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Field signal ts=1784131903 (win32/x64, CLI 0.7.58, 156s UI-heavy): stable ONLY with four flags together — --workers 1 --no-browser-gpu --low-memory-mode + PRODUCER_ENABLE_STREAMING_ENCODE=false. Since --no-browser-gpu and --low-memory-mode already imply screenshot capture, three of the four flags are structurally coupled. Auto-detect the compound at resolveConfig time and disable streaming-encode on the caller's behalf; user explicit-set (PRODUCER_ENABLE_STREAMING_ENCODE or overrides.enableStreamingEncode) always wins. Composition duration is not known at the config layer, so the wire-up passes compositionDurationSec:undefined and the helper reduces to the three-condition compound (platform + softwareGpuForced + workers=1). The 4-arg helper stays exported for downstream callers that DO know duration (e.g., renderOrchestrator) and want the >120s guard. Trade-off documented in code + PR body: false positives possible for short (~<120s) Windows software-GPU single-worker renders. Mitigation is the explicit opt-in escape hatch. Emits a single [hyperframes] log line naming the trigger + how to opt back in, so operators can tell an auto-disable apart from an explicit opt-out. Adds streamingEncodeAutoDisabledOnWin32Compound internal provenance for downstream telemetry. Stack: PR #2 of 9 (base via/protocol-timeout-discoverability). Signed-off-by: Via
@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