heygen-com/hyperframes11 files

Hyperframes Core

Name: Hyperframes Core
Availability: InStock
Author: heygen-com

The HyperFrames composition contract — build one renderable project. Use for composition structure, the `data-*` timing attributes, `class="clip"`, tracks, sub-compositions, variables, framework-owned media playback, deterministic-render rules, and validation. Read before writing composition HTML.

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Specification

Skill ID: heygen-com/hyperframes/hyperframes-core
Publisher: heygen-com
Repository: hyperframes
Installs: 7,999
Files: 11
Synced: Sep 16, 2026

How to use it

Open any RiverX project, open the Skills panel in the chat, and search for this identifier. The files are fetched from the source repository at install time.

heygen-com/hyperframes/hyperframes-coreInstalls these files

references/composition-patterns.md
references/creator-editing-recipes.md
references/data-attributes.md
references/determinism-rules.md
references/full-screen-motion.md
references/minimal-composition.md
references/sub-compositions.md
references/tailwind.md
references/tracks-and-clips.md
references/variables-and-media.md
SKILL.md

What this skill tells the agent

HyperFrames Core

Agent pitfalls (read first):

Center with flex/inset, not CSS transform: translate(-50%,-50%) on a node you then GSAP x/y. Lint: gsap_css_transform_conflict. Use fromTo or xPercent/yPercent.
Do not add a scene-exit tl.set(..., {visibility:"hidden"}). The runtime already hides timed clips. Opacity fades on inner nodes (or opacity on .clip) are enough. Caption hard-kills are a different rule.
window.__timelines["id"] must match the root data-composition-id.
After render, read the summary's second line: beginframe vs screenshot, GPU mode, stage timings. screenshot + software gpu on Linux is the slow path.

HyperFrames renders video from HTML. A composition is an HTML file whose DOM declares timing with data-* attributes, whose animation runtime is seekable, and whose media playback is owned by the framework.

This skill is the technical contract — how to build one hyperframes project. The body below is the build guide; per-topic detail lives in references/ (index next), read on demand. Process docs (brief, storyboard, review, production, dispatch, frame-worker) live in /hyperframes → references/. Other concerns live in the sibling domain skills — hyperframes-animation, hyperframes-creative, media-use, hyperframes-cli, hyperframes-registry. The capability map in /hyperframes says what each one covers.

References

File	Read it to…
`references/minimal-composition.md`	start from the smallest renderable composition skeleton
`references/composition-patterns.md`	choose monolithic vs modular; structure a modular `index.html`; pick a sub-comp archetype
`references/data-attributes.md`	look up any `data-*` (root / clip / sub-comp host / legacy aliases); use `class="clip"`
`references/tracks-and-clips.md`	understand what `data-track-index` does (and does not) control, z-index, time a clip relative to another
`references/creator-editing-recipes.md`	copy truthful cut/trim/reorder/retime/freeze/camera/mask/crossfade/audio editing recipes and their limits
`references/sub-compositions.md`	wire a sub-composition (host attrs, `<template>`, per-instance vars) and animate inside it
`references/variables-and-media.md`	declare variables; place `<video>`/`<audio>`, set volume, trim
`references/determinism-rules.md`	build a seekable timeline; determinism bans; layout / text fit
`references/full-screen-motion.md`	author full-frame motion with shared backgrounds
`references/tailwind.md`	work in a Tailwind v4 project (`init --tailwind`; runtime contract differs from Studio's v3)

For animation runtime specifics (GSAP API, Lottie, Three.js, etc.) go to hyperframes-animation → adapters/<runtime>.md.

Building a composition

Two root forms (not interchangeable)

Standalone (top-level index.html): root <div data-composition-id="…"> sits directly in <body>, no `<template>` wrapper. Wrapping a standalone root hides all content and lint rejects it (standalone_composition_wrapped_in_template, error).
Sub-composition (loaded via data-composition-src): wrap the root in <template>. This is the shape to write: the loader also accepts a plain full document and falls back to its <body>, but the templated form is what the examples and tooling assume.

⚠ Transport rule: for a templated sub-composition the assembler drops the file's own <head> <style>/<script> (packages/core/src/compiler/compositionAssembly.ts, the hasTemplate gate), so put <style>/<script> inside the template. <link> is hoisted either way. ⚠ Host-id convention: give the host slot, the inner template, and the window.__timelines["<id>"] key the same id. A different local id is supported (the assembler falls back to the first root in the file) but the mismatch is silent, so match them unless you have a reason not to.

File shape, host wiring, and the pre-render checklist → references/sub-compositions.md.

Root must be sized (silent layout bug)

The standalone root authors width/height: 100%. Canvas size is data-width/data-height. The runtime stamps those pixels onto the composition root. Do not hardcode 1920px/1080px on #root. Skeleton → references/minimal-composition.md.

One paused timeline

Each composition registers exactly one gsap.timeline({ paused: true }) at window.__timelines["<id>"] (key = root data-composition-id). Building it inside an async callback (document.fonts.ready) is supported; what matters is that you register only after the build completes. Render length is the root's data-duration, not the timeline's length: a timeline that runs past it is cut off, and one that ends early holds its last frame. Omit the root data-duration and the length is inferred instead (timeline, media window, or adapter). You do not need window.__timelines = window.__timelines || {}: the runtime creates the registry before your inline scripts run, and lint no longer asks for it. Don't manually nest sub-timelines into the host; the runtime auto-nests registered child timelines. Full contract (incl. non-GSAP runtimes) → references/determinism-rules.md + hyperframes-animation/adapters/.

First-pass lint gotchas (a guaranteed first build failure)

Rules that lint does catch, but only after the fact. Write them right the first time:

Never pair a CSS initial transform with a GSAP tween on the same property — the CSS value and the tween's start fight and lint rejects it with gsap_css_transform_conflict. Set the initial state inside the tween with gsap.fromTo(el, { x: -40 }, { x: 0 }) instead of a CSS transform: translateX(-40px).
Never put crossorigin on <video>/<audio>. lint rejects it unconditionally with media_crossorigin_breaks_preview (error), including for canvas/WebGL/WebAudio readback. There is no suppression.
Never give a <video data-start> an ancestor that also carries data-start. lint rejects it with video_nested_in_timed_element (error). Time the wrapper or the video, not both.
Every <audio> needs an id. lint rejects it with media_missing_id, and an id-less <audio> is never picked up by the mixer, so the render is silent.
Never tween a .clip with autoAlpha or visibility — lint rejects it with gsap_animates_clip_element. Animate a child instead.
A named CSS font-family needs an in-file @font-face to a shipped local file, or lint fires font_family_without_font_face.
Sub-composition #root uses width/height: 100% (or inset: 0), not hardcoded 1920px/1080px. Canvas size is data-width/data-height.

A lint error also switches off the layout and contrast audits: check then reports 0 sample(s) and 0/0 text checks, which reads like a clean file but means nothing ran. Clear lint errors before you trust those numbers.

Non-negotiable rules (silent bugs automated gates may miss)

Surfaced here; full rationale in the linked reference. Do not violate:

No render-time clocks / unseeded Math.random / network / input-state; no repeat: -1 (use a finite count). → determinism-rules.md