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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/muxer.ts
+11 -11
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@@ -46,21 +46,21 @@ export abstract class Muxer {
private trackTimestampInfo = new WeakMap<OutputTrack, {
maxTimestamp: number;
maxTimestampBeforeLastKeyFrame: number;
maxTimestampBeforeLastKeyPacket: number;
}>();
protected validateAndNormalizeTimestamp(track: OutputTrack, timestampInSeconds: number, isKeyFrame: boolean) {
protected validateAndNormalizeTimestamp(track: OutputTrack, timestampInSeconds: number, isKeyPacket: boolean) {
timestampInSeconds += track.source._timestampOffset;
let timestampInfo = this.trackTimestampInfo.get(track);
if (!timestampInfo) {
if (!isKeyFrame) {
throw new Error('First frame must be a key frame.');
if (!isKeyPacket) {
throw new Error('First packet must be a key packet.');
}
timestampInfo = {
maxTimestamp: timestampInSeconds,
maxTimestampBeforeLastKeyFrame: timestampInSeconds,
maxTimestampBeforeLastKeyPacket: timestampInSeconds,
};
this.trackTimestampInfo.set(track, timestampInfo);
}
@@ -69,15 +69,15 @@ export abstract class Muxer {
throw new Error(`Timestamps must be non-negative (got ${timestampInSeconds}s).`);
}
if (isKeyFrame) {
timestampInfo.maxTimestampBeforeLastKeyFrame = timestampInfo.maxTimestamp;
if (isKeyPacket) {
timestampInfo.maxTimestampBeforeLastKeyPacket = timestampInfo.maxTimestamp;
}
if (timestampInSeconds < timestampInfo.maxTimestampBeforeLastKeyFrame) {
if (timestampInSeconds < timestampInfo.maxTimestampBeforeLastKeyPacket) {
throw new Error(
`Timestamps cannot be smaller than the highest timestamp of the previous GOP (a GOP begins with a key`
+ ` frame and ends right before the next key frame). Got ${timestampInSeconds}s, but highest timestamp`
+ ` is ${timestampInfo.maxTimestampBeforeLastKeyFrame}s.`,
`Timestamps cannot be smaller than the largest timestamp of the previous GOP (a GOP begins with a key`
+ ` packet and ends right before the next key packet). Got ${timestampInSeconds}s, but largest`
+ ` timestamp is ${timestampInfo.maxTimestampBeforeLastKeyPacket}s.`,
);
}