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James RussoandClaude Opus 4.8
d580f2a1d8
* fix(render): make WebGL video textures deterministic in headless render WebGL compositions that sample a `<video>` as a texture (e.g. a faceted crystal with clips mapped onto its facets) rendered with flickering, non-deterministic facets: a video would intermittently show a stale frame or go black, and the same frame differed between two renders. Two gaps caused this: 1. No WebGL analog of the WebGPU `patchVideoTextureCompat`. Chrome's headless compositor can't feed decoded `<video>` frames to the GPU, so the engine injects a decoded `<img class="__render_frame__">` sibling per video each frame. The WebGPU `copyExternalImageToTexture` path substitutes it, but `texImage2D` / `texSubImage2D` did not — so WebGL uploaded a stale/black frame. Add `patchWebGLVideoTextureCompat()` mirroring the WebGPU patch (shared `resolveRenderFrameImage` helper). 2. Capture ordering. Per frame the runtime seeks (GPU adapters render on `hf-seek`) BEFORE the engine injects the decoded frames, so the GPU render read a frame that didn't exist yet. After injecting, the engine now calls `window.__hfReseekGpu(t)` — a force-dispatch (`forceDispatchSeekEvent`) that bypasses the same-time `hf-seek` dedup — so GPU compositions re-upload their textures from the freshly-injected, decoded frames, deterministically. Tests: unit tests for the texImage2D/texSubImage2D substitution and the force-dispatch, plus a videoFrameInjector regression test asserting the post-injection GPU reseek fires only when frames were injected. Verified end-to-end: a WebGL prism with 8 live <video> facets renders byte-identical across independent runs with no facet flicker. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * test(render): add producer render-compat regression for WebGL video textures A WebGL2 canvas samples a <video> as a texture every hf-seek (the natural author pattern, distilled from the HeyGen prism). The render-compat harness renders it and compares against the golden: with the video-texture fix the render reproduces the decoded frames; revert the fix and the canvas renders black, collapsing the comparison. Golden verified to contain real, time-varying video content (not black), so a regression is caught rather than passing vacuously. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@hyperframes/core
Types, parsers, generators, compiler, linter, runtime, and frame adapters for the Hyperframes video framework.
Install
npm install @hyperframes/core
Most users don't need to install core directly — the CLI, producer, and studio packages depend on it internally.
What's inside
| Module | Description |
|---|---|
| Types | TimelineElement, CompositionSpec, Asset, canvas dimensions, defaults |
| Parsers | parseHtml — extract timeline elements from HTML; parseGsapScript — parse GSAP animations |
| Generators | generateHyperframesHtml — produce valid Hyperframes HTML from a composition spec |
| Compiler | compileTimingAttrs — resolve data-start / data-duration into absolute times |
| Linter | lintHyperframeHtml — validate Hyperframes HTML (missing attributes, overlapping tracks, etc.) |
| Runtime | IIFE script injected into the browser — manages seek, media playback, and the window.__hf protocol |
| Frame Adapters | Pluggable animation drivers (GSAP, Lottie, CSS, or custom) |
Frame Adapters
A frame adapter tells the engine how to seek your animation to a specific frame:
import { createGSAPFrameAdapter } from "@hyperframes/core";
const adapter = createGSAPFrameAdapter({
getTimeline: () => gsap.timeline(),
compositionId: "my-video",
});
Implement FrameAdapter for custom animation runtimes:
import type { FrameAdapter } from "@hyperframes/core";
const myAdapter: FrameAdapter = {
id: "my-adapter",
getDurationFrames: () => 300,
seekFrame: (frame) => {
/* seek your animation */
},
};
Parsing and generating HTML
import { parseHtml, generateHyperframesHtml } from "@hyperframes/core";
const { elements, metadata } = parseHtml(htmlString);
const html = generateHyperframesHtml(spec);
Linting
import { lintHyperframeHtml } from "@hyperframes/core/lint";
const result = lintHyperframeHtml(htmlString);
// result.findings: { severity, message, elementId }[]
Documentation
Full documentation: hyperframes.heygen.com/packages/core
Related packages
@hyperframes/engine— rendering engine that drives the browser@hyperframes/producer— full render pipeline (capture + encode)hyperframes— CLI