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James Russo
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* fix(core): drive adapter seeks when composition has no GSAP timeline renderSeek returned early when deps.getTimeline() was null, skipping the onDeterministicSeek call that drives all frame adapters (CSS, WAAPI, Lottie, Three.js). That meant compositions using any non-GSAP animation primitive froze on their initial frame during capture. Now we still quantize the seek time and fire onDeterministicSeek even without a timeline, so each adapter gets a chance to advance. GSAP compositions are unaffected — timeline-driven seek still takes the same path it did before. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(producer): auto-fallback screenshot capture for raf and iframes Co-Authored-By: Codex <codex@openai.com> * test(producer): add render compatibility regression fixtures Co-Authored-By: Codex <codex@openai.com> * fix(core): scrub CSS animations via WAAPI currentTime Co-Authored-By: Codex <codex@openai.com> * test(producer): cover css keyframe renders Co-Authored-By: Codex <codex@openai.com> * fix(producer): propagate virtual time into iframe documents Co-Authored-By: Codex <codex@openai.com> * test(producer): refresh iframe docker golden Co-Authored-By: Codex <codex@openai.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> Co-authored-by: Codex <codex@openai.com>
@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