Seam Craft
Makes scene-to-scene transitions composite cleanly, fixing white flashes at cuts.
Install
npx skills add heygen-com/hyperframes --skill seam-craft -g -a claude-code -y- Repository
- heygen-com/hyperframes77.1k
- Category
- Media
- Updated
- 3d ago
- License
- Apache-2.0
- Context cost
- Lightabout 1,000 tokens
- Runs scripts
- No, instructions only
What it does
Render-correctness doctrine for scene-to-scene seams in HyperFrames launch videos, the prerequisites that make transitions composite correctly on the master timeline. Load when assembling the master timeline / index.html, when a white flash appears at a cut or crossfade seam (especially on dark films), when reasoning about why a transition opacity dip shows through, or when verifying the render-side mechanics of how overlapping scene wrappers blend. Covers the opaque stage-ground (#root background) white-flash guard and how the injector overlaps wrappers, holds final frames, ping-pongs tracks, and stamps lint-clean template code onto the master timeline. Does NOT contain the per-transition catalog, see the transition registry for individual transition entries.
Seam Craft, render prerequisites for scene-to-scene transitions
This is the render-correctness doctrine for PLV scene-to-scene seams: the prerequisites and master-timeline mechanics that make any transition composite correctly, independent of which specific transition is chosen. The per-transition catalog (crossfade, push-slide, zoom-through, cut-the-curve, …) lives in the transition registry, this page is the doctrine that sits underneath all of them.
The transitions this doctrine governs are Tier-B-ready: pure transform / opacity /
filter on the two scene clip wrappers (#el-<sid>), no injected overlay DOM, no
per-scene cooperation. Overlay families (staggered blocks, blinds, light leak, grid
dissolve, page burn) and shader transitions are deferred to later phases.
Stage ground prerequisite (white-flash guard)
Several templates open a window where the two wrappers' summed opacity < 1 (the
cut-the-curve mid-window cut, zoom-through's 0.15 floor, plain crossfade's
power-curve dip). Whatever is BEHIND the wrappers shows through during that
window. If the assembled index.html #root has no opaque background, the
renderer composites the dip over its default white page → a white flash at
every seam, glaring on dark films (observed on two Spotify runs before the fix).
The assembler must paint the stage: #root { background: var(--canvas-deep, var(--canvas, #000)) }, assemble-index.mjs now emits this;
any other consumer of these templates owns the same guarantee.
How the injector applies a transition
At a break boundary between scene i (from) and scene i+1 (to), the
injector:
