cycle-atlas/.claude/skills/hyperframes-cli/references/beats.md

Generate a project beat grid

Use hyperframes beats when an existing HyperFrames project needs the Studio-compatible beat file for its music track. This is a CLI utility, not a complete video workflow.

npx hyperframes beats
npx hyperframes beats ./my-video
npx hyperframes beats ./my-video --json

The project must contain a local music <audio> source. Mark it with data-timeline-role="music"; an id containing music, bgm, or soundtrack is also recognized. The command decodes that file with ffmpeg, tracks its beats, and writes beats/<audio-relative-path>.json.

If the track has no steady beat, the command fails and writes nothing. If ffmpeg is missing, run npx hyperframes doctor.

For a whole video cut to a music track, see /hyperframes → references/film.md.