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[M4] Video Speed Adjustment via FFmpeg #31

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Milestone 4 — Playwright Test Video Integration | Priority: High | COMPLETED in PR #27

Apply speed adjustments from sync_map.json to Playwright test videos, integrate type: playwright_test into Composer.

  • Uniform speed via ffmpeg setpts filter
  • Piece-wise speed: split-retime-concat approach
  • WebM/MP4 fallback path resolution

Implemented in src/docgen/compose.py (_retime_video, _apply_uniform_speed, _apply_piecewise_speed). See issues/playwright-test-integration/04-video-speed-adjustment.md.

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