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454476ab26
* Fix WebVTT-in-MP4 output by starting the aux writer The ISOBMFF muxer advertises WebVTT as a supported subtitle codec and maps it to the wvtt sample entry, but IsobmffMuxer.start() never calls auxWriter.start(). The aux writer builds subtitle sample boxes in memory, so the first box write for any subtitle track hits its started === false assert and muxing fails. Start the aux writer alongside the main writer so WebVTT subtitle tracks can be written to MP4/MOV. * Move code around, add simple WebVTT muxing test --------- Co-authored-by: hikari <[email protected]> Co-authored-by: Vanilagy <[email protected]>
58 lines
1.1 KiB
TypeScript
58 lines
1.1 KiB
TypeScript
import { test } from 'vitest';
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import { Output } from '../../src/output.js';
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import { MkvOutputFormat, Mp4OutputFormat } from '../../src/output-format.js';
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import { BufferTarget } from '../../src/target.js';
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import { TextSubtitleSource } from '../../src/media-source.js';
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test('ISOBMFF muxing', async () => {
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const output = new Output({
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format: new Mp4OutputFormat(),
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target: new BufferTarget(),
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});
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const source = new TextSubtitleSource('webvtt');
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output.addSubtitleTrack(source);
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await output.start();
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await source.add(`WEBVTT
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00:00.000 --> 00:00.900
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Hildy!
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00:01.000 --> 00:01.400
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How are you?
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00:01.500 --> 00:02.900
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Tell me, is the lord of the universe in?
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`);
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await output.finalize();
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});
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test('Matroska muxing', async () => {
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const output = new Output({
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format: new MkvOutputFormat(),
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target: new BufferTarget(),
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});
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const source = new TextSubtitleSource('webvtt');
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output.addSubtitleTrack(source);
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await output.start();
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await source.add(`WEBVTT
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00:00.000 --> 00:00.900
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Hildy!
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00:01.000 --> 00:01.400
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How are you?
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00:01.500 --> 00:02.900
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Tell me, is the lord of the universe in?
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`);
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await output.finalize();
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});
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