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video-to-css

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Rebuild a reference video (any container ffmpeg reads: mp4, mov, webm, gif; any size, aspect, rotation or frame rate; a loop or a one-shot, or a window of a longer clip) as an editable strict HTML/CSS animation: semantic DOM parts, CSS keyframes matched to the clip's real timestamps, runtime custom-property controls, and browser evidence (matched-time side-by-sides, separate appearance/temporal reports, negative controls, strict audit). Use when asked to turn a video/GIF/screen recording into CSS animation, to match an animation's timing in CSS, or to verify a CSS animation against a reference clip. Not for: canvas/WebGL/SVG/Lottie output, JS animation libraries, embedding the video or its frames, or naturalistic footage (faces, fluids, crowds) where strict CSS is a poor fit — say so.

skills/video-to-css/SKILL.md

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11
Repository last updated
Oct 28, 2026
License
MIT

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# video-to-css

Turn a reference clip into a **strict HTML/CSS** scene whose motion is declared in CSS and whose
playback needs no JavaScript, then prove — with the toolkit in `scripts/` — what matches and what
does not. The deliverable is a construction system with controls, not a pixel replay.

## Setup (once)

```bash
cd <this skill>/scripts && npm install      # playwright@1.64.1 + pngjs@7.0.0, pinned
npx playwright install chromium             # webkit optional for smoke coverage
# needs ffmpeg + ffprobe on PATH and Node >= 20
node v2css.mjs help
```
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