Node.js CLI tool using headless Chrome and ffmpeg to render deterministic scroll videos of web pages as H.264 1080p MP4s.
Key Takeaways
Captures PNG frames via headless Chrome DevTools, pipes them into ffmpeg; no npm runtime dependencies beyond Node.js 22.
Cue sheet scripting supports pauses, clicks, typing, zooms, highlights, and scroll-to-text targeting for complex demo recordings.
Default output: 1920x1080, 30fps, H.264 CRF 18; configurable via CLI flags including --speed, --duration, --width, --height.
Designed as an OpenAI Codex skill: plain-English prompts generate cue sheets, which Codex iterates on like editor notes.
Docker/sandbox users must handle Chromium --no-sandbox separately; cue step failures produce .error.json and .error.png debug artifacts.
Hacker News Comment Review
One commenter pointed out the whole thing can be approximated with a single ffmpeg crop filter on a full-page screenshot PNG, skipping Chrome entirely for static pages.
Notable Comments
@andrewstuart: Pure ffmpeg one-liner using animated crop filter on a screenshot PNG achieves similar output without any browser automation.