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Revert Matroska default duration flooring

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Vanilagy
2025-11-10 21:14:43 +01:00
parent 6022781e8c
commit 8b39eb0d43
2 changed files with 6 additions and 5 deletions
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dev/demux.html
+3 -1
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@@ -14,11 +14,13 @@
source: new Mediabunny.BlobSource(file), source: new Mediabunny.BlobSource(file),
}); });
const videoTrack = await input.getPrimaryVideoTrack(); const videoTrack = await input.getPrimaryAudioTrack();
const sink = new Mediabunny.EncodedPacketSink(videoTrack); const sink = new Mediabunny.EncodedPacketSink(videoTrack);
for await (const packet of sink.packets()) { for await (const packet of sink.packets()) {
console.log(packet.timestamp, packet.duration, packet.timestamp + packet.duration); console.log(packet.timestamp, packet.duration, packet.timestamp + packet.duration);
if (packet.timestamp > 10) break;
} }
/* /*
src/matroska/matroska-demuxer.ts
+3 -4
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@@ -844,13 +844,13 @@ export class MatroskaDemuxer extends Demuxer {
blocks.splice(blockIndex, 1); // Remove the original block blocks.splice(blockIndex, 1); // Remove the original block
const blockDuration = originalBlock.duration || frameCount * (track.defaultDuration ?? 0);
// Now, let's insert each frame as its own block // Now, let's insert each frame as its own block
for (let i = 0; i < frameCount; i++) { for (let i = 0; i < frameCount; i++) {
const frameSize = frameSizes[i]!; const frameSize = frameSizes[i]!;
const frameData = readBytes(slice, frameSize); const frameData = readBytes(slice, frameSize);
const blockDuration = originalBlock.duration || (frameCount * (track.defaultDuration ?? 0));
// Distribute timestamps evenly across the block duration // Distribute timestamps evenly across the block duration
const frameTimestamp = originalBlock.timestamp + (blockDuration * i / frameCount); const frameTimestamp = originalBlock.timestamp + (blockDuration * i / frameCount);
const frameDuration = blockDuration / frameCount; const frameDuration = blockDuration / frameCount;
@@ -1181,9 +1181,8 @@ export class MatroskaDemuxer extends Demuxer {
case EBMLId.DefaultDuration: { case EBMLId.DefaultDuration: {
if (!this.currentTrack) break; if (!this.currentTrack) break;
// Floored to reduce chance of overlapping packets (https://github.com/Vanilagy/mediabunny/issues/170)
this.currentTrack.defaultDuration this.currentTrack.defaultDuration
= Math.floor(this.currentTrack.segment.timestampFactor * readUnsignedInt(slice, size) / 1e9); = this.currentTrack.segment.timestampFactor * readUnsignedInt(slice, size) / 1e9;
}; break; }; break;
case EBMLId.Name: { case EBMLId.Name: {