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Vance Ingalls
0126db7712
Twelve of the stack's feature commits landed on main as squashes (#3274 through #3292, plus #3401's canary removal); the 96 review-and-fix commits that followed them here did not, and main moved 64 commits on in the meantime. This reconciles the two. 58 files conflicted. 44 were audio-only — main's side there is the squashed form of commits this branch already carries and has since superseded, so the branch side stands. The rest needed real work, in both directions: **Taken from main, absent here.** - `ensureAudioGroupInertStyle` (#3278's review). An `<hf-audio-group>` is an unknown custom element, so it still takes a flex/grid slot and can open a line box — adding a group shifted authored layout. The helper and its `init.ts` call never came back to the branch, and this branch is what emits the element. - `#3383`'s ended-audio replay: `canSeekEndedMediaBackward` and its five siblings in `media.ts`, with all six tests. Not present here in any form. - `#3380`'s `asetpts=N/SR/TB` between `apad` and `atrim`. Also applied to `mixGroupMembers`, the group submix, which is new on this branch and so had the same bug in a path main's fix could not reach: delayed members padded then amix'd, where a group of four or more silently loses one. - `#3401`'s `displayNumber` thread. The header derives its row from the group-aware order and the undo label from ascending element keys, so once a group exists the same click said "Hide track 2" and recorded "Hide track 1". - `#3413`/`#3421`'s viewport handling — the popover's height cap and `inset()`, and `resolveFloatingPanelPosition` for the grouping dialog, which lives in a track header at the bottom of the window. - Two extractions this branch had inline and at exactly the 600-line cap: `useTimelineDeleteOps` and `editingModeSlice`. Bodies were identical. **Kept from the branch, against main.** Mute and solo are gone by deliberate breaking change (`remove mute and solo from tracks and groups`, `remove the group volume slider and level meter`), so eight files main still carries are deleted again, `PlayerControls` keeps no `previewIframeRef` (it existed only to feed `SoloBanner`), the group-levels branch comes out of main's new `previewMessageRouter`, and `STRIP_H` goes with the bus strip it sized. Main's `TimelineTrackPlainHeader.test.tsx` is rewritten against the control that actually exists — the visibility eye, withheld from an audible audio row and offered back once hidden, which is the only way out of `data-hidden`. **Unioned.** `TimelineFxPopover` — main's positioning, this branch's audition telemetry (`auditionPresetChain`, `storedChain`, `onAuditionTracked`); `SKILL.md` — main's #3416 "keep the carve group a voice group" beside this branch's bus section, with the canary paragraph dropped since the canaries no longer exist. Every port is mutation-checked. core 2508, studio 4460, lint 528, engine 1630, cli 2813, sdk 549, producer green; tsc, oxlint, oxfmt, fallow and the 600-line cap clean.
@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