release-video

1# release-video
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3Two outputs per release:
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5- **Recap**: a 45-75 s motion video, one scene per shipped feature, vertical (1080x1920) by default.
6- **Explained demos**: one 30-60 s clip per feature, a real recording of the product with step captions, eased zoom on the payoff, and intro/outro cards (1920x1080).
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8Every frame of the recap is a pure function of time (`window.renderAt(t)` in `scripts/engine.js`), so a re-render is identical, renders split across workers, and any single frame can be pulled as a still for review before the full render.
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10This skill makes motion scenes and composes demos from recordings. It does not cut raw footage of people talking. For narrated takes, founder voice-overs or interviews, use [browser-use/video-use](https://github.com/browser-use/video-use), which cuts on word boundaries from a transcript, and drop the recap and demo clips into its folder as B-roll.
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12## Requirements
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14`ffmpeg`, Python 3 with `playwright`, `numpy`, `Pillow`, and `ELEVENLABS_API_KEY` for audio. If Playwright's bundled Chromium doesn't launch, point `CHROME_PATH` at any Chromium or headless-shell binary.
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16## Rules from review
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18These came from a real review of the first cut. Each one cost a full re-render when it was missed.
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201. **Sound comes from the motion.** Every sound effect is declared on the element that moves (`data-sfx="pop,0.5"`) and lands on that element's animation start. A looping background track as the only audio reads as filler.
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