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The npm scope becomes @hanzo: the CLI is @hanzo/frame, every library is @hanzo/frame-<name>. Versions go to 0.7.82. Credentials come from Hanzo IAM. `hanzo login` runs the IAM device flow and writes ~/.hanzo/credentials.json; unattended runs read HANZO_API_KEY delivered from Hanzo KMS. src/api.ts is the one place that knows the base URL and the credential, replacing the OAuth client, PKCE flow, loopback server, token store, and ~/.heygen credential file. `frames auth` keeps only `status`, since this CLI no longer issues credentials. Publish and feedback post to api.hanzo.ai/v1 without the HeyGen routing header. The HeyGen-hosted `frames cloud` render target is gone; local, AWS Lambda, and Google Cloud Run remain. Voice resolves to Hanzo speech (POST /v1/audio/speech) before local Kokoro; music resolves to local MusicGen. No analytics project is configured, so the CLI and studio send no events — they previously reported to HeyGen's. Drops the HeyGen wordmark from the studio header and the HeyGen promo render fixture with its brand assets and fonts.
@hanzo/frame-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 @hanzo/frame-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,
createCaptureSession,
initializeSession,
captureFrame,
closeCaptureSession,
} from "@hanzo/frame-engine";
// 1. Launch browser
const browserLease = await acquireBrowser({ captureMode: "beginFrame" });
// 2. Open a capture session
const session = createCaptureSession({
browser: browserLease.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 browserLease.release();
Most users should use @hanzo/frame-producer or the frames CLI instead of calling the engine directly.
Documentation
Full documentation: frames.hanzo.ai/packages/engine
Related packages
@hanzo/frame-core— types, parsers, frame adapters@hanzo/frame-producer— high-level render pipeline built on this engineframes— CLI