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feat(anki): mirror mpv software volume into generated sentence audio (#155)

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This commit is contained in:
Kyle Yasuda
2026-07-10 00:44:23 -07:00
committed by GitHub
parent 84c75f50aa
commit 7b1a005a65
31 changed files with 419 additions and 23 deletions
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src/media-generator.test.ts
+48
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@@ -181,6 +181,54 @@ test('generateAudio can preserve raw sentence audio loudness', async () => {
});
});
test('generateAudio applies mpv volume after loudness normalization', async () => {
await withStubbedFfmpeg(async (generator, argsPath) => {
await generator.generateAudio('/video.mp4', 10, 12, 0, null, true, 0.42);
const args = readFfmpegArgs(argsPath);
assert.equal(args[args.indexOf('-af') + 1], 'loudnorm=I=-23:TP=-2:LRA=11,volume=0.42');
});
});
test('generateAudio limits amplified mpv volume after applying gain', async () => {
await withStubbedFfmpeg(async (generator, argsPath) => {
await generator.generateAudio('/video.mp4', 10, 12, 0, null, true, 2);
const args = readFfmpegArgs(argsPath);
assert.equal(
args[args.indexOf('-af') + 1],
'loudnorm=I=-23:TP=-2:LRA=11,volume=2,alimiter=limit=0.891251:level=false',
);
});
});
test('generateAudio applies mpv volume without loudness normalization', async () => {
await withStubbedFfmpeg(async (generator, argsPath) => {
await generator.generateAudio('/video.mp4', 10, 12, 0, null, false, 0.75);
const args = readFfmpegArgs(argsPath);
assert.equal(args[args.indexOf('-af') + 1], 'volume=0.75');
});
});
test('generateAudio omits no-op mpv volume filters', async () => {
await withStubbedFfmpeg(async (generator, argsPath) => {
await generator.generateAudio('/video.mp4', 10, 12, 0, null, false, 1);
const args = readFfmpegArgs(argsPath);
assert.equal(args.includes('-af'), false);
});
});
test('generateAudio preserves a zero numeric mpv volume', async () => {
await withStubbedFfmpeg(async (generator, argsPath) => {
await generator.generateAudio('/video.mp4', 10, 12, 0, null, false, 0);
const args = readFfmpegArgs(argsPath);
assert.equal(args[args.indexOf('-af') + 1], 'volume=0');
});
});
test('generateAudio clips leading padding without adding it to trailing duration', async () => {
await withStubbedFfmpeg(async (generator, argsPath) => {
await generator.generateAudio('/video.mp4', 0.2, 1.2, 0.5);