Fix white flashes and blending problems between scenes in HyperFrames videos. This skill explains background setup, overlapping scene containers, final-frame holds, and timeline templates so transitions render with the intended appearance.
中文简介正在准备中。当前显示英语简介。
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.
安装前可以查看交给 AI 代理的指令内容。
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.
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.
At a break boundary between scene i (from) and scene i+1 (to), the
injector:
#el-<from> wrapper data-duration by duration_s (holds its final
frame — verified: core/src/runtime/init.ts:1393-1410 external-slot branch).#el-<to> wrapper data-start earlier by duration_s (creates the
overlap window).data-track-index as a 0/1 ping-pong so the two
overlapping wrappers never share a track (same-track overlap is illegal —
core/src/lint/rules/composition.ts). Higher track composites on top.gsap_template into window.__timelines["main"] at T = overlap-start.Verified by prototype render (2026-05-31): the master-timeline wrapper tween is seeked and rendered (no double-seek with the sub-comp's own paused timeline — the runtime drives them independently), the extended wrapper holds scene i's final frame, and the higher-track incoming wrapper composites over + blends with the outgoing one.
The injector substitutes these tokens in each gsap_template line:
| Token | Meaning |
|---|---|
__OLD__ | "#el-<from>" — outgoing clip wrapper selector (quoted) |
__NEW__ | "#el-<to>" — incoming clip wrapper selector (quoted) |
__T__ | overlap-start time in seconds (master clock) |
__DUR__ | duration_s for this boundary |
__DX__ | horizontal travel for directional types: -1920 (LEFT) / 1920 (RIGHT) |
__DY__ | vertical travel: -1080 (UP) / 1080 (DOWN) |
__ORIGIN_OUT__ / __ORIGIN_IN__ | transformOrigin pair for squeeze |
filter / scaleX / transformOrigin are lint-clean on the master timeline
(verified: core/src/lint/rules/gsap.ts has no per-property whitelist and scopes
its checks to data-composition-id ranges; the x/y/scale/rotation/opacity
whitelist is a scene-worker prompt rule only — it does not bind index.html).
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Create a 12-second title animation in HyperFrames, where sweeping leaves reveal two headlines. Customize typography, leaf counts, sweep speed, background color, and the breeze moving the leaves that remain on the text.
中文简介正在准备中。当前显示英语简介。
Plan subtitles as layers over a video, deciding which spoken phrases to omit, show normally, or emphasize behind the subject. The guidance preserves full-frame composition and limits large embedded words to occasional key moments.
中文简介正在准备中。当前显示英语简介。
Turn a weekly Markdown changelog into a branded video project with animated interface examples, Annie narration, captions, and background music. The workflow selects key updates and builds a 45–60 second square video, with rendering performed on request.
中文简介正在准备中。当前显示英语简介。
Add an eight-second HyperFrames headline animation where square tiles lift, tilt, and flip to reveal a second message. Customize both headlines and 18 settings covering tile size, sweep direction, timing, depth, bounce, and shadows.
中文简介正在准备中。当前显示英语简介。
Add a 3D card carousel to a HyperFrames video. Rounded cuboids enter from the right, rotate in sequence, pause on a featured card, and exit left, with 40 variables for content, geometry, lighting, and camera settings.
中文简介正在准备中。当前显示英语简介。
Design scene transitions and animated text using matched movement direction and speed across cuts. The catalog provides concrete settings for zooms, blur, word-by-word transitions, staggered entrances, and repositioning groups of elements.
中文简介正在准备中。当前显示英语简介。