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Lirian Su
f3bb6dc125
`isVisualAncestorHidden` was treating any `visibility: hidden` ancestor as a signal to skip injecting the replacement frame. That's too broad — for plain `[data-start]` containers, the replacement `<img>`'s explicit `visibility: visible` correctly overrides the ancestor per CSS spec, and consumers rely on that to hold the final GSAP-driven frame when an authored `data-duration` outlives the composition's GSAP timeline (e.g. `style-9-prod`, where the runtime truncates the host to `visibility: hidden` after the timeline ends and the replacement frame must paint through). Restrict the `visibility: hidden` skip to ancestors that carry `data-composition-src` or `data-composition-file` — the actual sub-composition hosts this guard was added for. `display: none` keeps the broad behavior: it takes the whole subtree out of layout and a child override cannot escape. Update the existing regression suite to mark the host as a sub-composition, and add two new cases pinning the plain-`[data-start]` behavior: both `injectVideoFramesBatch` and `syncVideoFrameVisibility` must still produce a visible replacement `<img>` when the host is `visibility: hidden` but does not carry a sub-composition attribute.
@hyperframes/engine
Seekable web-page-to-video rendering engine built on Puppeteer and FFmpeg.
Framework-agnostic: works with GSAP, Lottie, Three.js, CSS animations, or any web content that implements the window.__hf seek protocol.
Install
npm install @hyperframes/engine
Requirements: Node.js >= 22, Chrome/Chromium (auto-downloaded by Puppeteer), FFmpeg
What it does
The engine opens your HTML composition in a headless Chrome instance, seeks frame-by-frame using Chrome's HeadlessExperimental.beginFrame API, captures screenshots, and encodes them into video with FFmpeg.
Key services
| Service | Description |
|---|---|
| browserManager | Launches and pools headless Chrome instances (chrome-headless-shell) |
| frameCapture | Manages capture sessions — seek, screenshot, buffer lifecycle |
| screenshotService | BeginFrame-based capture with CDP (Chrome DevTools Protocol) |
| chunkEncoder | FFmpeg encoding with chunked concat, GPU detection, faststart |
| streamingEncoder | Pipe frames to FFmpeg in real time (no intermediate PNGs on disk) |
| audioMixer | Parse <audio> elements and mix audio tracks via FFmpeg |
| videoFrameExtractor | Extract frames from <video> elements for compositing |
| parallelCoordinator | Split frame ranges across worker processes |
| fileServer | Serve local HTML files to the browser via Hono |
Usage
import {
acquireBrowser,
releaseBrowser,
createCaptureSession,
initializeSession,
captureFrame,
closeCaptureSession,
} from "@hyperframes/engine";
// 1. Launch browser
const browser = await acquireBrowser({ captureMode: "beginFrame" });
// 2. Open a capture session
const session = createCaptureSession({
browser: browser.browser,
url: "http://localhost:3000/my-composition.html",
width: 1920,
height: 1080,
fps: 30,
});
await initializeSession(session);
// 3. Capture frames
for (let i = 0; i < totalFrames; i++) {
await captureFrame(session, i, `/tmp/frames/frame-${i}.png`);
}
// 4. Clean up
await closeCaptureSession(session);
await releaseBrowser(browser);
Most users should use @hyperframes/producer or the hyperframes CLI instead of calling the engine directly.
Documentation
Full documentation: hyperframes.heygen.com/packages/engine
Related packages
@hyperframes/core— types, parsers, frame adapters@hyperframes/producer— high-level render pipeline built on this enginehyperframes— CLI