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synced 2026-09-03 04:38:33 +00:00
Miguel Ángel
4a36655b2b
* fix(engine): resolve relative data-start references in video-frame extraction <video data-start="intro"> (a relative reference to another clip's end) is resolved by the browser runtime but parseVideoElements/parseImageElements did a raw parseFloat, yielding NaN start/end. The FrameLookupTable active-window checks (start <= t <= end) are then always false, so the clip is never injected and composites BLANK in the final render — while lint/validate/inspect/snapshot and the live preview all look fine. The docs' Relative Timing section teaches exactly this pattern on <video>. Share the pure reference-syntax parser (parseStartExpression) out of the runtime resolver into @hyperframes/core, and resolve references in the extractor against the linkedom document it already holds: a reference resolves to the target clip's resolved start + its duration (data-duration or data-end) + offset, mirroring the runtime. Cycle-guarded; an unknown target or unknown duration falls back to the target's start / 0 (never NaN), matching runtime semantics. Natural-media-duration-only targets aren't known at parse time (same limit as the runtime's fallback). parseImageElements gets the same fix. Runtime resolver behavior is unchanged (its 25-case suite still passes). * chore: re-trigger CI to refresh a stuck CodeQL aggregate check
@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