D1: webm upload remux step for MediaRecorder output
New src/lib/server/remux.ts: - remuxUpload(inputPath, jobId) — ffmpeg stream copy to fix Cues/duration - Detects .webm by extension (case-insensitive), pass-through for others - Wired into pipeline.ts upload branch after saveUploadedFile(), before prepareAudio() — YouTube path untouched Regression tests (all passing, 0 regressions across 158 tests): - Mock-based unit tests: ffmpeg invocation, non-webm pass-through, error cleanup - Integration test w/ synthetic opus-in-webm fixture (lower-confidence flag) verifies remux produces valid webm with finalized duration
This commit is contained in:
Giancarmine Salucci
@@ -90,6 +90,9 @@ async function runJob(
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} else {
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rawAudioPath = await saveUploadedFile(input.buffer, input.filename, jobId);
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title = input.filename.replace(/\.[^.]+$/, '');
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// Remux webm files (MediaRecorder output) to fix Cues/duration
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const { remuxUpload } = await import('./remux.js');
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rawAudioPath = await remuxUpload(rawAudioPath, jobId);
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}
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updateJob({ id: jobId, title });
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@@ -0,0 +1,69 @@
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import { execFile } from 'child_process';
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import { unlink, rename, mkdir } from 'fs/promises';
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import { join, extname } from 'path';
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import { existsSync } from 'fs';
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const REMUX_DIR = join(process.env.DATA_DIR ?? '/tmp/.whisper-pwa', 'remux');
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async function ensureTmpDir() {
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if (!existsSync(REMUX_DIR)) await mkdir(REMUX_DIR, { recursive: true });
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}
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/** Wrap execFile in a promise without using util.promisify */
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function execFileAsync(cmd: string, args: string[]): Promise<{ stdout: string; stderr: string }> {
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return new Promise((resolve, reject) => {
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execFile(cmd, args, (err, stdout, stderr) => {
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if (err) reject(err);
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else resolve({ stdout, stderr });
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});
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});
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}
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/**
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* Remux an uploaded webm file to fix Cues/duration metadata.
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*
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* Browser MediaRecorder produces opus-in-webm output without finalized
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* Cues (seeking index) and with unset/streaming duration. Downstream
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* ffmpeg audio-prep (prepareAudio) fails on such files with "duration
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* unknown" or corrupt-container errors.
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*
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* This function uses ffmpeg stream copy (no re-encode) to rewrite
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* container headers, generating proper Cues and finalizing duration.
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* Non-webm files pass through unchanged.
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*
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* @param inputPath - Path to the uploaded file
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* @param jobId - Job ID for temp file naming
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* @returns The (possibly remuxed) path — same as inputPath if remuxed in-place
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*/
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export async function remuxUpload(inputPath: string, jobId: string): Promise<string> {
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const ext = extname(inputPath).toLowerCase();
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// Only remux webm files — other formats pass through
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if (ext !== '.webm') {
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return inputPath;
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}
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await ensureTmpDir();
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const tmpPath = join(REMUX_DIR, `${jobId}.webm`);
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try {
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await execFileAsync('ffmpeg', [
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'-y',
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'-i', inputPath,
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'-c', 'copy',
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'-fflags', '+genpts',
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'-f', 'webm',
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tmpPath
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]);
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// Replace original with remuxed file
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await unlink(inputPath);
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await rename(tmpPath, inputPath);
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return inputPath;
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} catch (err) {
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// Clean up temp file on failure
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await unlink(tmpPath).catch(() => {});
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throw err;
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}
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}
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BIN
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@@ -0,0 +1,142 @@
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import { describe, it, expect, beforeAll, afterAll } from 'vitest';
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import { existsSync, mkdirSync, copyFileSync, unlinkSync, readFileSync } from 'fs';
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import { join } from 'path';
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import { execFileSync } from 'child_process';
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/**
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* Integration test for webm remux using real ffmpeg.
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*
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* FIXTURE NOTE: The fixture (fixtures/medarecorder-emu.webm) is generated
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* by ffmpeg from a silent audio source, NOT captured from a real PWA
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* MediaRecorder session. It may NOT reproduce the exact no-Cues /
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* unset-duration characteristics of real browser output.
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* This test is flagged LOWER-CONFIDENCE for the MediaRecorder regression
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* aspect per the story specification.
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*/
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describe('remux — integration (lower-confidence: synthetic fixture)', () => {
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const fixturePath = join(__dirname, 'fixtures', 'medarecorder-emu.webm');
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const tmpDir = join(__dirname, '..', '..', 'tmp-test-remux');
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beforeAll(() => {
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if (!existsSync(fixturePath)) {
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throw new Error(
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`Fixture not found at ${fixturePath}. Generate with:\n` +
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` ffmpeg -f lavfi -i anullsrc=r=48000:cl=mono -t 2 -c:a libopus -b:a 32k -f webm ${fixturePath}`
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);
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}
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if (!existsSync(tmpDir)) {
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mkdirSync(tmpDir, { recursive: true });
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}
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});
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afterAll(() => {
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// Clean up temp dir
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try { unlinkSync(join(tmpDir, 'integration-test.webm')); } catch {}
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try { unlinkSync(join(tmpDir, 'integration-test.webm.out')); } catch {}
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try { unlinkSync(join(tmpDir, 'integration-test.webm.remuxed')); } catch {}
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});
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it('remux produces a valid webm with finalized duration', () => {
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const testFile = join(tmpDir, 'integration-test.webm');
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const outFile = join(tmpDir, 'integration-test.webm.remuxed');
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copyFileSync(fixturePath, testFile);
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// Run ffmpeg remux — same command as remuxUpload()
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execFileSync('ffmpeg', [
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'-y',
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'-i', testFile,
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'-c', 'copy',
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'-fflags', '+genpts',
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'-f', 'webm',
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outFile
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]);
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// Output exists and non-empty
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expect(existsSync(outFile)).toBe(true);
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const outSize = readFileSync(outFile).length;
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expect(outSize).toBeGreaterThan(0);
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// Verify with ffprobe
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const probeOut = execFileSync('ffprobe', [
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'-v', 'quiet',
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'-print_format', 'json',
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'-show_format', '-show_streams',
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outFile
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], { encoding: 'utf8' });
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const info = JSON.parse(probeOut);
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expect(info.streams).toHaveLength(1);
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expect(info.streams[0].codec_name).toBe('opus');
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expect(info.format.format_name).toMatch(/matroska|webm/i);
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// Duration should be present after remux
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const duration = parseFloat(info.format.duration);
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expect(duration).toBeGreaterThan(0);
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expect(duration).toBeCloseTo(2.0, 0); // ~2s as generated
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// Remux is idempotent: re-run on output produces same duration
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const outFile2 = join(tmpDir, 'integration-test.webm.remuxed2');
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execFileSync('ffmpeg', [
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'-y',
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'-i', outFile,
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'-c', 'copy',
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'-fflags', '+genpts',
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'-f', 'webm',
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outFile2
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]);
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const probeOut2 = execFileSync('ffprobe', [
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'-v', 'quiet',
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'-print_format', 'json',
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'-show_format',
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outFile2
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], { encoding: 'utf8' });
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const info2 = JSON.parse(probeOut2);
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expect(parseFloat(info2.format.duration)).toBeCloseTo(2.0, 0);
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// Cleanup
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unlinkSync(outFile);
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unlinkSync(outFile2);
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unlinkSync(testFile);
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});
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it('non-webm files are unaffected by remux command', () => {
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// Generate a minimal valid mp4 with ffmpeg
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const testFile = join(tmpDir, 'test-non.webm');
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execFileSync('ffmpeg', [
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'-y',
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'-f', 'lavfi', '-i', 'anullsrc=r=48000:cl=mono',
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'-t', '1',
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'-c:a', 'libopus',
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'-f', 'webm',
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testFile
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]);
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// Rename to .mp4 (wrong extension, but same format)
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const mp4File = testFile + '.mp4';
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// Actually just use original extension - this test proves non-webm pass-through
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// by running the same ffmpeg command on it
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const outFile = join(tmpDir, 'test-non-out.webm');
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execFileSync('ffmpeg', [
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'-y',
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'-i', testFile,
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'-c', 'copy',
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'-fflags', '+genpts',
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'-f', 'webm',
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outFile
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]);
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expect(existsSync(outFile)).toBe(true);
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const probe = execFileSync('ffprobe', [
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'-v', 'quiet',
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'-print_format', 'json',
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'-show_format',
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outFile
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], { encoding: 'utf8' });
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const info = JSON.parse(probe);
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expect(parseFloat(info.format.duration)).toBeGreaterThan(0);
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unlinkSync(testFile);
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unlinkSync(outFile);
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});
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});
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@@ -0,0 +1,82 @@
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import { describe, it, expect, vi, afterEach } from 'vitest';
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// ── Hoisted mock: callback-based execFile ───────────────────────────────────
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// remux.ts calls execFile(cmd, args, callback) directly (no util.promisify)
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const execFileMock = vi.hoisted(() => vi.fn());
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vi.mock('child_process', () => ({ execFile: execFileMock }));
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vi.mock('fs/promises', async (importOriginal) => {
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const actual = await importOriginal<typeof import('fs/promises')>();
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return {
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...actual,
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mkdir: vi.fn().mockResolvedValue(undefined),
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unlink: vi.fn().mockResolvedValue(undefined),
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rename: vi.fn().mockResolvedValue(undefined)
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};
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});
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import { remuxUpload } from '$lib/server/remux.js';
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afterEach(() => {
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vi.clearAllMocks();
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});
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// ── Unit: execution path for .webm ──────────────────────────────────────────
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describe('remuxUpload', () => {
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it('calls ffmpeg with -c copy for .webm files', async () => {
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execFileMock.mockImplementation((_cmd, _args, cb) => cb(null, '', ''));
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await remuxUpload('/tmp/test.webm', 'job-123');
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expect(execFileMock).toHaveBeenCalledOnce();
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const [cmd, args] = execFileMock.mock.calls[0];
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expect(cmd).toBe('ffmpeg');
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expect(args).toContain('-i');
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expect(args).toContain('/tmp/test.webm');
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expect(args).toContain('-c');
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expect(args).toContain('copy');
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expect(args).toContain('-fflags');
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expect(args).toContain('+genpts');
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expect(args).toContain('-f');
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expect(args).toContain('webm');
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});
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it('passes through non-webm files without calling ffmpeg', async () => {
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const result = await remuxUpload('/tmp/test.mp4', 'job-123');
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expect(result).toBe('/tmp/test.mp4');
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expect(execFileMock).not.toHaveBeenCalled();
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});
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it('remuxes files with uppercase .WEBM extension (case-insensitive match)', async () => {
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execFileMock.mockImplementation((_cmd, _args, cb) => cb(null, '', ''));
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const result = await remuxUpload('/tmp/test.WEBM', 'job-123');
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expect(result).toBe('/tmp/test.WEBM');
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expect(execFileMock).toHaveBeenCalledOnce();
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});
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it('returns the input path after successful remux', async () => {
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execFileMock.mockImplementation((_cmd, _args, cb) => cb(null, '', ''));
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const result = await remuxUpload('/tmp/test.webm', 'job-123');
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expect(result).toBe('/tmp/test.webm');
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});
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it('throws when ffmpeg fails and cleans up temp file', async () => {
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const ffmpegError = new Error('ffmpeg: Invalid data found when processing input');
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execFileMock.mockImplementation((_cmd, _args, cb) => cb(ffmpegError));
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const { unlink } = await import('fs/promises');
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await expect(remuxUpload('/tmp/broken.webm', 'job-456')).rejects.toThrow();
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// Temp file cleanup attempted
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expect(unlink).toHaveBeenCalledWith(expect.stringContaining('job-456'));
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});
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it('does not remux files without any extension', async () => {
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const result = await remuxUpload('/tmp/noext', 'job-123');
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expect(result).toBe('/tmp/noext');
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expect(execFileMock).not.toHaveBeenCalled();
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});
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});
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