@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 engine
• hyperframes — CLI