JamesandClaude Opus 4.6 a146c9e527 test(render): add WebM regression test and getEncoderPreset unit tests ...

- New regression test `webm-transparency`: minimal transparent composition
  rendered to WebM, validates VP9 codec and visual quality at 100
  checkpoints against golden baseline
- Extend regression harness: `renderConfig.format` field ("mp4" | "webm"),
  format-aware output paths and snapshot filenames
- Fix `extractMonoPcm16` to gracefully handle videos without audio
  streams (WebM without audio was throwing instead of returning empty)
- Unit tests for `getEncoderPreset()`: VP9/yuva420p for WebM,
  h264/yuv420p for MP4, preset mapping, quality preservation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-27 02:19:43 +00:00

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test(render): add WebM regression test and getEncoderPreset unit tests

2026-03-27 02:19:43 +00:00