from './codec';
 import {
+	concatAvcNalUnits,
+	deserializeAvcDecoderConfigurationRecord,
 	determineVideoPacketType,
+	extractAvcNalUnits,
 	extractHevcNalUnits,
+	extractNalUnitTypeForAvc,
 	extractNalUnitTypeForHevc,
 	HevcNalUnitType,
+	parseAvcSps,
 } from './codec-data';
 import { CustomVideoDecoder, customVideoDecoders, CustomAudioDecoder, customAudioDecoders } from './custom-coder';
 import { InputDisposedError } from './input';
@@ -24,6 +29,7 @@ import {
 	getInt24,
 	getUint24,
 	insertSorted,
+	isChromium,
 	isFirefox,
 	isNumber,
 	isWebKit,
@@ -33,6 +39,7 @@ import {
 	Rotation,
 	toAsyncIterator,
 	toDataView,
+	toUint8Array,
 	validateAnyIterable,
 } from './misc';
 import { EncodedPacket } from './packet';
@@ -197,9 +204,10 @@ export class EncodedPacketSink {
 		}
 
 		const packet = await this._track._backing.getKeyPacket(timestamp, options);
-		if (!packet || packet.type === 'delta') {
+		if (!packet) {
 			return packet;
 		}
+		assert(packet.type === 'key');
 
 		const determinedType = await this._track.determinePacketType(packet);
 		if (determinedType === 'delta') {
@@ -231,9 +239,10 @@ export class EncodedPacketSink {
 		}
 
 		const nextPacket = await this._track._backing.getNextKeyPacket(packet, options);
-		if (!nextPacket || nextPacket.type === 'delta') {
+		if (!nextPacket) {
 			return nextPacket;
 		}
+		assert(nextPacket.type === 'key');
 
 		const determinedType = await this._track.determinePacketType(nextPacket);
 		if (determinedType === 'delta') {
@@ -423,7 +432,6 @@ export abstract class BaseMediaSampleSink<
 
 		// The following is the "pump" process that keeps pumping packets into the decoder
 		(async () => {
-			const decoderError = new Error();
 			const decoder = await this._createDecoder((sample) => {
 				onQueueDequeue();
 				if (sample.timestamp >= endTimestamp) {
@@ -461,7 +469,6 @@ export abstract class BaseMediaSampleSink<
 				}
 			}, (error) => {
 				if (!outOfBandError) {
-					error.stack = decoderError.stack; // Provide a more useful stack trace
 					outOfBandError = error;
 					onQueueNotEmpty();
 				}
@@ -470,9 +477,6 @@ export abstract class BaseMediaSampleSink<
 			const packetSink = this._createPacketSink();
 			const keyPacket = await packetSink.getKeyPacket(startTimestamp, { verifyKeyPackets: true })
 				?? await packetSink.getFirstPacket();
-			if (!keyPacket) {
-				return;
-			}
 
 			let currentPacket: EncodedPacket | null = keyPacket;
 
@@ -494,7 +498,7 @@ export abstract class BaseMediaSampleSink<
 				}
 			}
 
-			const packets = packetSink.packets(keyPacket, endPacket);
+			const packets = packetSink.packets(keyPacket ?? undefined, endPacket);
 			await packets.next(); // Skip the start packet as we already have it
 
 			while (currentPacket && !ended && !this._track.input._disposed) {
@@ -610,7 +614,6 @@ export abstract class BaseMediaSampleSink<
 
 		// The following is the "pump" process that keeps pumping packets into the decoder
 		(async () => {
-			const decoderError = new Error();
 			const decoder = await this._createDecoder((sample) => {
 				onQueueDequeue();
 
@@ -638,7 +641,6 @@ export abstract class BaseMediaSampleSink<
 				}
 			}, (error) => {
 				if (!outOfBandError) {
-					error.stack = decoderError.stack; // Provide a more useful stack trace
 					outOfBandError = error;
 					onQueueNotEmpty();
 				}
@@ -872,6 +874,24 @@ class VideoDecoderWrapper extends DecoderWrapper<VideoSample> {
 				}
 			};
 
+			if (codec === 'avc' && this.decoderConfig.description && isChromium()) {
+				// Chromium has/had a bug with playing interlaced AVC (https://issues.chromium.org/issues/456919096)
+				// which can be worked around by requesting that software decoding be used. So, here we peek into the
+				// AVC description, if present, and switch to software decoding if we find interlaced content.
+				const record = deserializeAvcDecoderConfigurationRecord(toUint8Array(this.decoderConfig.description));
+				if (record && record.sequenceParameterSets.length > 0) {
+					const sps = parseAvcSps(record.sequenceParameterSets[0]!);
+					if (sps && sps.frameMbsOnlyFlag === 0) {
+						this.decoderConfig = {
+							...this.decoderConfig,
+							hardwareAcceleration: 'prefer-software',
+						};
+					}
+				}
+			}
+
+			const stack = new Error('Decoding error').stack;
+
 			this.decoder = new VideoDecoder({
 				output: (frame) => {
 					try {
@@ -880,9 +900,12 @@ class VideoDecoderWrapper extends DecoderWrapper<VideoSample> {
 						this.onError(error as Error);
 					}
 				},
-				error: onError,
+				error: (error) => {
+					error.stack = stack; // Provide a more useful stack trace, the default one sucks
+					this.onError(error);
+				},
 			});
-			this.decoder.configure(decoderConfig);
+			this.decoder.configure(this.decoderConfig);
 		}
 	}
 
@@ -908,8 +931,6 @@ class VideoDecoderWrapper extends DecoderWrapper<VideoSample> {
 			this.raslSkipped = true;
 		}
 
-		this.currentPacketIndex++;
-
 		if (this.customDecoder) {
 			this.customDecoderQueueSize++;
 			void this.customDecoderCallSerializer
@@ -922,9 +943,24 @@ class VideoDecoderWrapper extends DecoderWrapper<VideoSample> {
 				insertSorted(this.inputTimestamps, packet.timestamp, x => x);
 			}
 
+			// Workaround for https://issues.chromium.org/issues/470109459
+			if (isChromium() && this.currentPacketIndex === 0 && this.codec === 'avc') {
+				const nalUnits = extractAvcNalUnits(packet.data, this.decoderConfig);
+				const filteredNalUnits = nalUnits.filter((x) => {
+					const type = extractNalUnitTypeForAvc(x);
+					// These trip up Chromium's key frame detection, so let's strip them
+					return !(type >= 20 && type <= 31);
+				});
+
+				const newData = concatAvcNalUnits(filteredNalUnits, this.decoderConfig);
+				packet = new EncodedPacket(newData, packet.type, packet.timestamp, packet.duration);
+			}
+
 			this.decoder.decode(packet.toEncodedVideoChunk());
 			this.decodeAlphaData(packet);
 		}
+
+		this.currentPacketIndex++;
 	}
 
 	decodeAlphaData(packet: EncodedPacket) {
@@ -980,6 +1016,8 @@ class VideoDecoderWrapper extends DecoderWrapper<VideoSample> {
 				}
 			};
 
+			const stack = new Error('Decoding error').stack;
+
 			this.alphaDecoder = new VideoDecoder({
 				output: (frame) => {
 					try {
@@ -988,7 +1026,10 @@ class VideoDecoderWrapper extends DecoderWrapper<VideoSample> {
 						this.onError(error as Error);
 					}
 				},
-				error: this.onError,
+				error: (error) => {
+					error.stack = stack; // Provide a more useful stack trace, the default one sucks
+					this.onError(error);
+				},
 			});
 			this.alphaDecoder.configure(this.decoderConfig);
 		}
@@ -1744,6 +1785,8 @@ class AudioDecoderWrapper extends DecoderWrapper<AudioSample> {
 
 			void this.customDecoderCallSerializer.call(() => this.customDecoder!.init());
 		} else {
+			const stack = new Error('Decoding error').stack;
+
 			this.decoder = new AudioDecoder({
 				output: (data) => {
 					try {
@@ -1752,7 +1795,10 @@ class AudioDecoderWrapper extends DecoderWrapper<AudioSample> {
 						this.onError(error as Error);
 					}
 				},
-				error: onError,
+				error: (error) => {
+					error.stack = stack; // Provide a more useful stack trace, the default one sucks
+					this.onError(error);
+				},
 			});
 			this.decoder.configure(decoderConfig);
 		}
@@ -2107,11 +2153,14 @@ export class AudioBufferSink {
 
 	/** @internal */
 	_audioSampleToWrappedArrayBuffer(sample: AudioSample): WrappedAudioBuffer {
-		return {
+		const result: WrappedAudioBuffer = {
 			buffer: sample.toAudioBuffer(),
 			timestamp: sample.timestamp,
 			duration: sample.duration,
 		};
+
+		sample.close();
+		return result;
 	}
 
 	/**
diff --git a/src/media-source.ts b/src/media-source.ts
index 86989a2..7b5cae6 100644
--- a/src/media-source.ts
+++ b/src/media-source.ts
@@ -1055,6 +1055,12 @@ export class MediaStreamVideoTrackSource extends VideoSource {
 	private _promiseWithResolvers = promiseWithResolvers();
 	/** @internal */
 	private _errorPromiseAccessed = false;
+	/** @internal */
+	private _paused = false;
+	/** @internal */
+	private _lastSampleTimestamp: number | null = null;
+	/** @internal */
+	private _pauseOffset = 0;
 
 	/** A promise that rejects upon any error within this source. This promise never resolves. */
 	get errorPromise() {
@@ -1062,6 +1068,11 @@ export class MediaStreamVideoTrackSource extends VideoSource {
 		return this._promiseWithResolvers.promise;
 	}
 
+	/** Whether this source is currently paused as a result of calling `.pause()`. */
+	get paused() {
+		return this._paused;
+	}
+
 	/**
 	 * Creates a new {@link MediaStreamVideoTrackSource} from a
 	 * [`MediaStreamVideoTrack`](https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack), which will pull
@@ -1103,8 +1114,29 @@ export class MediaStreamVideoTrackSource extends VideoSource {
 				return;
 			}
 
+			const currentTimestamp = videoFrame.timestamp / 1e6;
+
+			if (this._paused) {
+				const frameSeen = firstVideoFrameTimestamp !== null;
+				if (frameSeen) {
+					if (this._lastSampleTimestamp !== null) {
+						// In addition to dropping this frame, let's also keep track of the time we have lost due to the
+						// pause. Doing it like this instead of simply keeping track of the paused time is better since
+						// it retains the frame rate of the underlying source.
+						const timeDelta = currentTimestamp - this._lastSampleTimestamp;
+						// We modify this field instead of _timestampOffset since we still might have data in flight
+						// in the encoder, with which we don't want to mess.
+						this._pauseOffset -= timeDelta;
+					}
+					this._lastSampleTimestamp = currentTimestamp;
+				}
+
+				videoFrame.close();
+				return;
+			}
+
 			if (firstVideoFrameTimestamp === null) {
-				firstVideoFrameTimestamp = videoFrame.timestamp / 1e6;
+				firstVideoFrameTimestamp = currentTimestamp;
 
 				const muxer = this._connectedTrack!.output._muxer;
 				if (muxer.firstMediaStreamTimestamp === null) {
@@ -1116,13 +1148,19 @@ export class MediaStreamVideoTrackSource extends VideoSource {
 				}
 			}
 
+			this._lastSampleTimestamp = currentTimestamp;
+
 			if (this._encoder.getQueueSize() >= 4) {
 				// Drop frames if the encoder is overloaded
 				videoFrame.close();
 				return;
 			}
 
-			void this._encoder.add(new VideoSample(videoFrame), true)
+			const sample = new VideoSample(videoFrame, {
+				timestamp: currentTimestamp + this._pauseOffset,
+			});
+
+			void this._encoder.add(sample, true)
 				.catch((error) => {
 					errored = true;
 
@@ -1182,6 +1220,19 @@ export class MediaStreamVideoTrackSource extends VideoSource {
 		}
 	}
 
+	/**
+	 * Pauses the capture of video frames - any video frames emitted by the underlying media stream will be ignored
+	 * while paused. This does *not* close the underlying `MediaStreamVideoTrack`, it just ignores its output.
+	 */
+	pause() {
+		this._paused = true;
+	}
+
+	/** Resumes the capture of video frames after being paused. */
+	resume() {
+		this._paused = false;
+	}
+
 	/** @internal */
 	override async _flushAndClose(forceClose: boolean) {
 		if (this._abortController) {
@@ -1294,6 +1345,8 @@ class AudioEncoderWrapper {
 	private customEncoderCallSerializer = new CallSerializer();
 	private customEncoderQueueSize = 0;
 
+	private lastEndSampleIndex: number | null = null;
+
 	/**
 	 * Encoders typically throw their errors "out of band", meaning asynchronously in some other execution context.
 	 * However, we want to surface these errors to the user within the normal control flow, so they don't go uncaught.
@@ -1342,6 +1395,41 @@ class AudioEncoderWrapper {
 			}
 			assert(this.encoderInitialized);
 
+			// Handle padding of gaps with silence to avoid audio drift over time, like in
+			// https://github.com/Vanilagy/mediabunny/issues/176
+			// TODO An open question is how encoders deal with the first AudioData having a non-zero timestamp, and with
+			// AudioDatas that have an overlapping timestamp range.
+			{
+				const startSampleIndex = Math.round(
+					audioSample.timestamp * audioSample.sampleRate,
+				);
+				const endSampleIndex = Math.round(
+					(audioSample.timestamp + audioSample.duration) * audioSample.sampleRate,
+				);
+
+				if (this.lastEndSampleIndex === null) {
+					this.lastEndSampleIndex = endSampleIndex;
+				} else {
+					const sampleDiff = startSampleIndex - this.lastEndSampleIndex;
+
+					if (sampleDiff >= 64) {
+						// The gap is big enough, let's add a correction sample
+						const fillSample = new AudioSample({
+							data: new Float32Array(sampleDiff * audioSample.numberOfChannels),
+							format: 'f32-planar',
+							sampleRate: audioSample.sampleRate,
+							numberOfChannels: audioSample.numberOfChannels,
+							numberOfFrames: sampleDiff,
+							timestamp: this.lastEndSampleIndex / audioSample.sampleRate,
+						});
+
+						await this.add(fillSample, true); // Recursive call
+					}
+
+					this.lastEndSampleIndex += audioSample.numberOfFrames;
+				}
+			}
+
 			if (this.customEncoder) {
 				this.customEncoderQueueSize++;
 
@@ -1820,6 +1908,12 @@ export class MediaStreamAudioTrackSource extends AudioSource {
 	private _promiseWithResolvers = promiseWithResolvers();
 	/** @internal */
 	private _errorPromiseAccessed = false;
+	/** @internal */
+	private _paused = false;
+	/** @internal */
+	private _lastSampleTimestamp: number | null = null;
+	/** @internal */
+	private _pauseOffset = 0;
 
 	/** A promise that rejects upon any error within this source. This promise never resolves. */
 	get errorPromise() {
@@ -1827,6 +1921,11 @@ export class MediaStreamAudioTrackSource extends AudioSource {
 		return this._promiseWithResolvers.promise;
 	}
 
+	/** Whether this source is currently paused as a result of calling `.pause()`. */
+	get paused() {
+		return this._paused;
+	}
+
 	/**
 	 * Creates a new {@link MediaStreamAudioTrackSource} from a `MediaStreamAudioTrack`, which will pull audio samples
 	 * from the stream in real time and encode them according to {@link AudioEncodingConfig}.
@@ -1853,38 +1952,74 @@ export class MediaStreamAudioTrackSource extends AudioSource {
 
 		this._abortController = new AbortController();
 
+		let firstAudioDataTimestamp: number | null = null;
+		let errored = false;
+
+		const onAudioSample = (audioSample: AudioSample) => {
+			if (errored) {
+				audioSample.close();
+				return;
+			}
+
+			const currentTimestamp = audioSample.timestamp;
+
+			if (this._paused) {
+				const dataSeen = firstAudioDataTimestamp !== null;
+				if (dataSeen) {
+					if (this._lastSampleTimestamp !== null) {
+						// In addition to dropping this sample, let's also keep track of the time we have lost due to
+						// the pause. Doing it like this instead of simply keeping track of the paused time is better
+						// since it retains the sample rate of the underlying source.
+						const timeDelta = currentTimestamp - this._lastSampleTimestamp;
+						// We modify this field instead of _timestampOffset since we still might have data in flight
+						// in the encoder, with which we don't want to mess.
+						this._pauseOffset -= timeDelta;
+					}
+					this._lastSampleTimestamp = currentTimestamp;
+				}
+
+				audioSample.close();
+				return;
+			}
+
+			if (firstAudioDataTimestamp === null) {
+				firstAudioDataTimestamp = audioSample.timestamp;
+
+				const muxer = this._connectedTrack!.output._muxer;
+				if (muxer.firstMediaStreamTimestamp === null) {
+					muxer.firstMediaStreamTimestamp = performance.now() / 1000;
+					this._timestampOffset = -firstAudioDataTimestamp;
+				} else {
+					this._timestampOffset = (performance.now() / 1000 - muxer.firstMediaStreamTimestamp)
+						- firstAudioDataTimestamp;
+				}
+			}
+
+			this._lastSampleTimestamp = currentTimestamp;
+
+			if (this._encoder.getQueueSize() >= 4) {
+				// Drop data if the encoder is overloaded
+				audioSample.close();
+				return;
+			}
+
+			audioSample.setTimestamp(currentTimestamp + this._pauseOffset);
+
+			void this._encoder.add(audioSample, true)
+				.catch((error) => {
+					errored = true;
+
+					this._abortController?.abort();
+					this._promiseWithResolvers.reject(error);
+					void this._audioContext?.suspend();
+				});
+		};
+
 		if (typeof MediaStreamTrackProcessor !== 'undefined') {
 			// Great, MediaStreamTrackProcessor is supported, this is the preferred way of doing things
-			let firstAudioDataTimestamp: number | null = null;
-
 			const processor = new MediaStreamTrackProcessor({ track: this._track });
 			const consumer = new WritableStream<AudioData>({
-				write: (audioData) => {
-					if (firstAudioDataTimestamp === null) {
-						firstAudioDataTimestamp = audioData.timestamp / 1e6;
-
-						const muxer = this._connectedTrack!.output._muxer;
-						if (muxer.firstMediaStreamTimestamp === null) {
-							muxer.firstMediaStreamTimestamp = performance.now() / 1000;
-							this._timestampOffset = -firstAudioDataTimestamp;
-						} else {
-							this._timestampOffset = (performance.now() / 1000 - muxer.firstMediaStreamTimestamp)
-								- firstAudioDataTimestamp;
-						}
-					}
-
-					if (this._encoder.getQueueSize() >= 4) {
-						// Drop data if the encoder is overloaded
-						audioData.close();
-						return;
-					}
-
-					void this._encoder.add(new AudioSample(audioData), true)
-						.catch((error) => {
-							this._abortController?.abort();
-							this._promiseWithResolvers.reject(error);
-						});
-				},
+				write: audioData => onAudioSample(new AudioSample(audioData)),
 			});
 
 			processor.readable.pipeTo(consumer, {
@@ -1912,7 +2047,6 @@ export class MediaStreamAudioTrackSource extends AudioSource {
 			sourceNode.connect(this._scriptProcessorNode);
 			this._scriptProcessorNode.connect(this._audioContext.destination);
 
-			let audioReceived = false;
 			let totalDuration = 0;
 
 			this._scriptProcessorNode.onaudioprocess = (event) => {
@@ -1920,33 +2054,25 @@ export class MediaStreamAudioTrackSource extends AudioSource {
 				totalDuration += event.inputBuffer.duration;
 
 				for (const audioSample of iterator) {
-					if (!audioReceived) {
-						audioReceived = true;
-
-						const muxer = this._connectedTrack!.output._muxer;
-						if (muxer.firstMediaStreamTimestamp === null) {
-							muxer.firstMediaStreamTimestamp = performance.now() / 1000;
-						} else {
-							this._timestampOffset = performance.now() / 1000 - muxer.firstMediaStreamTimestamp;
-						}
-					}
-
-					if (this._encoder.getQueueSize() >= 4) {
-						// Drop data if the encoder is overloaded
-						audioSample.close();
-						continue;
-					}
-
-					void this._encoder.add(audioSample, true)
-						.catch((error) => {
-							void this._audioContext!.suspend();
-							this._promiseWithResolvers.reject(error);
-						});
+					onAudioSample(audioSample);
 				}
 			};
 		}
 	}
 
+	/**
+	 * Pauses the capture of audio data - any audio data emitted by the underlying media stream will be ignored
+	 * while paused. This does *not* close the underlying `MediaStreamAudioTrack`, it just ignores its output.
+	 */
+	pause() {
+		this._paused = true;
+	}
+
+	/** Resumes the capture of audio data after being paused. */
+	resume() {
+		this._paused = false;
+	}
+
 	/** @internal */
 	override async _flushAndClose(forceClose: boolean) {
 		if (this._abortController) {
diff --git a/src/tags.ts b/src/metadata.ts
similarity index 81%
rename from src/tags.ts
rename to src/metadata.ts
index 9055efc..dc1d166 100644
--- a/src/tags.ts
+++ b/src/metadata.ts
@@ -259,3 +259,62 @@ export const metadataTagsAreEmpty = (tags: MetadataTags) => {
 		&& tags.comment === undefined
 		&& (tags.raw === undefined || Object.keys(tags.raw).length === 0);
 };
+
+/**
+ * Specifies a track's disposition, i.e. information about its intended usage.
+ * @public
+ * @group Miscellaneous
+ */
+export type TrackDisposition = {
+	/**
+	 * Indicates that this track is eligible for automatic selection by a player; that it is the main track among other,
+	 * non-default tracks of the same type.
+	 */
+	default: boolean;
+	/**
+	 * Indicates that players should always display this track by default, even if it goes against the user's default
+	 * preferences. For example, a subtitle track only containing translations of foreign-language audio.
+	 */
+	forced: boolean;
+	/** Indicates that this track is in the content's original language. */
+	original: boolean;
+	/** Indicates that this track contains commentary. */
+	commentary: boolean;
+	/** Indicates that this track is intended for hearing-impaired users. */
+	hearingImpaired: boolean;
+	/** Indicates that this track is intended for visually-impaired users. */
+	visuallyImpaired: boolean;
+};
+
+export const DEFAULT_TRACK_DISPOSITION: TrackDisposition = {
+	default: true,
+	forced: false,
+	original: false,
+	commentary: false,
+	hearingImpaired: false,
+	visuallyImpaired: false,
+};
+
+export const validateTrackDisposition = (disposition: Partial<TrackDisposition>) => {
+	if (!disposition || typeof disposition !== 'object') {
+		throw new TypeError('disposition must be an object.');
+	}
+	if (disposition.default !== undefined && typeof disposition.default !== 'boolean') {
+		throw new TypeError('disposition.default must be a boolean.');
+	}
+	if (disposition.forced !== undefined && typeof disposition.forced !== 'boolean') {
+		throw new TypeError('disposition.forced must be a boolean.');
+	}
+	if (disposition.original !== undefined && typeof disposition.original !== 'boolean') {
+		throw new TypeError('disposition.original must be a boolean.');
+	}
+	if (disposition.commentary !== undefined && typeof disposition.commentary !== 'boolean') {
+		throw new TypeError('disposition.commentary must be a boolean.');
+	}
+	if (disposition.hearingImpaired !== undefined && typeof disposition.hearingImpaired !== 'boolean') {
+		throw new TypeError('disposition.hearingImpaired must be a boolean.');
+	}
+	if (disposition.visuallyImpaired !== undefined && typeof disposition.visuallyImpaired !== 'boolean') {
+		throw new TypeError('disposition.visuallyImpaired must be a boolean.');
+	}
+};
diff --git a/src/misc.ts b/src/misc.ts
index c6f5119..3274e7f 100644
--- a/src/misc.ts
+++ b/src/misc.ts
@@ -157,25 +157,25 @@ export const writeBits = (bytes: Uint8Array, start: number, end: number, value:
 export const toUint8Array = (source: AllowSharedBufferSource): Uint8Array => {
 	if (source.constructor === Uint8Array) { // We want a true Uint8Array, not something that extends it like Buffer
 		return source;
-	} else if (source instanceof ArrayBuffer) {
-		return new Uint8Array(source);
-	} else {
+	} else if (ArrayBuffer.isView(source)) {
 		return new Uint8Array(source.buffer, source.byteOffset, source.byteLength);
+	} else {
+		return new Uint8Array(source);
 	}
 };
 
-export const toDataView = (source: AllowSharedBufferSource) => {
+export const toDataView = (source: AllowSharedBufferSource): DataView => {
 	if (source.constructor === DataView) {
 		return source;
-	} else if (source instanceof ArrayBuffer) {
-		return new DataView(source);
-	} else {
+	} else if (ArrayBuffer.isView(source)) {
 		return new DataView(source.buffer, source.byteOffset, source.byteLength);
+	} else {
+		return new DataView(source);
 	}
 };
 
-export const textDecoder = new TextDecoder();
-export const textEncoder = new TextEncoder();
+export const textDecoder = /* #__PURE__ */ new TextDecoder();
+export const textEncoder = /* #__PURE__ */ new TextEncoder();
 
 export const isIso88591Compatible = (text: string) => {
 	for (let i = 0; i < text.length; i++) {
@@ -201,7 +201,7 @@ export const COLOR_PRIMARIES_MAP = {
 	bt2020: 9, // ITU-R BT.202
 	smpte432: 12, // SMPTE EG 432-1
 };
-export const COLOR_PRIMARIES_MAP_INVERSE = invertObject(COLOR_PRIMARIES_MAP);
+export const COLOR_PRIMARIES_MAP_INVERSE = /* #__PURE__ */ invertObject(COLOR_PRIMARIES_MAP);
 
 export const TRANSFER_CHARACTERISTICS_MAP = {
 	'bt709': 1, // ITU-R BT.709
@@ -211,7 +211,7 @@ export const TRANSFER_CHARACTERISTICS_MAP = {
 	'pq': 16, // Rec. ITU-R BT.2100-2 perceptual quantization (PQ) system
 	'hlg': 18, // Rec. ITU-R BT.2100-2 hybrid loggamma (HLG) system
 };
-export const TRANSFER_CHARACTERISTICS_MAP_INVERSE = invertObject(TRANSFER_CHARACTERISTICS_MAP);
+export const TRANSFER_CHARACTERISTICS_MAP_INVERSE = /* #__PURE__ */ invertObject(TRANSFER_CHARACTERISTICS_MAP);
 
 export const MATRIX_COEFFICIENTS_MAP = {
 	'rgb': 0, // Identity
@@ -220,7 +220,7 @@ export const MATRIX_COEFFICIENTS_MAP = {
 	'smpte170m': 6, // SMPTE 170M
 	'bt2020-ncl': 9, // ITU-R BT.2020-2 (non-constant luminance)
 };
-export const MATRIX_COEFFICIENTS_MAP_INVERSE = invertObject(MATRIX_COEFFICIENTS_MAP);
+export const MATRIX_COEFFICIENTS_MAP_INVERSE = /* #__PURE__ */ invertObject(MATRIX_COEFFICIENTS_MAP);
 
 export type RequiredNonNull<T> = {
 	[K in keyof T]-?: NonNullable<T[K]>;
@@ -486,9 +486,14 @@ export const clamp = (value: number, min: number, max: number) => {
 
 export const UNDETERMINED_LANGUAGE = 'und';
 
-export const roundToPrecision = (value: number, digits: number) => {
-	const factor = 10 ** digits;
-	return Math.round(value * factor) / factor;
+export const roundIfAlmostInteger = (value: number) => {
+	const rounded = Math.round(value);
+
+	if (Math.abs(value / rounded - 1) < 10 * Number.EPSILON) {
+		return rounded;
+	} else {
+		return value;
+	}
 };
 
 export const roundToMultiple = (value: number, multiple: number) => {
@@ -579,6 +584,7 @@ export const retriedFetch = async (
 	url: string | URL | Request,
 	requestInit: RequestInit,
 	getRetryDelay: (previousAttempts: number, error: unknown, url: string | URL | Request) => number | null,
+	shouldStop: () => boolean,
 ) => {
 	let attempts = 0;
 
@@ -586,6 +592,10 @@ export const retriedFetch = async (
 		try {
 			return await fetchFn(url, requestInit);
 		} catch (error) {
+			if (shouldStop()) {
+				throw error;
+			}
+
 			attempts++;
 			const retryDelayInSeconds = getRetryDelay(attempts, error, url);
 
@@ -602,6 +612,10 @@ export const retriedFetch = async (
 			if (retryDelayInSeconds > 0) {
 				await new Promise(resolve => setTimeout(resolve, 1000 * retryDelayInSeconds));
 			}
+
+			if (shouldStop()) {
+				throw error;
+			}
 		}
 	}
 };
@@ -665,10 +679,15 @@ export const isWebKit = () => {
 	}
 
 	// This even returns true for WebKit-wrapping browsers such as Chrome on iOS
-	const result = !!(typeof navigator !== 'undefined' && navigator.vendor?.match(/apple/i));
-
-	isWebKitCache = result;
-	return result;
+	return isWebKitCache = !!(
+		typeof navigator !== 'undefined'
+		&& (
+			navigator.vendor?.match(/apple/i)
+			// Or, in workers:
+			|| (/AppleWebKit/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent))
+			|| /\b(iPad|iPhone|iPod)\b/.test(navigator.userAgent)
+		)
+	);
 };
 
 let isFirefoxCache: boolean | null = null;
@@ -680,6 +699,36 @@ export const isFirefox = () => {
 	return isFirefoxCache = typeof navigator !== 'undefined' && navigator.userAgent?.includes('Firefox');
 };
 
+let isChromiumCache: boolean | null = null;
+export const isChromium = () => {
+	if (isChromiumCache !== null) {
+		return isChromiumCache;
+	}
+
+	return isChromiumCache = !!(
+		typeof navigator !== 'undefined'
+		&& (navigator.vendor?.includes('Google Inc') || /Chrome/.test(navigator.userAgent))
+	);
+};
+
+let chromiumVersionCache: number | null = null;
+export const getChromiumVersion = () => {
+	if (chromiumVersionCache !== null) {
+		return chromiumVersionCache;
+	}
+
+	if (typeof navigator === 'undefined') {
+		return null;
+	}
+
+	const match = /\bChrome\/(\d+)/.exec(navigator.userAgent);
+	if (!match) {
+		return null;
+	}
+
+	return chromiumVersionCache = Number(match[1]!);
+};
+
 /**
  * T or a promise that resolves to T.
  * @group Miscellaneous
diff --git a/src/mp3/mp3-demuxer.ts b/src/mp3/mp3-demuxer.ts
index a8333b5..fe654d8 100644
--- a/src/mp3/mp3-demuxer.ts
+++ b/src/mp3/mp3-demuxer.ts
@@ -10,7 +10,7 @@ import { AudioCodec } from '../codec';
 import { Demuxer } from '../demuxer';
 import { Input } from '../input';
 import { InputAudioTrack, InputAudioTrackBacking } from '../input-track';
-import { MetadataTags } from '../tags';
+import { DEFAULT_TRACK_DISPOSITION, MetadataTags } from '../metadata';
 import { PacketRetrievalOptions } from '../media-sink';
 import { assert, AsyncMutex, binarySearchExact, binarySearchLessOrEqual, UNDETERMINED_LANGUAGE } from '../misc';
 import { EncodedPacket, PLACEHOLDER_DATA } from '../packet';
@@ -257,6 +257,12 @@ class Mp3AudioTrackBacking implements InputAudioTrackBacking {
 		return this.demuxer.firstFrameHeader.sampleRate;
 	}
 
+	getDisposition() {
+		return {
+			...DEFAULT_TRACK_DISPOSITION,
+		};
+	}
+
 	async getDecoderConfig(): Promise<AudioDecoderConfig> {
 		assert(this.demuxer.firstFrameHeader);
 
diff --git a/src/mp3/mp3-muxer.ts b/src/mp3/mp3-muxer.ts
index dd310da..f2c86e8 100644
--- a/src/mp3/mp3-muxer.ts
+++ b/src/mp3/mp3-muxer.ts
@@ -7,7 +7,7 @@
  */
 
 import { assert, toDataView } from '../misc';
-import { metadataTagsAreEmpty } from '../tags';
+import { metadataTagsAreEmpty } from '../metadata';
 import { Muxer } from '../muxer';
 import { Output, OutputAudioTrack } from '../output';
 import { Mp3OutputFormat } from '../output-format';
diff --git a/src/muxer.ts b/src/muxer.ts
index b23356f..de2a36e 100644
--- a/src/muxer.ts
+++ b/src/muxer.ts
@@ -46,21 +46,21 @@ export abstract class Muxer {
 
 	private trackTimestampInfo = new WeakMap<OutputTrack, {
 		maxTimestamp: number;
-		maxTimestampBeforeLastKeyFrame: number;
+		maxTimestampBeforeLastKeyPacket: number;
 	}>();
 
-	protected validateAndNormalizeTimestamp(track: OutputTrack, timestampInSeconds: number, isKeyFrame: boolean) {
+	protected validateAndNormalizeTimestamp(track: OutputTrack, timestampInSeconds: number, isKeyPacket: boolean) {
 		timestampInSeconds += track.source._timestampOffset;
 
 		let timestampInfo = this.trackTimestampInfo.get(track);
 		if (!timestampInfo) {
-			if (!isKeyFrame) {
-				throw new Error('First frame must be a key frame.');
+			if (!isKeyPacket) {
+				throw new Error('First packet must be a key packet.');
 			}
 
 			timestampInfo = {
 				maxTimestamp: timestampInSeconds,
-				maxTimestampBeforeLastKeyFrame: timestampInSeconds,
+				maxTimestampBeforeLastKeyPacket: timestampInSeconds,
 			};
 			this.trackTimestampInfo.set(track, timestampInfo);
 		}
@@ -69,15 +69,15 @@ export abstract class Muxer {
 			throw new Error(`Timestamps must be non-negative (got ${timestampInSeconds}s).`);
 		}
 
-		if (isKeyFrame) {
-			timestampInfo.maxTimestampBeforeLastKeyFrame = timestampInfo.maxTimestamp;
+		if (isKeyPacket) {
+			timestampInfo.maxTimestampBeforeLastKeyPacket = timestampInfo.maxTimestamp;
 		}
 
-		if (timestampInSeconds < timestampInfo.maxTimestampBeforeLastKeyFrame) {
+		if (timestampInSeconds < timestampInfo.maxTimestampBeforeLastKeyPacket) {
 			throw new Error(
-				`Timestamps cannot be smaller than the highest timestamp of the previous GOP (a GOP begins with a key`
-				+ ` frame and ends right before the next key frame). Got ${timestampInSeconds}s, but highest timestamp`
-				+ ` is ${timestampInfo.maxTimestampBeforeLastKeyFrame}s.`,
+				`Timestamps cannot be smaller than the largest timestamp of the previous GOP (a GOP begins with a key`
+				+ ` packet and ends right before the next key packet). Got ${timestampInSeconds}s, but largest`
+				+ ` timestamp is ${timestampInfo.maxTimestampBeforeLastKeyPacket}s.`,
 			);
 		}
 
diff --git a/src/ogg/ogg-demuxer.ts b/src/ogg/ogg-demuxer.ts
index 495865d..c5164b9 100644
--- a/src/ogg/ogg-demuxer.ts
+++ b/src/ogg/ogg-demuxer.ts
@@ -12,14 +12,14 @@ import { Demuxer } from '../demuxer';
 import { Input } from '../input';
 import { InputAudioTrack, InputAudioTrackBacking } from '../input-track';
 import { PacketRetrievalOptions } from '../media-sink';
-import { MetadataTags } from '../tags';
+import { DEFAULT_TRACK_DISPOSITION, MetadataTags } from '../metadata';
 import {
 	assert,
 	AsyncMutex,
 	binarySearchLessOrEqual,
 	findLast,
 	last,
-	roundToPrecision,
+	roundIfAlmostInteger,
 	toDataView,
 	UNDETERMINED_LANGUAGE,
 } from '../misc';
@@ -463,6 +463,12 @@ class OggAudioTrackBacking implements InputAudioTrackBacking {
 		return UNDETERMINED_LANGUAGE;
 	}
 
+	getDisposition() {
+		return {
+			...DEFAULT_TRACK_DISPOSITION,
+		};
+	}
+
 	async getFirstTimestamp() {
 		return 0;
 	}
@@ -577,7 +583,7 @@ class OggAudioTrackBacking implements InputAudioTrackBacking {
 			return this.getPacketSequential(timestamp, options);
 		}
 
-		const timestampInSamples = roundToPrecision(timestamp * this.internalSampleRate, 14);
+		const timestampInSamples = roundIfAlmostInteger(timestamp * this.internalSampleRate);
 		if (timestampInSamples === 0) {
 			// Fast path for timestamp 0 - avoids binary search when playing back from the start
 			return this.getFirstPacket(options);
@@ -910,7 +916,7 @@ class OggAudioTrackBacking implements InputAudioTrackBacking {
 		const release = await this.sequentialScanMutex.acquire(); // Requires exclusivity because we write to a cache
 
 		try {
-			const timestampInSamples = roundToPrecision(timestamp * this.internalSampleRate, 14);
+			const timestampInSamples = roundIfAlmostInteger(timestamp * this.internalSampleRate);
 			timestamp = timestampInSamples / this.internalSampleRate;
 
 			const index = binarySearchLessOrEqual(
diff --git a/src/output.ts b/src/output.ts
index 6379388..4046c1f 100644
--- a/src/output.ts
+++ b/src/output.ts
@@ -7,7 +7,7 @@
  */
 
 import { AsyncMutex, isIso639Dash2LanguageCode, Rotation } from './misc';
-import { MetadataTags, validateMetadataTags } from './tags';
+import { MetadataTags, TrackDisposition, validateMetadataTags, validateTrackDisposition } from './metadata';
 import { Muxer } from './muxer';
 import { OutputFormat } from './output-format';
 import { AudioSource, MediaSource, SubtitleSource, VideoSource } from './media-source';
@@ -74,6 +74,8 @@ export type BaseTrackMetadata = {
 	languageCode?: string;
 	/** A user-defined name for this track, like "English" or "Director Commentary". */
 	name?: string;
+	/** The track's disposition, i.e. information about its intended usage. */
+	disposition?: Partial<TrackDisposition>;
 	/**
 	 * The maximum amount of encoded packets that will be added to this track. Setting this field provides the muxer
 	 * with an additional signal that it can use to preallocate space in the file.
@@ -129,6 +131,9 @@ const validateBaseTrackMetadata = (metadata: BaseTrackMetadata) => {
 	if (metadata.name !== undefined && typeof metadata.name !== 'string') {
 		throw new TypeError('metadata.name, when provided, must be a string.');
 	}
+	if (metadata.disposition !== undefined) {
+		validateTrackDisposition(metadata.disposition);
+	}
 	if (
 		metadata.maximumPacketCount !== undefined
 		&& (!Number.isInteger(metadata.maximumPacketCount) || metadata.maximumPacketCount < 0)
diff --git a/src/packet.ts b/src/packet.ts
index f5de60e..4f9b749 100644
--- a/src/packet.ts
+++ b/src/packet.ts
@@ -8,7 +8,7 @@
 
 import { SECOND_TO_MICROSECOND_FACTOR } from './misc';
 
-export const PLACEHOLDER_DATA = new Uint8Array(0);
+export const PLACEHOLDER_DATA = /* #__PURE__ */ new Uint8Array(0);
 
 /**
  * The type of a packet. Key packets can be decoded without previous packets, while delta packets depend on previous
diff --git a/src/sample.ts b/src/sample.ts
index 770f450..b7952bc 100644
--- a/src/sample.ts
+++ b/src/sample.ts
@@ -18,6 +18,7 @@ import {
 	isFirefox,
 	polyfillSymbolDispose,
 	normalizeRotation,
+	assertNever,
 } from './misc';
 
 polyfillSymbolDispose();
@@ -37,6 +38,105 @@ declare global {
 	}
 }
 
+type FinalizationRegistryValue = {
+	type: 'video';
+	data: VideoFrame | OffscreenCanvas | Uint8Array;
+} | {
+	type: 'audio';
+	data: AudioData | Uint8Array;
+};
+
+// Let's manually handle logging the garbage collection errors that are typically logged by the browser. This way, they
+// also kick for audio samples (which is normally not the case), making sure any incorrect code is quickly caught.
+let lastVideoGcErrorLog = -Infinity;
+let lastAudioGcErrorLog = -Infinity;
+let finalizationRegistry: FinalizationRegistry<FinalizationRegistryValue> | null = null;
+if (typeof FinalizationRegistry !== 'undefined') {
+	finalizationRegistry = new FinalizationRegistry<FinalizationRegistryValue>((value) => {
+		const now = Date.now();
+
+		if (value.type === 'video') {
+			if (now - lastVideoGcErrorLog >= 1000) {
+				// This error is annoying but oh so important
+				console.error(
+					`A VideoSample was garbage collected without first being closed. For proper resource management,`
+					+ ` make sure to call close() on all your VideoSamples as soon as you're done using them.`,
+				);
+
+				lastVideoGcErrorLog = now;
+			}
+
+			if (typeof VideoFrame !== 'undefined' && value.data instanceof VideoFrame) {
+				value.data.close(); // Prevent the browser error since we're logging our own
+			}
+		} else {
+			if (now - lastAudioGcErrorLog >= 1000) {
+				console.error(
+					`An AudioSample was garbage collected without first being closed. For proper resource management,`
+					+ ` make sure to call close() on all your AudioSamples as soon as you're done using them.`,
+				);
+
+				lastAudioGcErrorLog = now;
+			}
+
+			if (typeof AudioData !== 'undefined' && value.data instanceof AudioData) {
+				value.data.close();
+			}
+		}
+	});
+}
+
+/**
+ * The list of {@link VideoSample} pixel formats.
+ * @group Samples
+ * @public
+ */
+export const VIDEO_SAMPLE_PIXEL_FORMATS = [
+	// 4:2:0 Y, U, V
+	'I420',
+	'I420P10',
+	'I420P12',
+	// 4:2:0 Y, U, V, A
+	'I420A',
+	'I420AP10',
+	'I420AP12',
+	// 4:2:2 Y, U, V
+	'I422',
+	'I422P10',
+	'I422P12',
+	// 4:2:2 Y, U, V, A
+	'I422A',
+	'I422AP10',
+	'I422AP12',
+	// 4:4:4 Y, U, V
+	'I444',
+	'I444P10',
+	'I444P12',
+	// 4:4:4 Y, U, V, A
+	'I444A',
+	'I444AP10',
+	'I444AP12',
+	// 4:2:0 Y, UV
+	'NV12',
+	// 4:4:4 RGBA
+	'RGBA',
+	// 4:4:4 RGBX (opaque)
+	'RGBX',
+	// 4:4:4 BGRA
+	'BGRA',
+	// 4:4:4 BGRX (opaque)
+	'BGRX',
+] as const;
+const VIDEO_SAMPLE_PIXEL_FORMATS_SET = new Set(VIDEO_SAMPLE_PIXEL_FORMATS);
+
+/**
+ * The internal pixel format with which a {@link VideoSample} is stored.
+ * [See pixel formats](https://www.w3.org/TR/webcodecs/#pixel-format) for more.
+ * @group Samples
+ * @public
+ */
+export type VideoSamplePixelFormat = typeof VIDEO_SAMPLE_PIXEL_FORMATS[number];
+
 /**
  * Metadata used for VideoSample initialization.
  * @group Samples
@@ -45,9 +145,9 @@ declare global {
 export type VideoSampleInit = {
 	/**
 	 * The internal pixel format in which the frame is stored.
-	 * [See pixel formats](https://developer.mozilla.org/en-US/docs/Web/API/VideoFrame/format)
+	 * [See pixel formats](https://www.w3.org/TR/webcodecs/#pixel-format)
 	 */
-	format?: VideoPixelFormat;
+	format?: VideoSamplePixelFormat;
 	/** The width of the frame in pixels. */
 	codedWidth?: number;
 	/** The height of the frame in pixels. */
@@ -60,6 +160,8 @@ export type VideoSampleInit = {
 	duration?: number;
 	/** The color space of the frame. */
 	colorSpace?: VideoColorSpaceInit;
+	/** The byte layout of the planes of the frame. */
+	layout?: PlaneLayout[];
 };
 
 /**
@@ -71,14 +173,20 @@ export type VideoSampleInit = {
 export class VideoSample implements Disposable {
 	/** @internal */
 	_data!: VideoFrame | OffscreenCanvas | Uint8Array | null;
+	/**
+	 * Used for the ArrayBuffer-backed case.
+	 * @internal
+	 */
+	_layout!: PlaneLayout[] | null;
 	/** @internal */
 	_closed: boolean = false;
 
 	/**
-	 * The internal pixel format in which the frame is stored.
-	 * [See pixel formats](https://developer.mozilla.org/en-US/docs/Web/API/VideoFrame/format)
+	 * The internal pixel format in which the frame is stored. Will be `null` if it's using an arbitrary internal
+	 * format not representable by `VideoPixelFormat`.
+	 * [See pixel formats](https://www.w3.org/TR/webcodecs/#pixel-format)
 	 */
-	readonly format!: VideoPixelFormat | null;
+	readonly format!: VideoSamplePixelFormat | null;
 	/** The width of the frame in pixels. */
 	readonly codedWidth!: number;
 	/** The height of the frame in pixels. */
@@ -93,7 +201,7 @@ export class VideoSample implements Disposable {
 	/** The duration of the frame in seconds. */
 	readonly duration!: number;
 	/** The color space of the frame. */
-	readonly colorSpace!: VideoColorSpace;
+	readonly colorSpace!: VideoSampleColorSpace;
 
 	/** The width of the frame in pixels after rotation. */
 	get displayWidth() {
@@ -149,12 +257,16 @@ export class VideoSample implements Disposable {
 		data: VideoFrame | CanvasImageSource | AllowSharedBufferSource,
 		init?: VideoSampleInit,
 	) {
-		if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) {
+		if (
+			data instanceof ArrayBuffer
+			|| (typeof SharedArrayBuffer !== 'undefined' && data instanceof SharedArrayBuffer)
+			|| ArrayBuffer.isView(data)
+		) {
 			if (!init || typeof init !== 'object') {
 				throw new TypeError('init must be an object.');
 			}
-			if (!('format' in init) || typeof init.format !== 'string') {
-				throw new TypeError('init.format must be a string.');
+			if (init.format === undefined || !VIDEO_SAMPLE_PIXEL_FORMATS_SET.has(init.format)) {
+				throw new TypeError('init.format must be one of: ' + VIDEO_SAMPLE_PIXEL_FORMATS.join(', '));
 			}
 			if (!Number.isInteger(init.codedWidth) || init.codedWidth! <= 0) {
 				throw new TypeError('init.codedWidth must be a positive integer.');
@@ -173,6 +285,7 @@ export class VideoSample implements Disposable {
 			}
 
 			this._data = toUint8Array(data).slice(); // Copy it
+			this._layout = init.layout ?? createDefaultPlaneLayout(init.format, init.codedWidth!, init.codedHeight!);
 
 			this.format = init.format;
 			this.codedWidth = init.codedWidth!;
@@ -180,7 +293,7 @@ export class VideoSample implements Disposable {
 			this.rotation = init.rotation ?? 0;
 			this.timestamp = init.timestamp!;
 			this.duration = init.duration ?? 0;
-			this.colorSpace = new VideoColorSpace(init.colorSpace);
+			this.colorSpace = new VideoSampleColorSpace(init.colorSpace);
 		} else if (typeof VideoFrame !== 'undefined' && data instanceof VideoFrame) {
 			if (init?.rotation !== undefined && ![0, 90, 180, 270].includes(init.rotation)) {
 				throw new TypeError('init.rotation, when provided, must be 0, 90, 180, or 270.');
@@ -193,6 +306,7 @@ export class VideoSample implements Disposable {
 			}
 
 			this._data = data;
+			this._layout = null;
 
 			this.format = data.format;
 
@@ -212,7 +326,7 @@ export class VideoSample implements Disposable {
 			this.rotation = init?.rotation ?? frameRotation;
 			this.timestamp = init?.timestamp ?? data.timestamp / 1e6;
 			this.duration = init?.duration ?? (data.duration ?? 0) / 1e6;
-			this.colorSpace = data.colorSpace;
+			this.colorSpace = new VideoSampleColorSpace(data.colorSpace);
 		} else if (
 			(typeof HTMLImageElement !== 'undefined' && data instanceof HTMLImageElement)
 			|| (typeof SVGImageElement !== 'undefined' && data instanceof SVGImageElement)
@@ -274,6 +388,7 @@ export class VideoSample implements Disposable {
 			// Draw it to a canvas
 			context.drawImage(data, 0, 0);
 			this._data = canvas;
+			this._layout = null;
 
 			this.format = 'RGBX';
 			this.codedWidth = width;
@@ -281,7 +396,7 @@ export class VideoSample implements Disposable {
 			this.rotation = init.rotation ?? 0;
 			this.timestamp = init.timestamp!;
 			this.duration = init.duration ?? 0;
-			this.colorSpace = new VideoColorSpace({
+			this.colorSpace = new VideoSampleColorSpace({
 				matrix: 'rgb',
 				primaries: 'bt709',
 				transfer: 'iec61966-2-1',
@@ -290,6 +405,8 @@ export class VideoSample implements Disposable {
 		} else {
 			throw new TypeError('Invalid data type: Must be a BufferSource or CanvasImageSource.');
 		}
+
+		finalizationRegistry?.register(this, { type: 'video', data: this._data }, this);
 	}
 
 	/** Clones this video sample. */
@@ -307,8 +424,11 @@ export class VideoSample implements Disposable {
 				rotation: this.rotation,
 			});
 		} else if (this._data instanceof Uint8Array) {
-			return new VideoSample(this._data.slice(), {
+			assert(this._layout);
+
+			return new VideoSample(this._data, {
 				format: this.format!,
+				layout: this._layout,
 				codedWidth: this.codedWidth,
 				codedHeight: this.codedHeight,
 				timestamp: this.timestamp,
@@ -338,6 +458,8 @@ export class VideoSample implements Disposable {
 			return;
 		}
 
+		finalizationRegistry?.unregister(this);
+
 		if (isVideoFrame(this._data)) {
 			this._data.close();
 		} else {
@@ -347,16 +469,43 @@ export class VideoSample implements Disposable {
 		this._closed = true;
 	}
 
-	/** Returns the number of bytes required to hold this video sample's pixel data. */
-	allocationSize() {
+	/**
+	 * Returns the number of bytes required to hold this video sample's pixel data. Throws if `format` is `null`;
+	 * specify an explicit RGB format in the options in this case.
+	 */
+	allocationSize(options: VideoFrameCopyToOptions = {}): number {
+		validateVideoFrameCopyToOptions(options);
+
 		if (this._closed) {
 			throw new Error('VideoSample is closed.');
 		}
+		if ((options.format ?? this.format) === null) {
+			throw new Error(
+				'Cannot get allocation size when format is null. Please manually provide an RGB pixel format in the'
+				+ ' options instead.',
+			);
+		}
 
 		assert(this._data !== null);
 
+		if (!isVideoFrame(this._data)) {
+			if (
+				options.colorSpace
+				|| (options.format && options.format !== this.format)
+				|| options.layout
+				|| options.rect
+			) {
+				// Temporarily convert to VideoFrame to get it done
+				const videoFrame = this.toVideoFrame();
+				const size = videoFrame.allocationSize(options);
+				videoFrame.close();
+
+				return size;
+			}
+		}
+
 		if (isVideoFrame(this._data)) {
-			return this._data.allocationSize();
+			return this._data.allocationSize(options);
 		} else if (this._data instanceof Uint8Array) {
 			return this._data.byteLength;
 		} else {
@@ -364,23 +513,54 @@ export class VideoSample implements Disposable {
 		}
 	}
 
-	/** Copies this video sample's pixel data to an ArrayBuffer or ArrayBufferView. */
-	async copyTo(destination: AllowSharedBufferSource) {
+	/**
+	 * Copies this video sample's pixel data to an ArrayBuffer or ArrayBufferView. Throws if `format` is `null`;
+	 * specify an explicit RGB format in the options in this case.
+	 * @returns The byte layout of the planes of the copied data.
+	 */
+	async copyTo(destination: AllowSharedBufferSource, options: VideoFrameCopyToOptions = {}): Promise<PlaneLayout[]> {
 		if (!isAllowSharedBufferSource(destination)) {
 			throw new TypeError('destination must be an ArrayBuffer or an ArrayBuffer view.');
 		}
+		validateVideoFrameCopyToOptions(options);
 
 		if (this._closed) {
 			throw new Error('VideoSample is closed.');
 		}
+		if ((options.format ?? this.format) === null) {
+			throw new Error(
+				'Cannot copy video sample data when format is null. Please manually provide an RGB pixel format in the'
+				+ ' options instead.',
+			);
+		}
 
 		assert(this._data !== null);
 
+		if (!isVideoFrame(this._data)) {
+			if (
+				options.colorSpace
+				|| (options.format && options.format !== this.format)
+				|| options.layout
+				|| options.rect
+			) {
+				// Temporarily convert to VideoFrame to get it done
+				const videoFrame = this.toVideoFrame();
+				const layout = await videoFrame.copyTo(destination, options);
+				videoFrame.close();
+
+				return layout;
+			}
+		}
+
 		if (isVideoFrame(this._data)) {
-			await this._data.copyTo(destination);
+			return this._data.copyTo(destination, options);
 		} else if (this._data instanceof Uint8Array) {
+			assert(this._layout);
+
 			const dest = toUint8Array(destination);
 			dest.set(this._data);
+
+			return this._layout;
 		} else {
 			const canvas = this._data;
 			const context = canvas.getContext('2d');
@@ -389,6 +569,11 @@ export class VideoSample implements Disposable {
 			const imageData = context.getImageData(0, 0, this.codedWidth, this.codedHeight);
 			const dest = toUint8Array(destination);
 			dest.set(imageData.data);
+
+			return [{
+				offset: 0,
+				stride: 4 * this.codedWidth,
+			}];
 		}
 	}
 
@@ -413,17 +598,15 @@ export class VideoSample implements Disposable {
 			};
 			return new VideoFrame(this._data, init);
 		} else if (this._data instanceof Uint8Array) {
-			const init: VideoFrameBufferInit = {
-				format: this.format!,
+			return new VideoFrame(this._data, {
+				format: this.format! as VideoPixelFormat,
 				codedWidth: this.codedWidth,
 				codedHeight: this.codedHeight,
 				timestamp: this.microsecondTimestamp,
 				duration: this.microsecondDuration || undefined,
 				colorSpace: this.colorSpace,
 				rotation: this.rotation,
-			};
-
-			return new VideoFrame(this._data, init);
+			});
 		} else {
 			const init: VideoFrameInit = {
 				timestamp: this.microsecondTimestamp,
@@ -804,6 +987,40 @@ export class VideoSample implements Disposable {
 	}
 }
 
+/**
+ * Describes the color space of a {@link VideoSample}. Corresponds to the WebCodecs API's VideoColorSpace.
+ * @group Samples
+ * @public
+ */
+export class VideoSampleColorSpace {
+	/** The color primaries standard used. */
+	readonly primaries: VideoColorPrimaries | null;
+	/** The transfer characteristics used. */
+	readonly transfer: VideoTransferCharacteristics | null;
+	/** The color matrix coefficients used. */
+	readonly matrix: VideoMatrixCoefficients | null;
+	/** Whether the color values use the full range or limited range. */
+	readonly fullRange: boolean | null;
+
+	/** Creates a new VideoSampleColorSpace. */
+	constructor(init?: VideoColorSpaceInit) {
+		this.primaries = init?.primaries ?? null;
+		this.transfer = init?.transfer ?? null;
+		this.matrix = init?.matrix ?? null;
+		this.fullRange = init?.fullRange ?? null;
+	}
+
+	/** Serializes the color space to a JSON object. */
+	toJSON(): VideoColorSpaceInit {
+		return {
+			primaries: this.primaries,
+			transfer: this.transfer,
+			matrix: this.matrix,
+			fullRange: this.fullRange,
+		};
+	}
+}
+
 const isVideoFrame = (x: unknown): x is VideoFrame => {
 	return typeof VideoFrame !== 'undefined' && x instanceof VideoFrame;
 };
@@ -852,7 +1069,168 @@ export const validateCropRectangle = (crop: CropRectangle, prefix: string) => {
 	}
 };
 
-const AUDIO_SAMPLE_FORMATS = new Set(
+const validateVideoFrameCopyToOptions = (options: VideoFrameCopyToOptions) => {
+	if (!options || typeof options !== 'object') {
+		throw new TypeError('options must be an object.');
+	}
+	if (options.colorSpace !== undefined && !['display-p3', 'srgb'].includes(options.colorSpace)) {
+		throw new TypeError('options.colorSpace, when provided, must be \'display-p3\' or \'srgb\'.');
+	}
+	if (options.format !== undefined && typeof options.format !== 'string') {
+		throw new TypeError('options.format, when provided, must be a string.');
+	}
+	if (options.layout !== undefined) {
+		if (!Array.isArray(options.layout)) {
+			throw new TypeError('options.layout, when provided, must be an array.');
+		}
+
+		for (const plane of options.layout) {
+			if (!plane || typeof plane !== 'object') {
+				throw new TypeError('Each entry in options.layout must be an object.');
+			}
+			if (!Number.isInteger(plane.offset) || plane.offset < 0) {
+				throw new TypeError('plane.offset must be a non-negative integer.');
+			}
+			if (!Number.isInteger(plane.stride) || plane.stride < 0) {
+				throw new TypeError('plane.stride must be a non-negative integer.');
+			}
+		}
+	}
+	if (options.rect !== undefined) {
+		if (!options.rect || typeof options.rect !== 'object') {
+			throw new TypeError('options.rect, when provided, must be an object.');
+		}
+		if (options.rect.x !== undefined && (!Number.isInteger(options.rect.x) || options.rect.x < 0)) {
+			throw new TypeError('options.rect.x, when provided, must be a non-negative integer.');
+		}
+		if (options.rect.y !== undefined && (!Number.isInteger(options.rect.y) || options.rect.y < 0)) {
+			throw new TypeError('options.rect.y, when provided, must be a non-negative integer.');
+		}
+		if (options.rect.width !== undefined && (!Number.isInteger(options.rect.width) || options.rect.width < 0)) {
+			throw new TypeError('options.rect.width, when provided, must be a non-negative integer.');
+		}
+		if (options.rect.height !== undefined && (!Number.isInteger(options.rect.height) || options.rect.height < 0)) {
+			throw new TypeError('options.rect.height, when provided, must be a non-negative integer.');
+		}
+	}
+};
+
+/** Implements logic from WebCodecs § 9.4.6 "Compute Layout and Allocation Size" */
+const createDefaultPlaneLayout = (
+	format: VideoSamplePixelFormat,
+	codedWidth: number,
+	codedHeight: number,
+): PlaneLayout[] => {
+	const planes = getPlaneConfigs(format);
+	const layouts: PlaneLayout[] = [];
+	let currentOffset = 0;
+
+	for (const plane of planes) {
+		// Per § 9.8, dimensions are usually "rounded up to the nearest integer".
+		const planeWidth = Math.ceil(codedWidth / plane.widthDivisor);
+		const planeHeight = Math.ceil(codedHeight / plane.heightDivisor);
+
+		const stride = planeWidth * plane.sampleBytes;
+
+		// Tight packing
+		const planeSize = stride * planeHeight;
+
+		layouts.push({
+			offset: currentOffset,
+			stride: stride,
+		});
+
+		currentOffset += planeSize;
+	}
+
+	return layouts;
+};
+
+type PlaneConfig = {
+	sampleBytes: number;
+	widthDivisor: number; // Horizontal sub-sampling factor
+	heightDivisor: number; // Vertical sub-sampling factor
+};
+
+/** Helper to retrieve plane configurations based on WebCodecs § 9.8 Pixel Format definitions. */
+const getPlaneConfigs = (format: VideoSamplePixelFormat): PlaneConfig[] => {
+	// Helper for standard YUV planes
+	const yuv = (
+		yBytes: number,
+		uvBytes: number,
+		subX: number,
+		subY: number,
+		hasAlpha: boolean,
+	): PlaneConfig[] => {
+		const configs: PlaneConfig[] = [
+			{ sampleBytes: yBytes, widthDivisor: 1, heightDivisor: 1 },
+			{ sampleBytes: uvBytes, widthDivisor: subX, heightDivisor: subY },
+			{ sampleBytes: uvBytes, widthDivisor: subX, heightDivisor: subY },
+		];
+
+		if (hasAlpha) {
+			// Match luma dimensions
+			configs.push({ sampleBytes: yBytes, widthDivisor: 1, heightDivisor: 1 });
+		}
+
+		return configs;
+	};
+
+	switch (format) {
+		case 'I420':
+			return yuv(1, 1, 2, 2, false);
+		case 'I420P10':
+		case 'I420P12':
+			return yuv(2, 2, 2, 2, false);
+		case 'I420A':
+			return yuv(1, 1, 2, 2, true);
+		case 'I420AP10':
+		case 'I420AP12':
+			return yuv(2, 2, 2, 2, true);
+
+		case 'I422':
+			return yuv(1, 1, 2, 1, false);
+		case 'I422P10':
+		case 'I422P12':
+			return yuv(2, 2, 2, 1, false);
+		case 'I422A':
+			return yuv(1, 1, 2, 1, true);
+		case 'I422AP10':
+		case 'I422AP12':
+			return yuv(2, 2, 2, 1, true);
+
+		case 'I444':
+			return yuv(1, 1, 1, 1, false);
+		case 'I444P10':
+		case 'I444P12':
+			return yuv(2, 2, 1, 1, false);
+		case 'I444A':
+			return yuv(1, 1, 1, 1, true);
+		case 'I444AP10':
+		case 'I444AP12':
+			return yuv(2, 2, 1, 1, true);
+
+		case 'NV12':
+			return [
+				{ sampleBytes: 1, widthDivisor: 1, heightDivisor: 1 },
+				{ sampleBytes: 2, widthDivisor: 2, heightDivisor: 2 }, // Interleaved U and V
+			];
+
+		case 'RGBA':
+		case 'RGBX':
+		case 'BGRA':
+		case 'BGRX':
+			return [
+				{ sampleBytes: 4, widthDivisor: 1, heightDivisor: 1 },
+			];
+
+		default:
+			assertNever(format);
+			assert(false);
+	}
+};
+
+const AUDIO_SAMPLE_FORMATS = new Set<AudioSampleFormat>(
 	['f32', 'f32-planar', 's16', 's16-planar', 's32', 's32-planar', 'u8', 'u8-planar'],
 );
 
@@ -1010,6 +1388,8 @@ export class AudioSample implements Disposable {
 
 			this._data = dataBuffer;
 		}
+
+		finalizationRegistry?.register(this, { type: 'audio', data: this._data }, this);
 	}
 
 	/** Returns the number of bytes required to hold the audio sample's data as specified by the given options. */
@@ -1171,9 +1551,8 @@ export class AudioSample implements Disposable {
 				}
 			}
 		} else {
-			// Branch for Uint8Array data (non-AudioData)
 			const uint8Data = this._data;
-			const srcView = new DataView(uint8Data.buffer, uint8Data.byteOffset, uint8Data.byteLength);
+			const srcView = toDataView(uint8Data);
 
 			const srcFormat = this.format;
 			const readFn = getReadFunction(srcFormat);
@@ -1243,6 +1622,8 @@ export class AudioSample implements Disposable {
 			return;
 		}
 
+		finalizationRegistry?.unregister(this);
+
 		if (isAudioData(this._data)) {
 			this._data.close();
 		} else {
@@ -1305,7 +1686,9 @@ export class AudioSample implements Disposable {
 				numberOfFrames: this.numberOfFrames,
 				numberOfChannels: this.numberOfChannels,
 				timestamp: this.microsecondTimestamp,
-				data: this._data,
+				data: this._data.buffer instanceof ArrayBuffer
+					? this._data.buffer
+					: this._data.slice(), // In the case of SharedArrayBuffer, convert to ArrayBuffer
 			});
 		}
 	}
diff --git a/src/source.ts b/src/source.ts
index 68ebac1..0059189 100644
--- a/src/source.ts
+++ b/src/source.ts
@@ -102,10 +102,17 @@ export class BufferSource extends Source {
 	/** @internal */
 	_onreadCalled = false;
 
-	/** Creates a new {@link BufferSource} backed the specified `ArrayBuffer` or `ArrayBufferView`. */
-	constructor(buffer: ArrayBuffer | ArrayBufferView) {
-		if (!(buffer instanceof ArrayBuffer) && !ArrayBuffer.isView(buffer)) {
-			throw new TypeError('buffer must be an ArrayBuffer or ArrayBufferView.');
+	/**
+	 * Creates a new {@link BufferSource} backed by the specified `ArrayBuffer`, `SharedArrayBuffer`,
+	 * or `ArrayBufferView`.
+	 */
+	constructor(buffer: AllowSharedBufferSource) {
+		if (
+			!(buffer instanceof ArrayBuffer)
+			&& !(typeof SharedArrayBuffer !== 'undefined' && buffer instanceof SharedArrayBuffer)
+			&& !ArrayBuffer.isView(buffer)
+		) {
+			throw new TypeError('buffer must be an ArrayBuffer, SharedArrayBuffer, or ArrayBufferView.');
 		}
 
 		super();
@@ -234,12 +241,7 @@ export class BlobSource extends Source {
 				const { done, value } = await reader.read();
 				if (done) {
 					this._orchestrator.forgetWorker(worker);
-
-					if (worker.currentPos < worker.targetPos) { // I think this `if` should always hit?
-						throw new Error('Blob reader stopped unexpectedly before all requested data was read.');
-					}
-
-					break;
+					throw new Error('Blob reader stopped unexpectedly before all requested data was read.');
 				}
 
 				if (worker.aborted) {
@@ -261,6 +263,11 @@ export class BlobSource extends Source {
 		}
 
 		worker.running = false;
+
+		if (worker.aborted) {
+			// MDN: "Calling this method signals a loss of interest in the stream by a consumer."
+			await reader?.cancel();
+		}
 	}
 
 	/** @internal */
@@ -297,6 +304,10 @@ const DEFAULT_RETRY_DELAY
 			= typeof navigator !== 'undefined' && typeof navigator.onLine === 'boolean' ? navigator.onLine : true;
 
 			if (isOnline && originOfSrc !== null && originOfSrc !== window.location.origin) {
+				console.warn(
+					`Request will not be retried because a CORS error was suspected due to different origins. You can`
+					+ ` modify this behavior by providing your own function for the 'getRetryDelay' option.`,
+				);
 				return null;
 			}
 		}
@@ -425,6 +436,7 @@ export class UrlSource extends Source {
 				signal: abortController.signal,
 			}),
 			this._getRetryDelay,
+			() => this._disposed,
 		);
 
 		if (!response.ok) {
@@ -436,7 +448,7 @@ export class UrlSource extends Source {
 		let fileSize: number;
 
 		if (response.status === 206) {
-			fileSize = this._getPartialLengthFromRangeResponse(response);
+			fileSize = this._getTotalLengthFromRangeResponse(response);
 			worker = this._orchestrator.createWorker(0, Math.min(fileSize, URL_SOURCE_MIN_LOAD_AMOUNT));
 		} else {
 			// Server probably returned a 200.
@@ -492,6 +504,7 @@ export class UrlSource extends Source {
 						signal: abortController.signal,
 					}),
 					this._getRetryDelay,
+					() => this._disposed,
 				);
 			}
 
@@ -509,14 +522,6 @@ export class UrlSource extends Source {
 				);
 			}
 
-			const length = this._getPartialLengthFromRangeResponse(response);
-			const required = worker.targetPos - worker.currentPos;
-			if (length < required) {
-				throw new Error(
-					`HTTP response unexpectedly too short: Needed at least ${required} bytes, got only ${length}.`,
-				);
-			}
-
 			if (!response.body) {
 				throw new Error(
 					'Missing HTTP response body stream. The used fetch function must provide the response body as a'
@@ -539,6 +544,11 @@ export class UrlSource extends Source {
 				try {
 					readResult = await reader.read();
 				} catch (error) {
+					if (this._disposed) {
+						// No need to try to retry
+						throw error;
+					}
+
 					const retryDelayInSeconds = this._getRetryDelay(1, error, this._url);
 					if (retryDelayInSeconds !== null) {
 						console.error('Error while reading response stream. Attempting to resume.', error);
@@ -551,60 +561,53 @@ export class UrlSource extends Source {
 				}
 
 				if (worker.aborted) {
-					break;
+					continue; // Cleanup happens in next iteration
 				}
 
 				const { done, value } = readResult;
 
 				if (done) {
-					this._orchestrator.forgetWorker(worker);
-
-					if (worker.currentPos < worker.targetPos) {
-						throw new Error(
-							'Response stream reader stopped unexpectedly before all requested data was read.',
-						);
+					if (worker.currentPos >= worker.targetPos) {
+						// All data was delivered, we're good
+						this._orchestrator.forgetWorker(worker);
+						worker.running = false;
+						return;
 					}
 
-					worker.running = false;
-					return;
+					// The response stopped early, before the target. This can happen if server decides to cap range
+					// requests arbitrarily, even if the request had an uncapped end. In this case, let's fetch the rest
+					// of the data using a new request.
+					break;
 				}
 
 				this.onread?.(worker.currentPos, worker.currentPos + value.length);
 				this._orchestrator.supplyWorkerData(worker, value);
 			}
-
-			if (worker.aborted) {
-				break;
-			}
 		}
 
-		worker.running = false;
-
 		// The previous UrlSource had logic for circumventing https://issues.chromium.org/issues/436025873; I haven't
 		// been able to observe this bug with the new UrlSource (maybe because we're using response streaming), so the
 		// logic for that has vanished for now. Leaving a comment here if this becomes relevant again.
 	}
 
 	/** @internal */
-	private _getPartialLengthFromRangeResponse(response: Response) {
+	private _getTotalLengthFromRangeResponse(response: Response) {
 		const contentRange = response.headers.get('Content-Range');
 		if (contentRange) {
 			const match = /\/(\d+)/.exec(contentRange);
 			if (match) {
 				return Number(match[1]);
-			} else {
-				throw new Error(`Invalid Content-Range header: ${contentRange}`);
 			}
+		}
+
+		const contentLength = response.headers.get('Content-Length');
+		if (contentLength) {
+			return Number(contentLength);
 		} else {
-			const contentLength = response.headers.get('Content-Length');
-			if (contentLength) {
-				return Number(contentLength);
-			} else {
-				throw new Error(
-					'Partial HTTP response (status 206) must surface either Content-Range or'
-					+ ' Content-Length header.',
-				);
-			}
+			throw new Error(
+				'Partial HTTP response (status 206) must surface either Content-Range or'
+				+ ' Content-Length header.',
+			);
 		}
 	}
 
@@ -639,7 +642,7 @@ export class FilePathSource extends Source {
 	_fileHandle: FileHandle | null = null;
 
 	/** Creates a new {@link FilePathSource} backed by the file at the specified file path. */
-	constructor(filePath: string, options: BlobSourceOptions = {}) {
+	constructor(filePath: string, options: FilePathSourceOptions = {}) {
 		if (typeof filePath !== 'string') {
 			throw new TypeError('filePath must be a string.');
 		}
diff --git a/src/target.ts b/src/target.ts
index 168e803..5cb78e3 100644
--- a/src/target.ts
+++ b/src/target.ts
@@ -62,7 +62,7 @@ export type StreamTargetChunk = {
 	/** The operation type. */
 	type: 'write'; // This ensures automatic compatibility with FileSystemWritableFileStream
 	/** The data to write. */
-	data: Uint8Array;
+	data: Uint8Array<ArrayBuffer>;
 	/** The byte offset in the output file at which to write the data. */
 	position: number;
 };
diff --git a/src/wave/wave-demuxer.ts b/src/wave/wave-demuxer.ts
index c552827..56b5db5 100644
--- a/src/wave/wave-demuxer.ts
+++ b/src/wave/wave-demuxer.ts
@@ -11,7 +11,7 @@ import { Demuxer } from '../demuxer';
 import { Input } from '../input';
 import { InputAudioTrack, InputAudioTrackBacking } from '../input-track';
 import { PacketRetrievalOptions } from '../media-sink';
-import { MetadataTags } from '../tags';
+import { DEFAULT_TRACK_DISPOSITION, MetadataTags } from '../metadata';
 import { assert, UNDETERMINED_LANGUAGE } from '../misc';
 import { EncodedPacket, PLACEHOLDER_DATA } from '../packet';
 import { readAscii, readBytes, Reader, readU16, readU32, readU64 } from '../reader';
@@ -407,6 +407,12 @@ class WaveAudioTrackBacking implements InputAudioTrackBacking {
 		return UNDETERMINED_LANGUAGE;
 	}
 
+	getDisposition() {
+		return {
+			...DEFAULT_TRACK_DISPOSITION,
+		};
+	}
+
 	async getFirstTimestamp() {
 		return 0;
 	}
diff --git a/src/wave/wave-muxer.ts b/src/wave/wave-muxer.ts
index 63c8f96..74b6abf 100644
--- a/src/wave/wave-muxer.ts
+++ b/src/wave/wave-muxer.ts
@@ -15,7 +15,7 @@ import { Writer } from '../writer';
 import { EncodedPacket } from '../packet';
 import { WavOutputFormat } from '../output-format';
 import { assert, assertNever, isIso88591Compatible, keyValueIterator } from '../misc';
-import { MetadataTags, metadataTagsAreEmpty } from '../tags';
+import { MetadataTags, metadataTagsAreEmpty } from '../metadata';
 import { Id3V2Writer } from '../id3';
 
 export class WaveMuxer extends Muxer {
diff --git a/src/writer.ts b/src/writer.ts
index 30de003..8f8aa86 100644
--- a/src/writer.ts
+++ b/src/writer.ts
@@ -190,7 +190,7 @@ const MAX_CHUNKS_AT_ONCE = 2;
 interface Chunk {
 	start: number;
 	written: ChunkSection[];
-	data: Uint8Array;
+	data: Uint8Array<ArrayBuffer>;
 	shouldFlush: boolean;
 }
 
@@ -281,7 +281,7 @@ export class StreamTargetWriter extends Writer {
 		const chunks: {
 			start: number;
 			size: number;
-			data?: Uint8Array;
+			data?: Uint8Array<ArrayBuffer>;
 		}[] = [];
 		const sorted = [...this.sections].sort((a, b) => a.start - b.start);
 
diff --git a/test/browser/flac.test.ts b/test/browser/flac.test.ts
index 2aed0e3..ddc065b 100644
--- a/test/browser/flac.test.ts
+++ b/test/browser/flac.test.ts
@@ -19,7 +19,7 @@ test('can decode samples from a FLAC file', async () => {
 
 	const sink = new AudioSampleSink(track);
 
-	const sample = await sink.getSample(1);
+	using sample = await sink.getSample(1);
 	assert(sample);
 	expect(sample.timestamp).toBe(0.9287981859410431);
 });
diff --git a/test/browser/transparency.test.ts b/test/browser/transparency.test.ts
index 35527ae..394c827 100644
--- a/test/browser/transparency.test.ts
+++ b/test/browser/transparency.test.ts
@@ -21,7 +21,7 @@ test('Can decode transparent video', async () => {
 	expect(await videoTrack.canBeTransparent()).toBe(true);
 
 	const sink = new VideoSampleSink(videoTrack);
-	const sample = (await sink.getSample(0.5))!;
+	using sample = (await sink.getSample(0.5))!;
 
 	expect(sample.format).toContain('A'); // Probably RGBA
 	expect(sample.hasAlpha).toBe(true);
@@ -47,10 +47,10 @@ test('Can decode faulty transparent video and behaves gracefully', async () => {
 
 	const sink = new VideoSampleSink(videoTrack);
 
-	const startSample = (await sink.getSample(await videoTrack.getFirstTimestamp()))!;
+	using startSample = (await sink.getSample(await videoTrack.getFirstTimestamp()))!;
 	expect(startSample.format).toContain('A');
 
-	const secondSample = (await sink.getSample(secondKeyPacket.timestamp))!;
+	using secondSample = (await sink.getSample(secondKeyPacket.timestamp))!;
 	expect(secondSample.format).not.toContain('A'); // There was no alpha key frame for this one
 	expect(secondSample.hasAlpha).toBe(false);
 });
@@ -164,7 +164,7 @@ test('Can encode transparent video', async () => {
 
 	const sink = new VideoSampleSink(videoTrack);
 
-	const firstSample = (await sink.getSample(0))!;
+	using firstSample = (await sink.getSample(0))!;
 	expect(firstSample.format).toContain('A');
 
 	probeContext.clearRect(0, 0, probeCanvas.width, probeCanvas.height);
@@ -201,7 +201,7 @@ test('Can encode video with alternating transparency', async () => {
 	await output.start();
 
 	for (let i = 0; i < 64; i++) {
-		const sample = new VideoSample(new Uint8Array(640 * 480 * 4), {
+		using sample = new VideoSample(new Uint8Array(640 * 480 * 4), {
 			format: i % 2 ? 'RGBX' : 'RGBA',
 			codedWidth: 640,
 			codedHeight: 480,
@@ -235,7 +235,7 @@ test('Can encode video with alternating transparency', async () => {
 	const sampleSink = new VideoSampleSink(videoTrack);
 
 	i = 0;
-	for await (const sample of sampleSink.samples()) {
+	for await (using sample of sampleSink.samples()) {
 		if (i % 2) {
 			expect(sample.format).not.toContain('A');
 		} else {
@@ -299,7 +299,7 @@ test('Can transmux transparent video, discards alpha by default', async () => {
 	expect(await videoTrack.canBeTransparent()).toBe(false);
 
 	const sink = new VideoSampleSink(videoTrack);
-	const sample = (await sink.getSample(await videoTrack.getFirstTimestamp()))!;
+	using sample = (await sink.getSample(await videoTrack.getFirstTimestamp()))!;
 	expect(sample.hasAlpha).toBe(false);
 });
 
@@ -331,7 +331,7 @@ test('Can transmux transparent video, can keep alpha', async () => {
 	expect(await videoTrack.canBeTransparent()).toBe(true);
 
 	const sink = new VideoSampleSink(videoTrack);
-	const sample = (await sink.getSample(await videoTrack.getFirstTimestamp()))!;
+	using sample = (await sink.getSample(await videoTrack.getFirstTimestamp()))!;
 	expect(sample.format).toContain('A');
 	expect(sample.hasAlpha).toBe(true);
 });
@@ -370,7 +370,7 @@ test('Can reencode transparent video, keeping alpha', async () => {
 	expect(videoTrack.displayWidth).toBe(320);
 
 	const sink = new VideoSampleSink(videoTrack);
-	const sample = (await sink.getSample(await videoTrack.getFirstTimestamp()))!;
+	using sample = (await sink.getSample(await videoTrack.getFirstTimestamp()))!;
 	expect(sample.format).toContain('A');
 	expect(sample.hasAlpha).toBe(true);
 });
diff --git a/test/browser/video-samples.test.ts b/test/browser/video-samples.test.ts
new file mode 100644
index 0000000..b0c12e6
--- /dev/null
+++ b/test/browser/video-samples.test.ts
@@ -0,0 +1,220 @@
+import { expect, test } from 'vitest';
+import { VideoSample } from '../../src/sample.js';
+
+test('allocationSize', async () => {
+	{
+		const canvas = new OffscreenCanvas(1280, 720);
+		canvas.getContext('2d');
+
+		using sample = new VideoSample(canvas, { timestamp: 0 });
+
+		const size1 = sample.allocationSize();
+		expect(size1).toBe(1280 * 720 * 4);
+
+		const size2 = sample.allocationSize({
+			layout: [{
+				offset: 0,
+				stride: 1300 * 4,
+			}],
+		});
+		expect(size2).toBe(1300 * 720 * 4);
+	}
+
+	{
+		const data = new Uint8Array(1280 * 720 * 4);
+		using sample = new VideoSample(data, {
+			timestamp: 0,
+			codedWidth: 1280,
+			codedHeight: 720,
+			format: 'RGBA',
+		});
+
+		const size1 = sample.allocationSize();
+		expect(size1).toBe(1280 * 720 * 4);
+
+		const size2 = sample.allocationSize({
+			layout: [{
+				offset: 0,
+				stride: 1300 * 4,
+			}],
+		});
+		expect(size2).toBe(1300 * 720 * 4);
+	}
+
+	{
+		const data = new Uint8Array(1280 * 720 * 1.5);
+		using sample = new VideoSample(data, {
+			timestamp: 0,
+			codedWidth: 1280,
+			codedHeight: 720,
+			format: 'I420',
+		});
+
+		const size1 = sample.allocationSize();
+		expect(size1).toBe(1280 * 720 * 1.5);
+
+		const size2 = sample.allocationSize({ format: 'RGBA' });
+		expect(size2).toBe(1280 * 720 * 4);
+
+		const size3 = sample.allocationSize({
+			format: 'RGBA',
+			layout: [{
+				offset: 0,
+				stride: 1300 * 4,
+			}],
+		});
+		expect(size3).toBe(1300 * 720 * 4);
+	}
+});
+
+test('copyTo and plane layouts', async () => {
+	const buffer = new ArrayBuffer(1e7);
+
+	{
+		const canvas = new OffscreenCanvas(1280, 720);
+		canvas.getContext('2d');
+
+		using sample = new VideoSample(canvas, { timestamp: 0 });
+		const layout = await sample.copyTo(buffer);
+
+		expect(layout).toEqual([{
+			offset: 0,
+			stride: 1280 * 4,
+		}]);
+	}
+
+	{
+		const canvas = new OffscreenCanvas(1280, 720);
+		canvas.getContext('2d');
+
+		using sample = new VideoSample(canvas, { timestamp: 0 });
+		const layout = await sample.copyTo(buffer, {
+			layout: [{
+				offset: 0,
+				stride: 1300 * 4,
+			}],
+		});
+
+		expect(layout).toEqual([{
+			offset: 0,
+			stride: 1300 * 4,
+		}]);
+	}
+
+	{
+		const data = new Uint8Array(1280 * 720 * 4);
+		using sample = new VideoSample(data, {
+			timestamp: 0,
+			codedWidth: 1280,
+			codedHeight: 720,
+			format: 'RGBA',
+		});
+		const layout = await sample.copyTo(buffer);
+
+		expect(layout).toEqual([{
+			offset: 0,
+			stride: 1280 * 4,
+		}]);
+	}
+
+	{
+		const data = new Uint8Array(1280 * 720 * 4);
+		using sample = new VideoSample(data, {
+			timestamp: 0,
+			codedWidth: 1280,
+			codedHeight: 720,
+			format: 'RGBA',
+		});
+		const layout = await sample.copyTo(buffer, {
+			layout: [{
+				offset: 0,
+				stride: 1300 * 4,
+			}],
+		});
+
+		expect(layout).toEqual([{
+			offset: 0,
+			stride: 1300 * 4,
+		}]);
+	}
+
+	{
+		const data = new Uint8Array(1300 * 720 * 4);
+		using sample = new VideoSample(data, {
+			timestamp: 0,
+			codedWidth: 1280,
+			codedHeight: 720,
+			format: 'RGBA',
+			layout: [{
+				offset: 0,
+				stride: 1300 * 4,
+			}],
+		});
+		const layout = await sample.copyTo(buffer);
+
+		expect(layout).toEqual([{
+			offset: 0,
+			stride: 1300 * 4,
+		}]);
+
+		using clone = sample.clone();
+		const clonedLayout = await clone.copyTo(buffer);
+
+		expect(clonedLayout).toEqual([{
+			offset: 0,
+			stride: 1300 * 4,
+		}]);
+	}
+
+	{
+		const data = new Uint8Array(1280 * 720 * 1.5);
+		using sample = new VideoSample(data, {
+			timestamp: 0,
+			codedWidth: 1280,
+			codedHeight: 720,
+			format: 'I420',
+		});
+		const layout = await sample.copyTo(buffer);
+
+		expect(layout).toEqual([{
+			offset: 0,
+			stride: 1280,
+		}, {
+			offset: 1280 * 720,
+			stride: 1280 / 2,
+		}, {
+			offset: 1280 * 720 + (1280 / 2) * (720 / 2),
+			stride: 1280 / 2,
+		}]);
+	}
+});
+
+test('null format', async () => {
+	const canvas = new OffscreenCanvas(1280, 720);
+	canvas.getContext('2d');
+
+	const frame = new VideoFrame(canvas, { timestamp: 0 });
+	using sample = new VideoSample(frame);
+	// @ts-expect-error Sybau
+	sample.format = null;
+
+	expect(() => sample.allocationSize()).toThrow('when format is null');
+	await expect(async () => sample.copyTo(new ArrayBuffer())).rejects.toThrow('when format is null');
+
+	const size = sample.allocationSize({ format: 'RGBA' });
+	expect(size).toBe(1280 * 720 * 4);
+	const buffer = new ArrayBuffer(size);
+	const layout = await sample.copyTo(buffer, { format: 'RGBA' });
+
+	expect(layout).toEqual([{
+		offset: 0,
+		stride: 1280 * 4,
+	}]);
+
+	sample.allocationSize({ format: 'RGBX' });
+	sample.allocationSize({ format: 'BGRA' });
+	sample.allocationSize({ format: 'BGRX' });
+	await sample.copyTo(buffer, { format: 'RGBX' });
+	await sample.copyTo(buffer, { format: 'BGRA' });
+	await sample.copyTo(buffer, { format: 'BGRX' });
+});
diff --git a/test/node/annex-b-conversion.test.ts b/test/node/annex-b-conversion.test.ts
new file mode 100644
index 0000000..3e86555
--- /dev/null
+++ b/test/node/annex-b-conversion.test.ts
@@ -0,0 +1,54 @@
+import { expect, test } from 'vitest';
+import { Input } from '../../src/input.js';
+import { BufferSource, FilePathSource } from '../../src/source.js';
+import path from 'node:path';
+import { ALL_FORMATS } from '../../src/input-format.js';
+import { Output } from '../../src/output.js';
+import { Mp4OutputFormat } from '../../src/output-format.js';
+import { BufferTarget } from '../../src/target.js';
+import { Conversion } from '../../src/conversion.js';
+import { EncodedPacketSink } from '../../src/media-sink.js';
+import { extractAvcNalUnits } from '../../src/codec-data.js';
+
+const __dirname = new URL('.', import.meta.url).pathname;
+
+test('Annex B to length-prefixed conversion, MP4', async () => {
+	using originalInput = new Input({
+		source: new FilePathSource(path.join(__dirname, '..', 'public/annex-b-avc.mkv')),
+		formats: ALL_FORMATS,
+	});
+	const originalVideoTrack = (await originalInput.getPrimaryVideoTrack())!;
+	const originalDecoderConfig = (await originalVideoTrack.getDecoderConfig())!;
+	expect(originalDecoderConfig.description).toBeUndefined();
+	expect(originalVideoTrack.codec).toBe('avc');
+
+	const originalSink = new EncodedPacketSink(originalVideoTrack);
+	const originalFirstPacket = await originalSink.getFirstPacket();
+	expect([...originalFirstPacket!.data.slice(0, 4)]).toEqual([0, 0, 0, 1]);
+
+	const originalNalUnits = extractAvcNalUnits(originalFirstPacket!.data, originalDecoderConfig);
+
+	const output = new Output({
+		format: new Mp4OutputFormat(),
+		target: new BufferTarget(),
+	});
+
+	const conversion = await Conversion.init({ input: originalInput, output });
+	await conversion.execute();
+
+	using newInput = new Input({
+		source: new BufferSource(output.target.buffer!),
+		formats: ALL_FORMATS,
+	});
+	const newVideoTrack = (await newInput.getPrimaryVideoTrack())!;
+	const newDecoderConfig = (await newVideoTrack.getDecoderConfig())!;
+	expect(newDecoderConfig.description).toBeDefined();
+	expect(newVideoTrack.codec).toBe('avc');
+
+	const newSink = new EncodedPacketSink(newVideoTrack);
+	const newFirstPacket = await newSink.getFirstPacket();
+	expect([...newFirstPacket!.data.slice(0, 4)]).not.toEqual([0, 0, 0, 1]); // Successfully converted
+
+	const newNalUnits = extractAvcNalUnits(newFirstPacket!.data, newDecoderConfig);
+	expect(newNalUnits).toEqual(originalNalUnits); // Content is the same though
+});
diff --git a/test/node/disposition.test.ts b/test/node/disposition.test.ts
new file mode 100644
index 0000000..18e0b2e
--- /dev/null
+++ b/test/node/disposition.test.ts
@@ -0,0 +1,92 @@
+import { expect, test } from 'vitest';
+import { Output } from '../../src/output.js';
+import { MkvOutputFormat } from '../../src/output-format.js';
+import { BufferTarget } from '../../src/target.js';
+import { EncodedVideoPacketSource } from '../../src/media-source.js';
+import { EncodedPacket } from '../../src/packet.js';
+import { Input } from '../../src/input.js';
+import { BufferSource } from '../../src/source.js';
+import { ALL_FORMATS } from '../../src/input-format.js';
+
+test('Default track disposition', async () => {
+	const output = new Output({
+		format: new MkvOutputFormat(),
+		target: new BufferTarget(),
+	});
+
+	const source = new EncodedVideoPacketSource('avc');
+	output.addVideoTrack(source);
+
+	await output.start();
+	await source.add(new EncodedPacket(new Uint8Array(1024), 'key', 0, 1), {
+		decoderConfig: {
+			codec: 'avc1.123456',
+			codedWidth: 1920,
+			codedHeight: 1080,
+		},
+	});
+
+	await output.finalize();
+
+	using input = new Input({
+		source: new BufferSource(output.target.buffer!),
+		formats: ALL_FORMATS,
+	});
+
+	const track = (await input.getPrimaryVideoTrack())!;
+
+	expect(track.disposition).toEqual({
+		default: true,
+		forced: false,
+		original: false,
+		hearingImpaired: false,
+		visuallyImpaired: false,
+		commentary: false,
+	});
+});
+
+test('Customized track disposition', async () => {
+	const output = new Output({
+		format: new MkvOutputFormat(),
+		target: new BufferTarget(),
+	});
+
+	const source = new EncodedVideoPacketSource('avc');
+	output.addVideoTrack(source, {
+		disposition: {
+			default: false,
+			forced: true,
+			original: true,
+			hearingImpaired: true,
+			visuallyImpaired: true,
+			commentary: true,
+		},
+	});
+
+	await output.start();
+	await source.add(new EncodedPacket(new Uint8Array(1024), 'key', 0, 1), {
+		decoderConfig: {
+			codec: 'avc1.123456',
+			codedWidth: 1920,
+			codedHeight: 1080,
+		},
+	});
+
+	await output.finalize();
+
+	using input = new Input({
+		source: new BufferSource(output.target.buffer!),
+		formats: ALL_FORMATS,
+	});
+
+	const track = (await input.getPrimaryVideoTrack())!;
+
+	expect(track.disposition).toEqual({
+		default: false,
+		forced: true,
+		original: true,
+		hearingImpaired: true,
+		visuallyImpaired: true,
+		commentary: true,
+	});
+});
diff --git a/test/node/metadata-tags.test.ts b/test/node/metadata-tags.test.ts
index ae7ceb2..d9e50c2 100644
--- a/test/node/metadata-tags.test.ts
+++ b/test/node/metadata-tags.test.ts
@@ -15,7 +15,7 @@ import { EncodedPacket } from '../../src/packet.js';
 import { Input } from '../../src/input.js';
 import { BufferSource, FilePathSource } from '../../src/source.js';
 import { ALL_FORMATS } from '../../src/input-format.js';
-import { AttachedFile, MetadataTags } from '../../src/tags.js';
+import { AttachedFile, MetadataTags } from '../../src/metadata.js';
 import path from 'node:path';
 import { AudioCodec, buildAudioCodecString } from '../../src/codec.js';
 import { Conversion } from '../../src/conversion.js';
diff --git a/test/node/node-sample-creation.test.ts b/test/node/node-sample-creation.test.ts
new file mode 100644
index 0000000..0cf4064
--- /dev/null
+++ b/test/node/node-sample-creation.test.ts
@@ -0,0 +1,27 @@
+import { test } from 'vitest';
+import { AudioSample, VideoSample } from '../../src/sample.js';
+
+test('VideoSample creation from bytes', async () => {
+	const bytes = new Uint8Array(1024);
+	const sample = new VideoSample(bytes, {
+		codedWidth: 1280,
+		codedHeight: 720,
+		format: 'RGBA',
+		timestamp: 0,
+	});
+
+	sample.close();
+});
+
+test('AudioSample creation from bytes', async () => {
+	const bytes = new Uint8Array(1024);
+	const sample = new AudioSample({
+		data: bytes,
+		numberOfChannels: 2,
+		format: 's16',
+		sampleRate: 48000,
+		timestamp: 0,
+	});
+
+	sample.close();
+});
diff --git a/test/public/annex-b-avc.mkv b/test/public/annex-b-avc.mkv
new file mode 100644
index 0000000..699dfd2
Binary files /dev/null and b/test/public/annex-b-avc.mkv differ