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Add metadata-based duration retrieval

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This commit is contained in:
Vanilagy
2026-03-13 17:03:36 +01:00
parent c43ca025d9
commit a9a455e132
23 changed files with 517 additions and 49 deletions
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src/matroska/matroska-muxer.ts
+8 -3
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@@ -152,7 +152,8 @@ export class MatroskaMuxer extends Muxer {
firstMsTimestamp: number;
}>();
private duration = 0;
private startTimestamp = Infinity;
private endTimestamp = -Infinity;
constructor(output: Output, format: MkvOutputFormat) {
super(output);
@@ -1197,7 +1198,8 @@ export class MatroskaMuxer extends Muxer {
this.ebmlWriter.writeEBML(blockGroup);
}
this.duration = Math.max(this.duration, msTimestamp + msDuration);
this.startTimestamp = Math.min(this.startTimestamp, msTimestamp);
this.endTimestamp = Math.max(this.endTimestamp, msTimestamp + msDuration);
trackData.lastWrittenMsTimestamp = msTimestamp;
if (!this.trackDatasInCurrentCluster.has(trackData)) {
@@ -1325,7 +1327,10 @@ export class MatroskaMuxer extends Muxer {
this.ebmlWriter.writeVarInt(segmentSize, SEGMENT_SIZE_BYTES);
// Write the duration of the media to the Segment
this.segmentDuration!.data = new EBMLFloat64(this.duration);
const duration = this.startTimestamp === Infinity
? 0
: this.endTimestamp - this.startTimestamp;
this.segmentDuration!.data = new EBMLFloat64(duration);
this.writer.seek(this.ebmlWriter.offsets.get(this.segmentDuration!)!);
this.ebmlWriter.writeEBML(this.segmentDuration);