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How to check beat sync and mix balance of a motion video with Motion Video Skill

Run the bundled Python checks on a project to find splice drift and a music-to-speech imbalance.

  • Content
  • Advanced
  • 60 minutes
  • From the README
  • Any agent

Who it is forA video editor or developer who has a motion video project and needs proof the music and speech levels are right before publishing.

The problemMusic that drifts off the beat or sits too loud under speech is easy to miss when watching a render.

The outcomeReports showing splice lag per segment, music level under speech versus the gaps, and the beat grid used.

What you need first

  • Node.js 20+
  • Python 3.10+ with numpy and scipy
  • ffmpeg and ffprobe on PATH
  • The multix CLI, authenticated with a Gemini key and an ElevenLabs key
  • npx --yes [email protected] (no install step needed)

Steps

  1. Install the skill with npx skills add bestagentkits/motion-video-skill.
  2. Install the Python requirements, numpy and scipy, and confirm ffmpeg and ffprobe are on PATH.
  3. Run python skills/motion-video/scripts/verify-arrangement.py on the project and read the per-segment splice lag; it exits 1 on drift. (inferred, check the README)
  4. Run python skills/motion-video/scripts/measure-mix-balance.py on the project and check music sits about 4 to 6 dB under speech. (inferred, check the README)
  5. Run python -m unittest discover -s skills/motion-video/scripts/tests to confirm the checker itself passes.

Prompt for your agent

Using the motion-video skill from bestagentkits/motion-video-skill, run verify-arrangement.py and measure-mix-balance.py on the project at <project-path> and report each music segment's splice lag and the music-to-speech level difference. Expected output is a short pass or fail report. Verify that every segment is within ±2 ms of its target beat and that music is about 4 to 6 dB under speech.

Caveat. The README does not document the command-line arguments for the Python scripts, so check each script's usage before running it on a real project.

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