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How to render an HTML motion graphic to a frame-exact video with Open Edit

Turn an HTML page with animations into a silent H.264 video, frame by frame.

  • Content
  • Intermediate
  • 60 minutes
  • From the README
  • Claude Code
  • Codex
  • Gemini CLI

Who it is forA designer or developer making a motion graphic, title card, or animated slide from HTML and CSS.

The problemBrowser animations often render unevenly when captured as video.

The outcomeA silent MP4 where each frame matches the page at that exact time, with a re-render option for one stretch.

What you need first

  • Node.js, so that npx can run @veedstudio/openedit-cli
  • A workspace folder for the project
  • FFmpeg, which install-ffmpeg can find or download
  • A VEED login for hosted transcription and the VEED editor handoff
  • A fal key (FAL_KEY) only for fal-billed models, background removal with --fal or --fast, and lipsync

Steps

  1. Write or save your animated page as page.html in the workspace.
  2. Run npx @veedstudio/openedit-cli render page.html --out out.mp4 --fps 30000/1001 --duration 12 to render the video.
  3. If one section is wrong, run npx @veedstudio/openedit-cli render page.html --out out.mp4 --from 4 --to 6 to re-render only that stretch.
  4. Run npx @veedstudio/openedit-cli mux-audio --video runs/<run>/out.mp4 --audio runs/<run>/audio/mix.m4a --out runs/<run>/final.mp4 only if you have a soundtrack to add. (inferred, check the README)

Prompt for your agent

In the veedstudio/open-edit repo, render <page.html> to out.mp4 with the render command and a duration matching the page timing. Expect a silent MP4 that matches the animation timing. Verify that the output is not a single flat colour before you deliver it.

Caveat. The README says the render tool fetches headless Chrome on first use, so the first run may take longer.

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