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https://github.com/heygen-com/hyperframes.git
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Miguel Ángel
8ac7ae9088
Chrome's compositor determinism flags (--run-all-compositor-stages-before-draw, --disable-threaded-animation, --enable-surface-synchronization, etc.) were previously only applied for BeginFrame mode on Linux. In screenshot mode — used on macOS/Windows — the compositor ran without these constraints, allowing Metal on Apple Silicon to accumulate state drift over sustained frame captures. This produced vertical layout shifts after ~12 seconds of rendering, reported on M1 machines. The shifts occurred because the compositor's threaded animation and surface synchronization pipelines could race with Page.captureScreenshot, and without --run-all-compositor-stages-before-draw, pending compositor stages weren't flushed before each screenshot. Split the flags into two groups: - BEGINFRAME_EXCLUSIVE_FLAGS: --enable-begin-frame-control and --deterministic-mode, which pause the compositor or freeze the clock and must NOT be used in screenshot mode - COMPOSITOR_DETERMINISM_FLAGS: the remaining 7 flags that enforce deterministic compositor behavior and are safe for all capture modes The compositor flags are now applied unconditionally in buildChromeArgs. Closes #828
@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