Open-source Skill turns your codebase into a product promo video — React rendering, Python-synthesized music
歸藏的AI工具箱 · wechat · 2026-09-19
Guizang open-sourced guizang-product-video-skill, packaging the workflow he used with GPT-6 Astra to make product promo videos — pure code rendering, no video generation models.
How it works:
- The Skill reads your repo to find components, styles, fonts, logos and color schemes, then imports real React components rendered in Playwright — not screenshots; state changes are driven by the components' own props.
- Music is pure Python waveform synthesis: sine waves layered into tones, arranged by chord progressions, with precise control over swells, endings and beat-synced cuts.
- 11 built-in sound effects with sidechain ducking: music ducks 3-6dB within 40ms when a sound plays, then smoothly recovers.
- Auto QA pass checks cropping, font loading, A/V sync, timeline gaps and audio clipping, with auto-fix and re-export.
- Products without a design language can use the built-in warm-white/charcoal default; otherwise it adopts your codebase's own style.
Usage: install via npx skills add (auto-checks Node/Python/FFmpeg/Playwright), then ask it to turn the last three weeks of updates into a promo — you get an editable video project, not a one-shot MP4.
Takeaway: in context-rich verticals like your own codebase, code-rendered video already matches competent-human delivery quality, and its editability is something generative models can't easily replace — content production is at a fork between generation and code/tool routes.
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