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* feat(studio): drag keyframes with beat snapping Keyframe diamonds are draggable with live preview and snap to the music beat grid (requires VITE_STUDIO_ENABLE_KEYFRAMES=1). Drag model: a tween start point trims the front (end fixed), an end point resizes (start fixed), an intermediate keyframe moves within the tween (adjacent segments resize, others untouched; start/end moves remap the intermediates to preserve their absolute times). The keyframe snaps to the nearest beat within ~8px, centered exactly on the dot. Reliability: the commit resolves the dragged element's selection + parsed animations on demand (awaited) instead of relying on the async DOM-edit session, picks the tween whose window contains the keyframe's original time among same-group tweens, and holds the dropped position optimistically until the cache round-trip lands. Cache clip% precision raised to 0.001% so the marker lands exactly where dropped. Pure match/plan logic + unit tests in editor/keyframeMove.ts. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-authored-by: Miguel Ángel <miguel07alm@protonmail.com> * fix(studio): harden keyframe drag commit (review follow-ups) - pickKeyframeTween no longer falls back to ALL animations on a selector mismatch — it only picks among the dragged element's own tweens, so a class/compound-selector mismatch can't edit a different element. No match → no-op. - computeKeyframeMovePlan bails to a no-op when a keyframe-array tween's dragged keyframe can't be located (stale cache / precision drift) instead of falling through to an end-point resize that silently rescaled the whole tween and re-timed every keyframe. - usePopulateKeyframeCacheForFile clipPct now uses 0.001% precision (matching useGsapAnimationsForElement) so beat-snapped keyframes from the file-wide cache also center on the dot and the two caches agree. - The optimistic drag hold only releases once the cache reflects the committed position (a keyframe near the held %), so an unrelated cache rebuild no longer flashes the diamond back to its old spot. - A drag's document listeners are cleaned up on unmount, so an unmount mid-drag (clip delete / comp switch / zoom-out) no longer leaks them. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-authored-by: Miguel Ángel <miguel07alm@protonmail.com> * feat(studio): shrink + lower keyframe diamonds under the beat strip When a clip's track shows the beat-dot strip (the top band), its keyframe diamonds and connecting lines render at 45% size and centered in the region below the band, so they don't collide with the dots. Full size and vertically centered otherwise. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-authored-by: Miguel Ángel <miguel07alm@protonmail.com> * fix(studio): ignore keyframe re-drag during the optimistic-hold window After a drop, the diamond is held at its dropped position (via effPct) until the file round-trip lands, but `pct` passed to handlePointerDown still comes from props (the pre-drop position). Re-grabbing the same keyframe in that window would track the drag from a stale origin and commit against the wrong tween (or no-op via the stale-cache guard). Skip starting a drag while a hold is pending; it clears on the cache match (≤2s fallback). Click selection is unaffected. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-authored-by: Miguel Ángel <miguel07alm@protonmail.com> --------- Co-authored-by: Miguel Ángel <miguel07alm@protonmail.com>
@hyperframes/studio
Browser-based composition editor UI for Hyperframes. Provides a visual timeline, code editor, and live preview for building video compositions.
Install
npm install @hyperframes/studio
What it does
The studio is a React application with:
- Visual timeline — drag, resize, and arrange elements on tracks
- Code editor — edit HTML and GSAP scripts with CodeMirror (syntax highlighting, autocomplete)
- Live preview — see changes in real time as you edit
- Composition inspector — view and modify element properties
Development
The studio is embedded in the hyperframes preview command. To develop the studio UI itself:
cd packages/studio
bun run dev # Start Vite dev server
bun run build # Build for production
bun run typecheck # Type-check
Tech stack
- React 18/19, Zustand (state management)
- CodeMirror 6 (editor)
- Tailwind CSS (styling)
- Vite (bundler)
- Phosphor Icons
Documentation
Full documentation: hyperframes.heygen.com/packages/studio
Related packages
@hyperframes/core— types and parsers used by the editorhyperframes— CLI that serves the studio viahyperframes preview