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Vance IngallsandClaude Fable 5
1005703441
Default-on drawElement ships with a runtime self-verification net (#1998); this makes its in-the-wild behavior observable. Every render_complete event now answers: which capture mode actually ran, why drawElement disengaged when it did (compile gate / producer clamp / engine init gate), whether the self-verify net fired and why, and how much margin verification had. Follows the static-dedup telemetry pattern: engine session fields → CapturePerfSummary → RenderPerfSummary.drawElement → snake_case props on render_complete. New event props: de_capture_mode, de_compile_gate, de_clamp_reason, de_gate_reason, de_worker_encode, de_verify_armed, de_verify_checked, de_verify_min_db (margin above the 32dB threshold — drift here is the early-warning signal before fallbacks spike), de_verify_init_ms, de_self_verify_fallback, de_fallback_reason, de_blank_suspects, de_blank_deterministic_accepts, de_blank_recaptures, de_boundary_frames, de_ncpr_fallbacks. Validated end-to-end on live renders: drawelement path reports mode/verify counters/minDb/init cost; a blur-gated comp reports mode=screenshot + gate_reason=css_effect:filter; a forced verification failure reports self_verify_fallback=true + fallback_reason=psnr. Co-authored-by: Claude Fable 5 <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,
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