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* fix: hide console windows spawned by ffmpeg and nvidia-smi on Windows Node's `windowsHide` defaults to false, so every child process that is a console application pops a window on the user's desktop. During a render or a regression run that is a stream of black windows stealing focus. The repo already sets `windowsHide: true` across cli, studio-server and most of engine; these were the remaining gaps, all on paths that run during a normal render: - core/mediaGradeAnalyzer: ffprobe + ffmpeg, once per analyzed media file - engine/browserManager: `nvidia-smi` VRAM probe. This one goes through a shell (`execSync`), so it flashes a cmd.exe window even on machines with no NVIDIA GPU, where the command exists only to fail - producer: the regression harness ffmpeg runner, PSNR/audio comparison helpers, fixture synthesis, and the ffprobe call in audioPadTrim No behavior change on POSIX, where the flag is ignored. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(producer): escape PSNR stats_file for ffmpeg's two-pass filtergraph parse An ffmpeg filtergraph argument is unescaped twice: once when the graph is split into filters and their options, then again when the option value is read. `psnrAtFrames` escaped `\` and `:` a single time, which only survives the first pass. On POSIX that is invisible, because mkdtemp under tmpdir() produces neither character. On Windows the stats path is always `C:\Users\...`, so it reaches the option parser with a bare `:`, which starts a new option and fails the whole graph: [AVFilterGraph] No option name near '\Users\...\psnr.log' Error parsing filterchain '[rv][gv]psnr=...:stats_file=C\:\Users\...' Every suite that got as far as quality validation died there, so a Windows regression run reported 0 passes with only 2 genuine compilation failures. Escaping for both passes fixes it and stays a no-op on POSIX. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * test(producer): pin PSNR stats path escaping with a colon and backslash path * fix(producer): keep the PSNR stats path out of the filtergraph --------- Co-authored-by: Claude Opus 5 <noreply@anthropic.com> Co-authored-by: Miguel Ángel <miguel.sierra@heygen.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