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Fix Matroska files where no audio packets are key packets (fixes #192)

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Vanilagy
2025-11-12 16:07:17 +01:00
parent 327696666b
commit 02b08e036b
3 changed files with 22 additions and 14 deletions
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src/matroska/matroska-demuxer.ts
+9 -1
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@@ -1374,9 +1374,17 @@ 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;