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Big realtime playback refactor

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- Added Worker- or AudioContext-based fallbacks in case MediaStreamTrackProcessor is not available
- Fixed fMP4-streamed files not playing in Safari
- Added better error handling for MediaStream sources
- Improved the live recording example to be more robust
This commit is contained in:
Vanilagy
2025-07-27 12:13:03 +02:00
parent 9cc38329f2
commit d38ad22559
12 changed files with 690 additions and 268 deletions
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src/isobmff/isobmff-muxer.ts
+13 -6
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@@ -32,6 +32,7 @@ import {
transformAnnexBToLengthPrefixed,
} from '../codec-data';
import { buildIsobmffMimeType } from './isobmff-misc';
import { MAX_BOX_HEADER_SIZE, MIN_BOX_HEADER_SIZE } from './isobmff-reader';
export const GLOBAL_TIMESCALE = 1000;
const TIMESTAMP_OFFSET = 2_082_844_800; // Seconds between Jan 1 1904 and Jan 1 1970
@@ -989,10 +990,7 @@ export class IsobmffMuxer extends Muxer {
const moofOffset = this.writer.getPos();
const mdatStartPos = moofOffset + this.boxWriter.measureBox(moofBox);
// Header with large size. We always reserve 16 bytes for it even if we don't end up using the large size.
const mdatHeaderSize = 16;
let currentPos = mdatStartPos + mdatHeaderSize;
let currentPos = mdatStartPos + MIN_BOX_HEADER_SIZE;
let fragmentStartTimestamp = Infinity;
for (const trackData of tracksInFragment) {
trackData.currentChunk!.offset = currentPos;
@@ -1006,6 +1004,15 @@ export class IsobmffMuxer extends Muxer {
}
const mdatSize = currentPos - mdatStartPos;
const needsLargeMdatSize = mdatSize >= 2 ** 32;
if (needsLargeMdatSize) {
// Shift all offsets by 8. Previously, all chunks were shifted assuming the large box size, but due to what
// I suspect is a bug in WebKit, it failed in Safari (when livestreaming with MSE, not for static playback).
for (const trackData of tracksInFragment) {
trackData.currentChunk!.offset! += MAX_BOX_HEADER_SIZE - MIN_BOX_HEADER_SIZE;
}
}
if (this.format._options.onMoof) {
this.writer.startTrackingWrites();
@@ -1025,11 +1032,11 @@ export class IsobmffMuxer extends Muxer {
this.writer.startTrackingWrites();
}
const mdatBox = mdat(mdatSize >= 2 ** 32);
const mdatBox = mdat(needsLargeMdatSize);
mdatBox.size = mdatSize;
this.boxWriter.writeBox(mdatBox);
this.writer.seek(mdatStartPos + mdatHeaderSize);
this.writer.seek(mdatStartPos + (needsLargeMdatSize ? MAX_BOX_HEADER_SIZE : MIN_BOX_HEADER_SIZE));
// Write sample data
for (const trackData of tracksInFragment) {