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Improve ISOBMFF demuxer to support fragments without a key frame

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Vanilagy
2025-07-11 10:57:24 +02:00
parent 514a533445
commit 14ad80df5d
2 changed files with 52 additions and 31 deletions
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src/matroska/matroska-demuxer.ts
+7 -12
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@@ -484,24 +484,18 @@ export class MatroskaDemuxer extends Demuxer {
.map((block, i) => ({ timestamp: block.timestamp, blockIndex: i }))
.sort((a, b) => a.timestamp - b.timestamp);
let hasKeyFrame = false;
for (let i = 0; i < trackData.presentationTimestamps.length; i++) {
const entry = trackData.presentationTimestamps[i]!;
const block = trackData.blocks[entry.blockIndex]!;
const currentEntry = trackData.presentationTimestamps[i]!;
const currentBlock = trackData.blocks[currentEntry.blockIndex]!;
if (block.isKeyFrame) {
hasKeyFrame = true;
if (trackData.firstKeyFrameTimestamp === null && block.isKeyFrame) {
trackData.firstKeyFrameTimestamp = block.timestamp;
}
if (trackData.firstKeyFrameTimestamp === null && currentBlock.isKeyFrame) {
trackData.firstKeyFrameTimestamp = currentBlock.timestamp;
}
if (i < trackData.presentationTimestamps.length - 1) {
// Update block durations based on presentation order
const nextEntry = trackData.presentationTimestamps[i + 1]!;
const nextBlock = trackData.blocks[nextEntry.blockIndex]!;
block.duration = nextBlock.timestamp - block.timestamp;
currentBlock.duration = nextEntry.timestamp - currentBlock.timestamp;
}
}
@@ -520,6 +514,7 @@ export class MatroskaDemuxer extends Demuxer {
);
track.clusters.splice(insertionIndex + 1, 0, cluster);
const hasKeyFrame = trackData.firstKeyFrameTimestamp !== null;
if (hasKeyFrame) {
const insertionIndex = binarySearchLessOrEqual(
track.clustersWithKeyFrame,
@@ -1210,7 +1205,7 @@ abstract class MatroskaTrackBacking implements InputTrackBacking {
correctBlockFound: true,
};
} else {
// Walk the list of clusters until we find the next cluster for this track
// Walk the list of clusters until we find the next cluster for this track with a key frame
let currentCluster = locationInCluster.cluster;
while (currentCluster.nextCluster) {
currentCluster = currentCluster.nextCluster;