diff --git a/dev/convert.html b/dev/convert.html
index 53dda3c..bc1f9d1 100644
--- a/dev/convert.html
+++ b/dev/convert.html
@@ -115,7 +115,7 @@
 					return ctx.canvas;
 				},
 				*/
-				width: 300,
+				//width: 300,
 				//alpha: 'keep',
 				//width: 320,
 				//discard: true,
diff --git a/dev/demux.html b/dev/demux.html
index 953fa06..2bca413 100644
--- a/dev/demux.html
+++ b/dev/demux.html
@@ -14,6 +14,24 @@
 			source: new Mediabunny.BlobSource(file),
 		});
 
+		const videoTrack = await input.getPrimaryVideoTrack();
+		const sink = new Mediabunny.VideoSampleSink(videoTrack);
+
+		console.log(await videoTrack.getDecoderConfig())
+
+		const sink2 = new Mediabunny.EncodedPacketSink(videoTrack);
+		for await (const packet of sink2.packets()) {
+			console.log(packet.data.join(', '))//, window.findNalUnitsInLengthPrefixed(packet.data, 4).map(x => window.extractNalUnitTypeForAvc(x)));
+			if (packet.timestamp > 1) break;
+		}
+
+		//return;
+
+		for await (const sample of sink.samples()) {
+			console.log(sample);
+		}
+
+		/*
 		let total = 0;
 		input.source.onread = (start, end) => {
 			total += end - start;
@@ -22,6 +40,7 @@
 
 		const videoTrack = await input.getPrimaryVideoTrack();
 		const sink = new Mediabunny.EncodedPacketSink(videoTrack);
+		*/
 
 		//console.log(await sink.getPacket(0));
 		/*
@@ -38,7 +57,7 @@
 
 
 
-		const stats = await videoTrack.computePacketStats();
+		//const stats = await videoTrack.computePacketStats();
 		
 		/*
 		const sink = new Mediabunny.EncodedPacketSink(videoTrack);
@@ -47,9 +66,9 @@
 		}
 		*/
 		//console.log(await videoTrack.computeDuration());
-		console.log("Done", stats, total, file.size)
+		//console.log("Done", stats, total, file.size)
 
-		console.log(input);
+		//console.log(input);
 
 		/*
 		const videoTrack = await input.getPrimaryVideoTrack();
diff --git a/package-lock.json b/package-lock.json
index 23c1888..76daac5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mediabunny",
-  "version": "1.24.2",
+  "version": "1.24.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mediabunny",
-      "version": "1.24.2",
+      "version": "1.24.3",
       "license": "MPL-2.0",
       "workspaces": [
         "packages/*"
@@ -7749,9 +7749,9 @@
       }
     },
     "node_modules/mediabunny": {
-      "version": "1.24.1",
-      "resolved": "https://registry.npmjs.org/mediabunny/-/mediabunny-1.24.1.tgz",
-      "integrity": "sha512-k7ki4KGgFE7F4XaUn0sDpPzdB8Hgms5Hq3QonzXyVSMh75oRuyjNhuAWJtAAlzs45gUerlIHZCvHd6/5H7duow==",
+      "version": "1.24.2",
+      "resolved": "https://registry.npmjs.org/mediabunny/-/mediabunny-1.24.2.tgz",
+      "integrity": "sha512-+H2Jha7D8C92F1fysdN+nmBBAOgVV+pNv/Pxc+c//qo2E/idnv8MsZrft7VJsFE5WjK30ESkwW5ezM0oceFIkg==",
       "license": "MPL-2.0",
       "peer": true,
       "workspaces": [
@@ -12242,7 +12242,7 @@
     },
     "packages/mp3-encoder": {
       "name": "@mediabunny/mp3-encoder",
-      "version": "1.24.2",
+      "version": "1.24.3",
       "license": "MPL-2.0",
       "devDependencies": {
         "@types/emscripten": "^1.40.1"
diff --git a/package.json b/package.json
index b6b5c5b..98efb29 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "mediabunny",
   "author": "Vanilagy",
-  "version": "1.24.2",
+  "version": "1.24.3",
   "description": "Pure TypeScript media toolkit for reading, writing, and converting media files, directly in the browser.",
   "type": "module",
   "workspaces": [
diff --git a/packages/mp3-encoder/package.json b/packages/mp3-encoder/package.json
index 12c2d76..c5acbf8 100644
--- a/packages/mp3-encoder/package.json
+++ b/packages/mp3-encoder/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@mediabunny/mp3-encoder",
   "author": "Vanilagy",
-  "version": "1.24.2",
+  "version": "1.24.3",
   "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/src/media-source.ts b/src/media-source.ts
index 2ca13a2..c89b24a 100644
--- a/src/media-source.ts
+++ b/src/media-source.ts
@@ -1159,7 +1159,7 @@ export class MediaStreamVideoTrackSource extends VideoSource {
 					type: 'videoTrack',
 					trackId: this._workerTrackId,
 					track: this._track,
-				}, [this._track]);
+				});
 
 				this._workerListener = (event: MessageEvent) => {
 					const message = event.data as MediaStreamTrackProcessorWorkerMessage;
@@ -1978,17 +1978,19 @@ const mediaStreamTrackProcessorWorkerCode = () => {
 	});
 
 	const abortControllers = new Map<number, AbortController>();
-	const stoppedTracks = new Set<number>();
+	const activeTracks = new Map<number, MediaStreamVideoTrack>();
 
 	self.addEventListener('message', (event) => {
 		const message = event.data as MediaStreamTrackProcessorControllerMessage;
 
 		switch (message.type) {
 			case 'videoTrack': {
+				activeTracks.set(message.trackId, message.track);
+
 				const processor = new MediaStreamTrackProcessor({ track: message.track });
 				const consumer = new WritableStream<VideoFrame>({
 					write: (videoFrame) => {
-						if (stoppedTracks.has(message.trackId)) {
+						if (!activeTracks.has(message.trackId)) {
 							videoFrame.close();
 							return;
 						}
@@ -2026,7 +2028,9 @@ const mediaStreamTrackProcessorWorkerCode = () => {
 					abortControllers.delete(message.trackId);
 				}
 
-				stoppedTracks.add(message.trackId);
+				const track = activeTracks.get(message.trackId);
+				track?.stop();
+				activeTracks.delete(message.trackId);
 
 				sendMessage({
 					type: 'trackStopped',
diff --git a/src/source.ts b/src/source.ts
index 2fe74d4..adafa2e 100644
--- a/src/source.ts
+++ b/src/source.ts
@@ -234,11 +234,19 @@ export class BlobSource extends Source {
 					break;
 				}
 
+				if (worker.aborted) {
+					break;
+				}
+
 				this.onread?.(worker.currentPos, worker.currentPos + value.length);
 				this._orchestrator.supplyWorkerData(worker, value);
 			} else {
 				const data = await this._blob.slice(worker.currentPos, worker.targetPos).arrayBuffer();
 
+				if (worker.aborted) {
+					break;
+				}
+
 				this.onread?.(worker.currentPos, worker.currentPos + data.byteLength);
 				this._orchestrator.supplyWorkerData(worker, new Uint8Array(data));
 			}
@@ -457,7 +465,7 @@ export class UrlSource extends Source {
 	/** @internal */
 	private async _runWorker(worker: ReadWorker) {
 		// The outer loop is for resuming a request if it dies mid-response
-		while (!worker.aborted) {
+		while (true) {
 			const existing = this._existingResponses.get(worker);
 			this._existingResponses.delete(worker);
 
@@ -534,6 +542,10 @@ export class UrlSource extends Source {
 					}
 				}
 
+				if (worker.aborted) {
+					break;
+				}
+
 				const { done, value } = readResult;
 
 				if (done) {
@@ -552,6 +564,10 @@ export class UrlSource extends Source {
 				this.onread?.(worker.currentPos, worker.currentPos + value.length);
 				this._orchestrator.supplyWorkerData(worker, value);
 			}
+
+			if (worker.aborted) {
+				break;
+			}
 		}
 
 		worker.running = false;
@@ -796,6 +812,10 @@ export class StreamSource extends Source {
 			let data = this._options.read(worker.currentPos, originalTargetPos);
 			if (data instanceof Promise) data = await data;
 
+			if (worker.aborted) {
+				break;
+			}
+
 			if (data instanceof Uint8Array) {
 				data = toUint8Array(data); // Normalize things like Node.js Buffer to Uint8Array
 
@@ -833,6 +853,10 @@ export class StreamSource extends Source {
 						throw new TypeError('ReadableStream returned by options.read must yield Uint8Array chunks.');
 					}
 
+					if (worker.aborted) {
+						break;
+					}
+
 					const data = toUint8Array(value); // Normalize things like Node.js Buffer to Uint8Array
 
 					this.onread?.(worker.currentPos, worker.currentPos + data.length);
@@ -1420,7 +1444,10 @@ class ReadOrchestrator {
 			currentPos: startPos,
 			targetPos,
 			running: false,
-			aborted: false,
+			// Due to async shenanigans, it can happen that workers are started after disposal. In this case, instead of
+			// simply not creating the worker, we allow it to run but immediately label it as aborted, so it can then
+			// shut itself down.
+			aborted: this.disposed,
 			pendingSlices: [],
 			age: this.nextAge++,
 		};
@@ -1473,10 +1500,7 @@ class ReadOrchestrator {
 
 	/** Called by a worker when it has read some data. */
 	supplyWorkerData(worker: ReadWorker, bytes: Uint8Array) {
-		if (this.disposed) {
-			// Writes may still come in after disposal, but we just ignore those
-			return;
-		}
+		assert(!worker.aborted);
 
 		const start = worker.currentPos;
 		const end = start + bytes.length;
diff --git a/test/browser/transparency.test.ts b/test/browser/transparency.test.ts
index 743e826..7b7f40b 100644
--- a/test/browser/transparency.test.ts
+++ b/test/browser/transparency.test.ts
@@ -139,17 +139,18 @@ test('Can encode transparent video', async () => {
 	probeContext.drawImage(video, 0, 0);
 
 	let imageData = probeContext.getImageData(0, 0, probeCanvas.width, probeCanvas.height);
-	expect(imageData.data[3]).lessThanOrEqual(2); // Transparent (within error)
+	const index1 = (100 + 100 * probeCanvas.width) * 4;
+	expect(imageData.data[index1 + 3]).toBe(0); // Transparent
 
 	const pos = { x: 300, y: 300 }; // Dead center in the red square
-	const index = (pos.x + pos.y * probeCanvas.width) * 4;
+	const index2 = (pos.x + pos.y * probeCanvas.width) * 4;
 
 	// Red (within error)
-	expect(imageData.data[index + 0]).greaterThanOrEqual(253);
-	expect(imageData.data[index + 1]).lessThanOrEqual(2);
-	expect(imageData.data[index + 2]).lessThanOrEqual(2);
+	expect(imageData.data[index2 + 0]).greaterThanOrEqual(253);
+	expect(imageData.data[index2 + 1]).lessThanOrEqual(2);
+	expect(imageData.data[index2 + 2]).lessThanOrEqual(2);
 
-	expect(imageData.data[index + 3]).greaterThanOrEqual(253); // Opaque (within error)
+	expect(imageData.data[index2 + 3]).toBe(255); // Opaque
 
 	// Let's also check it's read correctly by Mediabunny
 	using input = new Input({
@@ -169,7 +170,8 @@ test('Can encode transparent video', async () => {
 	firstSample.draw(probeContext, 0, 0);
 
 	imageData = probeContext.getImageData(0, 0, probeCanvas.width, probeCanvas.height);
-	expect(imageData.data[3]).lessThanOrEqual(2); // Transparent (within error)
+
+	expect(imageData.data[3]).toBe(0); // Transparent
 });
 
 test('Can encode video with alternating transparency', async () => {