Giancarmine Salucci ffa931e959 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

2026-07-08 00:43:43 +02:00

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