mirror of
https://github.com/heygen-com/hyperframes.git
synced 2026-10-30 09:16:55 +00:00
James RussoandClaude Opus 5.5
6afcb48395
* fix(engine): sample VFR video by timestamp so it does not freeze on FFmpeg 8 VFR sources were resampled with `-fps_mode cfr -r`, which on FFmpeg 8 honours each frame's duration. In mp4 files with B-frames those durations are decode-order gaps, so a frame can claim 0.4s while the next one starts 17ms later, and the extracted video froze on it. VFR now uses the same fps filter sampling as CFR (the frame on screen at each output tick), bounded by -frames:v so a window that ends on a still keeps its rounded-up frame count. The two-process raw pipe that worked around FFmpeg 5.1 dropping durations under -vf is no longer needed and is removed. The vfr-screen-recording golden is regenerated: FFmpeg 5.1's cfr mapping it was rendered with ran one to two source frames late. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> * fix(engine): move the extraction cache to v7 so v6 VFR frames are not reused v6 entries for VFR sources hold frames sampled by packet duration, which FFmpeg 8 freezes and FFmpeg 5.1 lags. The key is unchanged by the fix, so a warm cache served them after the upgrade. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.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,
createCaptureSession,
initializeSession,
captureFrame,
closeCaptureSession,
} from "@hyperframes/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 @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