Merge branch 'main' into hls

test/node/isobmff-muxer.test.ts

@@ -61,3 +61,46 @@ test('ISOBMFF muxer internally converts ADTS to AAC', async () => {
 
 	expect(count).toBe(4557);
 });
+
+test('Fragmented fMP4 with video+audio preserves B-frame CTS', async () => {
+	using input = new Input({
+		source: new FilePathSource(path.join(__dirname, '../public/video.mp4')),
+		formats: ALL_FORMATS,
+	});
+
+	const videoTrack = await input.getPrimaryVideoTrack();
+	const audioTrack = await input.getPrimaryAudioTrack();
+	assert(videoTrack);
+	assert(audioTrack);
+
+	const originalVideoSink = new EncodedPacketSink(videoTrack);
+	const originalTimestamps: number[] = [];
+	for await (const packet of originalVideoSink.packets()) {
+		originalTimestamps.push(packet.timestamp);
+	}
+
+	const output = new Output({
+		format: new Mp4OutputFormat({ fastStart: 'fragmented' }),
+		target: new BufferTarget(),
+	});
+
+	const conversion = await Conversion.init({ input, output, showWarnings: false });
+	await conversion.execute();
+
+	using outputAsInput = new Input({
+		source: new BufferSource(output.target.buffer!),
+		formats: ALL_FORMATS,
+	});
+
+	const outputVideoTrack = await outputAsInput.getPrimaryVideoTrack();
+	assert(outputVideoTrack);
+
+	const videoSink = new EncodedPacketSink(outputVideoTrack);
+
+	const timestamps: number[] = [];
+	for await (const packet of videoSink.packets()) {
+		timestamps.push(packet.timestamp);
+	}
+
+	expect(timestamps).toEqual(originalTimestamps);
+});