Bump patch version

Fix typo

.editorconfig

@@ -10,6 +10,6 @@ indent_size = 2
 indent_style = space
 indent_size = 4
 
-[*.yaml]
+[*.yml]
 indent_style = space
 indent_size = 2

.github/workflows/lint.yml

@@ -2,6 +2,7 @@ name: Lint
 
 on:
   push:
+  pull_request:
 
 jobs:
   lint:

.github/workflows/release.yml

@@ -11,9 +11,7 @@ jobs:
   release:
     name: Release
     runs-on: ubuntu-latest
-    permissions:
+    permissions: write-all
-      contents: read
-      id-token: write
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -41,6 +39,11 @@ jobs:
       - name: Run build
         run: npm run build
 
+      - name: Upload build artifacts
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        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
+
       - name: Create Publish to npm
         run: npm publish --provenance
         env:

.gitignore

@@ -1,5 +1,4 @@
 /node_modules
-/build
 /dist
 /dist-docs
 .DS_Store

README.md

@@ -5,7 +5,7 @@
 [![](https://img.shields.io/npm/dm/mediabunny)](https://www.npmjs.com/package/mediabunny)
 
 <div align="center">
-    <img src="./docs/public/mediabunny-logo.svg" height="180">
+    <img src="./docs/public/mediabunny-logo.svg" width="180" height="180">
 </div>
 
 Mediabunny is a JavaScript library for reading, writing, and converting media files (like MP4, WebM, MP3), directly in the browser. It aims to be a complete toolkit for high-performance media operations on the web. It's written from scratch in pure TypeScript, has zero dependencies, is very performant, and is extremely tree-shakable, meaning you only include what you use. You can think of it a bit like [FFmpeg](https://ffmpeg.org/), but built from the ground up for the web.
@@ -16,11 +16,11 @@ Mediabunny is a JavaScript library for reading, writing, and converting media fi
 
 <div align="center">
   <a href="https://www.gling.ai/" target="_blank">
-    <img src="./docs/public/sponsors/gling.svg" height="60" alt="Gling AI">
+    <img src="./docs/public/sponsors/gling.svg" width="60" height="60" alt="Gling AI">
   </a>
   &nbsp;&nbsp;&nbsp;&nbsp;
   <a href="https://diffusion.studio/" target="_blank">
-    <img src="./docs/public/sponsors/diffusionstudio.png" height="60" alt="Diffusion Studio">
+    <img src="./docs/public/sponsors/diffusionstudio.png" width="60" height="60" alt="Diffusion Studio">
   </a>
 </div>
 
@@ -152,7 +152,7 @@ For development, clone this repository and install it using a modern version of
 
 ```bash
 npm install # Install dependencies
-npm run watch # Development build with watch mode
+npm run watch # Build bundles on watch mode
 
 npm run build # Production build with type definitions
 

api-extractor.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://developer.microsoft.com/json-schemas/api-extractor/v7/api-extractor.schema.json",
-  "mainEntryPointFilePath": "build/index.d.ts",
+  "mainEntryPointFilePath": "dist/modules/index.d.ts",
   "bundledPackages": [],
   "compiler": {},
   "apiReport": {

build.mjs

@@ -37,20 +37,20 @@ const esmConfig = {
 
 const ctxUmd = await esbuild.context({
 	...umdConfig,
-	outfile: 'dist/mediabunny.js',
+	outfile: 'dist/bundles/mediabunny.cjs',
 });
 const ctxEsm = await esbuild.context({
 	...esmConfig,
-	outfile: 'dist/mediabunny.mjs',
+	outfile: 'dist/bundles/mediabunny.mjs',
 });
 const ctxUmdMinified = await esbuild.context({
 	...umdConfig,
-	outfile: 'dist/mediabunny.min.js',
+	outfile: 'dist/bundles/mediabunny.min.cjs',
 	minify: true,
 });
 const ctxEsmMinified = await esbuild.context({
 	...esmConfig,
-	outfile: 'dist/mediabunny.min.mjs',
+	outfile: 'dist/bundles/mediabunny.min.mjs',
 	minify: true,
 });
 

dev/convert.html

@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 
-<script src="../dist/mediabunny.js"></script>
+<script src="../dist/bundles/mediabunny.cjs"></script>
 
 <script type="module">
 	const fileInput = document.createElement('input');

dev/demux.html

@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 
-<script src="../dist/mediabunny.js"></script>
+<script src="../dist/bundles/mediabunny.cjs"></script>
 
 <script type="module">
 	const fileInput = document.createElement('input');

dev/live.html

@@ -1,6 +1,6 @@
 <button>Go</button>
 
-<script src="../dist/mediabunny.js"></script>
+<script src="../dist/bundles/mediabunny.cjs"></script>
 
 <script type="module">
     function download(blob, filename) {

dev/mux.html

@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 
-<script src="../dist/mediabunny.js"></script>
+<script src="../dist/bundles/mediabunny.cjs"></script>
 
 <script type="module">
 	function download(blob, filename) {

dev/player.html

@@ -15,7 +15,7 @@
 	</div>
 </div>
 
-<script src="../dist/mediabunny.js"></script>
+<script src="../dist/bundles/mediabunny.cjs"></script>
 
 <script type="module">
 const fileInput = document.querySelector('input[type="file"]');

docs/.vitepress/config.mts

@@ -75,6 +75,7 @@ export default withMermaid({
 			{ icon: 'github', link: 'https://github.com/Vanilagy/mediabunny' },
 			{ icon: 'discord', link: 'https://discord.gg/hmpkyYuS4U' },
 			{ icon: 'x', link: 'https://x.com/vanilagy' },
+			{ icon: 'bluesky', link: 'https://bsky.app/profile/vanilagy.bsky.social' },
 		],
 
 		search: {

docs/guide/installation.md

@@ -27,7 +27,9 @@ ESM is preferred because it gives you tree shaking.
 
 You can also just include the library using a script tag in your HTML:
 ```html
-<script src="path/to/mediabunny.js"></script>
+<script src="mediabunny.cjs"></script>
 ```
 
-You can download the built distribution file from the [releases page](https://github.com/Vanilagy/mediabunny/releases).
+This will add a `Mediabunny` object to the global scope.
+
+You can download a built distribution file from the [releases page](https://github.com/Vanilagy/mediabunny/releases). Use the `*.cjs` builds for normal script tag inclusion, or the `*.mjs` builds for script tags with `type="module"` or direct imports via ESM. Including the `mediabunny.d.ts` declaration file in your TypeScript project will declare a global `Mediabunny` namespace.

docs/index.md

@@ -237,7 +237,7 @@ await conversion.execute();
 </div>
 </div>
 
-<div class="flex flex-col-reverse lg:flex-row gap-4 lg:gap-20 lg:items-center">
+<div class="flex flex-col-reverse lg:flex-row gap-4 lg:gap-20 items-center">
 <div class="relative flex-1 min-w-0">
 <div class="absolute size-70 rounded-full bg-[#ff45ac]/0 top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 blur-[200px]" />
 <img class="relative" src="./assets/inspiring-io.svg">

examples/media-player/media-player.ts

@@ -253,7 +253,7 @@ const runAudioIterator = async () => {
 	}
 
 	// To play back audio, we loop over all audio chunks (typically very short) of the file and play them at the correct
-	// timestamp. The result is a continuous, uninteruppted audio signal.
+	// timestamp. The result is a continuous, uninterrupted audio signal.
 	for await (const { buffer, timestamp } of audioBufferIterator!) {
 		const node = audioContext!.createBufferSource();
 		node.buffer = buffer;

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "mediabunny",
-  "version": "1.0.2",
+  "version": "1.0.6",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mediabunny",
-      "version": "1.0.2",
+      "version": "1.0.6",
       "license": "MPL-2.0",
       "dependencies": {
         "@types/dom-mediacapture-transform": "^0.1.11",
@@ -319,9 +319,9 @@
       }
     },
     "node_modules/@babel/helper-string-parser": {
-      "version": "7.25.9",
+      "version": "7.27.1",
-      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.25.9.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.27.1.tgz",
-      "integrity": "sha512-4A/SCr/2KLd5jrtOMFzaKjVtAei3+2r/NChoBNoZ3EyP/+GlhoaEGoWOZUmFmoITP7zOJyHIMm+DYRd8o3PvHA==",
+      "integrity": "sha512-qMlSxKbpRlAridDExk92nSobyDdpPijUq2DW6oDnUqd0iOGxmQjyqhMIihI9+zv4LPyZdRje2cavWPbCbWm3eA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -329,9 +329,9 @@
       }
     },
     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.25.9",
+      "version": "7.27.1",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.25.9.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.27.1.tgz",
-      "integrity": "sha512-Ed61U6XJc3CVRfkERJWDz4dJwKe7iLmmJsbOGu9wSloNSFttHV0I8g6UAgb7qnK5ly5bGLPd4oXZlxCdANBOWQ==",
+      "integrity": "sha512-D2hP9eA+Sqx1kBZgzxZh0y1trbuU+JoDkiEwqhQ36nodYqJwyEIhPSdMNd7lOm/4io72luTPWH20Yda0xOuUow==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -339,13 +339,13 @@
       }
     },
     "node_modules/@babel/parser": {
-      "version": "7.27.0",
+      "version": "7.28.0",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.27.0.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.28.0.tgz",
-      "integrity": "sha512-iaepho73/2Pz7w2eMS0Q5f83+0RKI7i4xmiYeBmDzfRVbQtTOG7Ts0S4HzJVsTMGI9keU8rNfuZr8DKfSt7Yyg==",
+      "integrity": "sha512-jVZGvOxOuNSsuQuLRTh13nU0AogFlw32w/MT+LV6D3sP5WdbW61E77RnkbaO2dUvmPAYrBDJXGn5gGS6tH4j8g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/types": "^7.27.0"
+        "@babel/types": "^7.28.0"
       },
       "bin": {
         "parser": "bin/babel-parser.js"
@@ -355,14 +355,14 @@
       }
     },
     "node_modules/@babel/types": {
-      "version": "7.27.0",
+      "version": "7.28.0",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.27.0.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.28.0.tgz",
-      "integrity": "sha512-H45s8fVLYjbhFH62dIJ3WtmJ6RSPt/3DRO0ZcT2SUiYiQyz3BLVb9ADEnLl91m74aQPS3AzzeajZHYOalWe3bg==",
+      "integrity": "sha512-jYnje+JyZG5YThjHiF28oT4SIZLnYOcSBb6+SDaFIyzDVSkXQmQQYclJ2R+YxcdmK0AX6x1E5OQNtuh3jHDrUg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/helper-string-parser": "^7.25.9",
+        "@babel/helper-string-parser": "^7.27.1",
-        "@babel/helper-validator-identifier": "^7.25.9"
+        "@babel/helper-validator-identifier": "^7.27.1"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -1238,18 +1238,14 @@
       }
     },
     "node_modules/@jridgewell/gen-mapping": {
-      "version": "0.3.8",
+      "version": "0.3.12",
-      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.12.tgz",
-      "integrity": "sha512-imAbBGkb+ebQyxKgzv5Hu2nmROxoDOXHh80evxdoXNOrvAnVx7zimzc1Oo5h9RlfV4vPXaE2iM5pOFbvOCClWA==",
+      "integrity": "sha512-OuLGC46TjB5BbN1dH8JULVVZY4WTdkF7tV9Ys6wLL1rubZnCMstOhNHueU5bLCrnRuDhKPDM4g6sw4Bel5Gzqg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@jridgewell/set-array": "^1.2.1",
+        "@jridgewell/sourcemap-codec": "^1.5.0",
-        "@jridgewell/sourcemap-codec": "^1.4.10",
         "@jridgewell/trace-mapping": "^0.3.24"
-      },
-      "engines": {
-        "node": ">=6.0.0"
       }
     },
     "node_modules/@jridgewell/resolve-uri": {
@@ -1262,16 +1258,6 @@
         "node": ">=6.0.0"
       }
     },
-    "node_modules/@jridgewell/set-array": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.2.1.tgz",
-      "integrity": "sha512-R8gLRTZeyp03ymzP/6Lil/28tGeGEzhx1q2k703KGWRAI1VdvPIXdG70VJc2pAMw3NA6JKL5hhFu1sJX0Mnn/A==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=6.0.0"
-      }
-    },
     "node_modules/@jridgewell/sourcemap-codec": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.0.tgz",
@@ -1280,9 +1266,9 @@
       "license": "MIT"
     },
     "node_modules/@jridgewell/trace-mapping": {
-      "version": "0.3.25",
+      "version": "0.3.29",
-      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.25.tgz",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.29.tgz",
-      "integrity": "sha512-vNk6aEwybGtawWmy/PzwnGDOjCkLWSD2wqvjGGAgOAwCGWySYXfYoxt00IJkTF+8Lb57DwOb3Aa0o9CApepiYQ==",
+      "integrity": "sha512-uw6guiW/gcAGPDhLmd77/6lW8QLeiV5RUTsAX46Db6oLhGaVj4lhnPwb184s1bkc8kdVg/+h988dro8GRDpmYQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {

package.json

@@ -1,25 +1,27 @@
 {
   "name": "mediabunny",
   "author": "Vanilagy",
-  "version": "1.0.2",
+  "version": "1.0.6",
   "description": "Pure TypeScript media toolkit for reading, writing, and converting media files, directly in the browser.",
   "type": "module",
-  "main": "./dist/mediabunny.js",
+  "main": "./dist/bundles/mediabunny.cjs",
-  "module": "./dist/mediabunny.mjs",
+  "module": "./dist/modules/index.js",
-  "types": "./dist/mediabunny.d.ts",
+  "types": "./dist/modules/index.d.ts",
   "exports": {
-    "types": "./dist/mediabunny.d.ts",
+    "types": "./dist/modules/index.d.ts",
-    "import": "./dist/mediabunny.mjs",
+    "import": "./dist/modules/index.js",
-    "require": "./dist/mediabunny.js"
+    "require": "./dist/bundles/mediabunny.cjs"
   },
   "files": [
     "README.md",
     "package.json",
     "LICENSE",
-    "dist"
+    "dist",
+    "src"
   ],
+  "sideEffects": false,
   "scripts": {
-    "build": "tsx scripts/ensure-license-headers.ts && node build.mjs && tsc -p src && api-extractor run && npm run check-docblocks && tsx scripts/append-namespace.ts",
+    "build": "rm -rf dist && tsx scripts/ensure-license-headers.ts && tsc -p src && npm run fix-build-import-paths && node build.mjs && api-extractor run && npm run check-docblocks && npm run append-namespace",
     "watch": "node build.mjs --watch",
     "lint": "eslint .",
     "check": "tsc -p src --noEmit && tsc -p scripts --noEmit && tsc -p tsconfig.vite.json --noEmit && rm tsconfig.vite.tsbuildinfo",
@@ -28,7 +30,9 @@
     "docs:build": "vitepress build docs && npm run examples:build",
     "docs:preview": "vitepress preview docs",
     "dev": "vite",
-    "examples:build": "vite build"
+    "examples:build": "vite build",
+    "fix-build-import-paths": "find dist -name \"*.js\" -type f -exec sed -i -r \"s/ from '([^']+)';/ from '\\1.js';/g\" {} \\;",
+    "append-namespace": "echo 'export as namespace Mediabunny;' >> dist/mediabunny.d.ts"
   },
   "license": "MPL-2.0",
   "repository": {

scripts/append-namespace.ts

@@ -1,3 +0,0 @@
-import { appendFileSync } from 'fs';
-
-appendFileSync('dist/mediabunny.d.ts', '\nexport as namespace Mediabunny;');

src/index.ts

@@ -6,6 +6,9 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
+/// <reference types="dom-mediacapture-transform" preserve="true" />
+/// <reference types="dom-webcodecs" preserve="true" />
+
 export {
 	Output,
 	OutputOptions,

src/input-format.ts

@@ -13,6 +13,7 @@ import { IsobmffReader } from './isobmff/isobmff-reader';
 import { EBMLId, EBMLReader } from './matroska/ebml';
 import { MatroskaDemuxer } from './matroska/matroska-demuxer';
 import { Mp3Demuxer } from './mp3/mp3-demuxer';
+import { FRAME_HEADER_SIZE } from './mp3/mp3-misc';
 import { Mp3Reader } from './mp3/mp3-reader';
 import { OggDemuxer } from './ogg/ogg-demuxer';
 import { OggReader } from './ogg/ogg-reader';
@@ -245,9 +246,10 @@ export class Mp3InputFormat extends InputFormat {
 		}
 
 		// Fine, we found one frame header, but we're still not entirely sure this is MP3. Let's check if we can find
-		// another header nearby:
+		// another header right after it:
 		mp3Reader.pos = firstHeader.startPos + firstHeader.totalSize;
-		const secondHeader = mp3Reader.readNextFrameHeader(Math.min(framesStartPos + 4096, sourceSize));
+		await mp3Reader.reader.loadRange(mp3Reader.pos, mp3Reader.pos + FRAME_HEADER_SIZE);
+		const secondHeader = mp3Reader.readNextFrameHeader(mp3Reader.pos + FRAME_HEADER_SIZE);
 		if (!secondHeader) {
 			return false;
 		}
@@ -257,7 +259,7 @@ export class Mp3InputFormat extends InputFormat {
 			return false;
 		}
 
-		// We have found two matching MP3 frames, a strong indicator that this is an MP3 file
+		// We have found two matching consecutive MP3 frames, a strong indicator that this is an MP3 file
 		return true;
 	}
 

src/isobmff/isobmff-demuxer.ts

@@ -54,6 +54,7 @@ import {
 	isIso639Dash2LanguageCode,
 	roundToMultiple,
 	normalizeRotation,
+	Bitstream,
 } from '../misc';
 import { EncodedPacket, PLACEHOLDER_DATA } from '../packet';
 import { Reader } from '../reader';
@@ -74,6 +75,7 @@ type InternalTrack = {
 	fragmentLookupTable: FragmentLookupTableEntry[] | null;
 	currentFragmentState: FragmentTrackState | null;
 	fragments: Fragment[];
+	fragmentsWithKeyFrame: Fragment[];
 	/** The segment durations of all edit list entries leading up to the main one (from which the offset is taken.) */
 	editListPreviousSegmentDurations: number;
 	/** The media time offset of the main edit list entry (with media time !== -1) */
@@ -167,6 +169,7 @@ type FragmentTrackState = {
 type FragmentTrackData = {
 	startTimestamp: number;
 	endTimestamp: number;
+	firstKeyFrameTimestamp: number | null;
 	samples: FragmentTrackSample[];
 	presentationTimestamps: {
 		presentationTimestamp: number;
@@ -607,6 +610,7 @@ export class IsobmffDemuxer extends Demuxer {
 					fragmentLookupTable: null,
 					currentFragmentState: null,
 					fragments: [],
+					fragmentsWithKeyFrame: [],
 					editListPreviousSegmentDurations: 0,
 					editListOffset: 0,
 				} satisfies InternalTrack as InternalTrack;
@@ -701,7 +705,10 @@ export class IsobmffDemuxer extends Demuxer {
 					}
 
 					if (relevantEntryFound) {
-						throw new Error('Unsupported edit list: multiple edits are not supported.');
+						console.warn(
+							'Unsupported edit list: multiple edits are not currently supported. Only using first edit.',
+						);
+						break;
 					}
 
 					if (mediaTime === -1) {
@@ -710,7 +717,8 @@ export class IsobmffDemuxer extends Demuxer {
 					}
 
 					if (mediaRate !== 1) {
-						throw new Error('Unsupported edit list: media rate must be 1.');
+						console.warn('Unsupported edit list entry: media rate must be 1.');
+						break;
 					}
 
 					track.editListPreviousSegmentDurations = previousSegmentDurations;
@@ -942,7 +950,8 @@ export class IsobmffDemuxer extends Demuxer {
 							} else if (sampleSize === 16) {
 								track.info.codec = 'pcm-s16be';
 							} else {
-								throw new Error(`Unsupported sample size ${sampleSize} for codec 'twos'.`);
+								console.warn(`Unsupported sample size ${sampleSize} for codec 'twos'.`);
+								track.info.codec = null;
 							}
 						} else if (lowercaseBoxName === 'sowt') {
 							if (sampleSize === 8) {
@@ -950,7 +959,8 @@ export class IsobmffDemuxer extends Demuxer {
 							} else if (sampleSize === 16) {
 								track.info.codec = 'pcm-s16';
 							} else {
-								throw new Error(`Unsupported sample size ${sampleSize} for codec 'sowt'.`);
+								console.warn(`Unsupported sample size ${sampleSize} for codec 'sowt'.`);
+								track.info.codec = null;
 							}
 						} else if (lowercaseBoxName === 'raw ') {
 							track.info.codec = 'pcm-u8';
@@ -1193,7 +1203,8 @@ export class IsobmffDemuxer extends Demuxer {
 						} else if (pcmSampleSize === 32) {
 							track.info.codec = 'pcm-s32';
 						} else {
-							throw new Error(`Invalid ipcm sample size ${pcmSampleSize}.`);
+							console.warn(`Invalid ipcm sample size ${pcmSampleSize}.`);
+							track.info.codec = null;
 						}
 					} else {
 						if (pcmSampleSize === 16) {
@@ -1203,7 +1214,8 @@ export class IsobmffDemuxer extends Demuxer {
 						} else if (pcmSampleSize === 32) {
 							track.info.codec = 'pcm-s32be';
 						} else {
-							throw new Error(`Invalid ipcm sample size ${pcmSampleSize}.`);
+							console.warn(`Invalid ipcm sample size ${pcmSampleSize}.`);
+							track.info.codec = null;
 						}
 					}
 				} else if (track.info.codec === 'pcm-f32be') {
@@ -1215,7 +1227,8 @@ export class IsobmffDemuxer extends Demuxer {
 						} else if (pcmSampleSize === 64) {
 							track.info.codec = 'pcm-f64';
 						} else {
-							throw new Error(`Invalid fpcm sample size ${pcmSampleSize}.`);
+							console.warn(`Invalid fpcm sample size ${pcmSampleSize}.`);
+							track.info.codec = null;
 						}
 					} else {
 						if (pcmSampleSize === 32) {
@@ -1223,7 +1236,8 @@ export class IsobmffDemuxer extends Demuxer {
 						} else if (pcmSampleSize === 64) {
 							track.info.codec = 'pcm-f64be';
 						} else {
-							throw new Error(`Invalid fpcm sample size ${pcmSampleSize}.`);
+							console.warn(`Invalid fpcm sample size ${pcmSampleSize}.`);
+							track.info.codec = null;
 						}
 					}
 				}
@@ -1405,8 +1419,27 @@ export class IsobmffDemuxer extends Demuxer {
 			}; break;
 
 			case 'stz2': {
-				throw new Error('Unsupported.');
+				const track = this.currentTrack;
-			};
+				assert(track);
+
+				if (!track.sampleTable) {
+					break;
+				}
+
+				this.metadataReader.pos += 4; // Version + flags
+				this.metadataReader.pos += 3; // Reserved
+
+				const fieldSize = this.metadataReader.readU8(); // in bits
+				const sampleCount = this.metadataReader.readU32();
+
+				const bytes = this.metadataReader.readBytes(Math.ceil(sampleCount * fieldSize / 8));
+				const bitstream = new Bitstream(bytes);
+
+				for (let i = 0; i < sampleCount; i++) {
+					const sampleSize = bitstream.readBits(fieldSize);
+					track.sampleTable.sampleSizes.push(sampleSize);
+				}
+			}; break;
 
 			case 'stss': {
 				const track = this.currentTrack;
@@ -1635,6 +1668,16 @@ export class IsobmffDemuxer extends Demuxer {
 						);
 						this.currentTrack.fragments.splice(insertionIndex + 1, 0, this.currentFragment);
 
+						const hasKeyFrame = trackData.firstKeyFrameTimestamp !== null;
+						if (hasKeyFrame) {
+							const insertionIndex = binarySearchLessOrEqual(
+								this.currentTrack.fragmentsWithKeyFrame,
+								this.currentFragment.moofOffset,
+								x => x.moofOffset,
+							);
+							this.currentTrack.fragmentsWithKeyFrame.splice(insertionIndex + 1, 0, this.currentFragment);
+						}
+
 						const { currentFragmentState } = this.currentTrack;
 						assert(currentFragmentState);
 
@@ -1733,7 +1776,8 @@ export class IsobmffDemuxer extends Demuxer {
 				assert(track.currentFragmentState);
 
 				if (this.currentFragment.trackData.has(track.id)) {
-					throw new Error('Can\'t have two trun boxes for the same track in one fragment.');
+					console.warn('Can\'t have two trun boxes for the same track in one fragment. Ignoring...');
+					break;
 				}
 
 				const version = this.metadataReader.readU8();
@@ -1770,6 +1814,7 @@ export class IsobmffDemuxer extends Demuxer {
 				const trackData: FragmentTrackData = {
 					startTimestamp: 0,
 					endTimestamp: 0,
+					firstKeyFrameTimestamp: null,
 					samples: [],
 					presentationTimestamps: [],
 					startTimestampIsFinal: false,
@@ -1831,13 +1876,19 @@ export class IsobmffDemuxer extends Demuxer {
 					.map((x, i) => ({ presentationTimestamp: x.presentationTimestamp, sampleIndex: i }))
 					.sort((a, b) => a.presentationTimestamp - b.presentationTimestamp);
 
-				// Update sample durations based on presentation order
+				for (let i = 0; i < trackData.presentationTimestamps.length; i++) {
-				for (let i = 0; i < trackData.presentationTimestamps.length - 1; i++) {
+					const currentEntry = trackData.presentationTimestamps[i]!;
-					const current = trackData.presentationTimestamps[i]!;
+					const currentSample = trackData.samples[currentEntry.sampleIndex]!;
-					const next = trackData.presentationTimestamps[i + 1]!;
 
-					const duration = next.presentationTimestamp - current.presentationTimestamp;
+					if (trackData.firstKeyFrameTimestamp === null && currentSample.isKeyFrame) {
-					trackData.samples[current.sampleIndex]!.duration = duration;
+						trackData.firstKeyFrameTimestamp = currentSample.presentationTimestamp;
+					}
+
+					if (i < trackData.presentationTimestamps.length - 1) {
+						// Update sample durations based on presentation order
+						const nextEntry = trackData.presentationTimestamps[i + 1]!;
+						currentSample.duration = nextEntry.presentationTimestamp - currentEntry.presentationTimestamp;
+					}
 				}
 
 				const firstSample = trackData.samples[trackData.presentationTimestamps[0]!.sampleIndex]!;
@@ -2074,13 +2125,13 @@ abstract class IsobmffTrackBacking implements InputTrackBacking {
 							correctSampleFound: true,
 						};
 					} else {
-						// Walk the list of fragments until we find the next fragment for this track
+						// Walk the list of fragments until we find the next fragment for this track with a key frame
 						let currentFragment = locationInFragment.fragment;
 						while (currentFragment.nextFragment) {
 							currentFragment = currentFragment.nextFragment;
 
 							const trackData = currentFragment.trackData.get(this.internalTrack.id);
-							if (trackData) {
+							if (trackData && trackData.firstKeyFrameTimestamp !== null) {
 								const fragmentIndex = binarySearchExact(
 									this.internalTrack.fragments,
 									currentFragment.moofOffset,
@@ -2089,9 +2140,7 @@ abstract class IsobmffTrackBacking implements InputTrackBacking {
 								assert(fragmentIndex !== -1);
 
 								const keyFrameIndex = trackData.samples.findIndex(x => x.isKeyFrame);
-								if (keyFrameIndex === -1) {
+								assert(keyFrameIndex !== -1); // There must be one
-									throw new Error('Not supported: Fragment does not contain key sample.');
-								}
 
 								return {
 									fragmentIndex,
@@ -2231,26 +2280,34 @@ abstract class IsobmffTrackBacking implements InputTrackBacking {
 	}
 
 	private findKeySampleInFragmentsForTimestamp(timestampInTimescale: number) {
-		const fragmentIndex = binarySearchLessOrEqual(
+		const indexInKeyFrameFragments = binarySearchLessOrEqual(
 			// This array is technically not sorted by start timestamp, but for any reasonable file, it basically is.
-			this.internalTrack.fragments,
+			this.internalTrack.fragmentsWithKeyFrame,
 			timestampInTimescale,
 			x => x.trackData.get(this.internalTrack.id)!.startTimestamp,
 		);
+
+		let fragmentIndex = -1;
 		let sampleIndex = -1;
 		let correctSampleFound = false;
 
-		if (fragmentIndex !== -1) {
+		if (indexInKeyFrameFragments !== -1) {
-			const fragment = this.internalTrack.fragments[fragmentIndex]!;
+			const fragment = this.internalTrack.fragmentsWithKeyFrame[indexInKeyFrameFragments]!;
+
+			// Now, let's find the actual index of the fragment in the list of ALL fragments, not just key frame ones
+			fragmentIndex = binarySearchExact(
+				this.internalTrack.fragments,
+				fragment.moofOffset,
+				x => x.moofOffset,
+			);
+			assert(fragmentIndex !== -1);
+
 			const trackData = fragment.trackData.get(this.internalTrack.id)!;
 			const index = findLastIndex(trackData.presentationTimestamps, (x) => {
 				const sample = trackData.samples[x.sampleIndex]!;
 				return sample.isKeyFrame && x.presentationTimestamp <= timestampInTimescale;
 			});
-
+			assert(index !== -1); // It's a key frame fragment, so there must be a key frame
-			if (index === -1) {
-				throw new Error('Not supported: Fragment does not begin with a key sample.');
-			}
 
 			const entry = trackData.presentationTimestamps[index]!;
 			sampleIndex = entry.sampleIndex;

src/matroska/matroska-demuxer.ts

@@ -484,24 +484,18 @@ export class MatroskaDemuxer extends Demuxer {
 				.map((block, i) => ({ timestamp: block.timestamp, blockIndex: i }))
 				.sort((a, b) => a.timestamp - b.timestamp);
 
-			let hasKeyFrame = false;
 			for (let i = 0; i < trackData.presentationTimestamps.length; i++) {
-				const entry = trackData.presentationTimestamps[i]!;
+				const currentEntry = trackData.presentationTimestamps[i]!;
-				const block = trackData.blocks[entry.blockIndex]!;
+				const currentBlock = trackData.blocks[currentEntry.blockIndex]!;
 
-				if (block.isKeyFrame) {
+				if (trackData.firstKeyFrameTimestamp === null && currentBlock.isKeyFrame) {
-					hasKeyFrame = true;
+					trackData.firstKeyFrameTimestamp = currentBlock.timestamp;
-
-					if (trackData.firstKeyFrameTimestamp === null && block.isKeyFrame) {
-						trackData.firstKeyFrameTimestamp = block.timestamp;
-					}
 				}
 
 				if (i < trackData.presentationTimestamps.length - 1) {
 					// Update block durations based on presentation order
 					const nextEntry = trackData.presentationTimestamps[i + 1]!;
-					const nextBlock = trackData.blocks[nextEntry.blockIndex]!;
+					currentBlock.duration = nextEntry.timestamp - currentBlock.timestamp;
-					block.duration = nextBlock.timestamp - block.timestamp;
 				}
 			}
 
@@ -520,6 +514,7 @@ export class MatroskaDemuxer extends Demuxer {
 				);
 				track.clusters.splice(insertionIndex + 1, 0, cluster);
 
+				const hasKeyFrame = trackData.firstKeyFrameTimestamp !== null;
 				if (hasKeyFrame) {
 					const insertionIndex = binarySearchLessOrEqual(
 						track.clustersWithKeyFrame,
@@ -1210,7 +1205,7 @@ abstract class MatroskaTrackBacking implements InputTrackBacking {
 						correctBlockFound: true,
 					};
 				} else {
-					// Walk the list of clusters until we find the next cluster for this track
+					// Walk the list of clusters until we find the next cluster for this track with a key frame
 					let currentCluster = locationInCluster.cluster;
 					while (currentCluster.nextCluster) {
 						currentCluster = currentCluster.nextCluster;

src/mp3/mp3-misc.ts

@@ -85,6 +85,10 @@ export const readFrameHeader = (word: number, reader: { pos: number; fileSize: n
 
 	reader.pos += 1;
 
+	if (firstByte !== 0xff) {
+		return null;
+	}
+
 	if ((secondByte & 0xe0) !== 0xe0) {
 		return null;
 	}

src/mp3/mp3-reader.ts

@@ -65,7 +65,7 @@ export class Mp3Reader {
 		assert(this.fileSize);
 		until ??= this.fileSize;
 
-		while (this.pos < until - FRAME_HEADER_SIZE) {
+		while (this.pos <= until - FRAME_HEADER_SIZE) {
 			const word = this.readU32();
 			this.pos -= 4;
 

src/tsconfig.json

@@ -1,9 +1,8 @@
 {
 	"extends": "../tsconfig.json",
 	"compilerOptions": {
-		"outDir": "../build",
+		"outDir": "../dist/modules",
 		"declaration": true,
-		"sourceMap": true,
 		"declarationMap": true,
 		"stripInternal": true,
 		"noEmit": false

vite.config.ts

@@ -20,7 +20,7 @@ const rollupInput = Object.fromEntries(
 export default defineConfig({
 	resolve: {
 		alias: {
-			mediabunny: path.resolve(__dirname, './dist/mediabunny.mjs'),
+			mediabunny: path.resolve(__dirname, './dist/bundles/mediabunny.mjs'),
 		},
 	},
 	plugins: [