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Cut and animate to the music — get beats/onsets with analyze_audio, then land cuts and zoom/scale punches on the beat.
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Master motion-designer playbook for composing premium films with compose_motion — the decision process, optical composition, rhythm, restraint, transition craft, the physics of premium motion, worked examples with the reasoning exposed, and the failure modes to avoid. Read this BEFORE composing any motion piece (launch film, product reel, title sequence, brand sting).
Plan and place B-roll cutaways over an A-roll talking track — from the media library or generated (BYOK).
The non-negotiable way to work — build every edit ON the Kaestral timeline via MCP tools so the user watches it happen, and render only with Kaestral's own Export. Read this before any editing task.
Apply modern short-form caption looks — word-pop, karaoke highlight, bold-boxed, typewriter — sized and placed for 9:16.
Give a clip or project a cohesive designed look — extract the palette, build a color grade, and choose on-brand type and captions.
Package the finished edit for each platform — Reels/TikTok/Shorts (9:16), feed (1:1), YouTube (16:9) — with the right aspect, safe areas, duration, and captions, then export from Kaestral.
| name | Beat-synced cutting |
| description | Cut and animate to the music — get beats/onsets with analyze_audio, then land cuts and zoom/scale punches on the beat. |
Follow the build-in-kaestral house rule: every cut and keyframe happens ON the Kaestral timeline via tools, and any music you add is imported and placed (import_media + add_clips) — never rendered outside Kaestral. Finish with export_project(mode:"video").
Make the edit feel locked to the track. Kaestral's analyze_audio returns beats/onsets in PROJECT FRAMES, so you can place cuts and keyframes exactly on them.
get_media / get_timeline).analyze_audio with its mediaRef (or a clipId). You get back:
tempoBpm — estimated tempo,beatFrames — a clean tempo grid (evenly spaced beats),onsetFrames — actual detected transients (hits, kicks, snaps),fps — the project fps the frames are in.beatFrames for a steady, musical cadence. Use onsetFrames when you want to hit specific accents (a drop, a vocal stab).beatFrames (or every 2nd/4th beat for a slower feel), place the next clip's cut at that frame. Use split_clips to slice and move_clips / add_clips to align clip starts to beat frames.set_keyframes scale punch (1.0 → ~1.1 → 1.0 over ~4–6 frames) centered on strong beats/onsets for a "bounce."opacity/position for flashes and slides synced to onsets.tempoBpm tells you the spacing: frames-per-beat ≈ fps * 60 / tempoBpm. Cut on every beat (fast), half-beat (very fast), or every 2–4 beats (relaxed).tempoBpm came back 0 or looks wrong (very quiet or arrhythmic audio), fall back to onsetFrames for cut points, or cut by feel.analyze_audio is an energy-flux/tempo estimator — excellent for percussive music, weaker on ambient/legato tracks. Sanity-check against the waveform.