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Vance IngallsandClaude Sonnet 5
99f42be04c
* feat(core): route grouped audio through a group bus in preview An audio element carrying `data-audio-group` no longer lands its gain on the master bus directly — it feeds a per-group `GainNode` (built lazily on first use, one per group id) which itself feeds master, so members of the same group sum before the ear, ready for a group-level FX chain and volume/mute in later steps. An id with no matching `<hf-audio-group>` element still gets a plain, unprocessed bus rather than losing the track. The group's own chain and volume lane are wired through the same `attachElementFxChain`/`scheduleVolumeLane` every element already uses, against the group's clock — composition time (design doc §1.3), since a group has no `data-start` and a missing one parses as 0. The bus persists across `stopAll()` (mirroring `_masterGain`'s own lifecycle) so replaying a group does not rebuild its chain; only `destroy()` disposes it. Render is untouched — stays flat until B4; `audio-groups` is still a 0% canary so nothing ships this to a real composition without hand-authoring `data-audio-group`. Also: `audioGroupOf` (B1) crashed on any element lacking a real `tagName`/ `getAttribute` — exactly the shape of most `HTMLMediaElement` test doubles in this suite, including this file's own `mockEl`. Made it tolerant, same style as `readChain`'s existing guard in `runtime/audioFx.ts`. `schedulePlayback` was already 110 lines pre-existing before this diff; extracted `resolveDestination` and `handleSourceEnded` to shrink it to 92, then suppressed the remainder (inherently sequential graph wiring, not a decision tree) per the same precedent B2 used on `TimelineLogicalRow`. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> * feat(studio,lint): carve targets voiceover groups — always, when plural Plural voiceover carve now targets a group instead of naming each clip: `resolveCarveSourceIds` (core `audioGroups.ts`) expands a group id to its current members at analysis time, so a clip added to the group later is covered without touching `sources`. The picker (`useFxCarve.ts`) offers a grouped voice as one option instead of one row per member, tests overlap as a union of member spans (a group overlaps the bed if ANY member does), and prefers a qualifying group over its individual members in `autoSourceIds`. Picking two or more ungrouped voice clips in the carve flow now mints a group behind them (`mintGroupId`, de-duped against every id in the document) and writes `data-audio-group` on each picked clip atomically, one undo entry — `createAudioGroupAndAssignMembers` in `timelineTrackVisibility.ts` copies `setElementsHidden`'s multi-target write shape. The DSP is untouched: `mixCarveSources` already sums multiple sources correctly (verified in the design doc's own investigation) — this only fixes the picker. New lint rule `audio_carve_ungrouped_sources` (`packages/lint/src/rules/ media.ts`, alongside `audio_volume_double_automation`) warns when a `data-fx-carve`'s `sources` names two or more plain clip ids instead of a group — the shape that silently rots when a clip is added. `/hyperframes- audio` states the same rule as an invariant, not a tip, with the grouped- narration HTML example from the design doc. The group-matching and auto-group logic (`withAutoGroupedSources`, `collectCarveCandidates`) is split into `useFxCarveGrouping.ts` — `useFxCarve.ts` was pushing past the 600-line cap. `resolveNextCarveSettings` is deliberately NOT an `async function`: wrapping it in one would force a microtask on every call, including the synchronous branch — the exact bug `withAutoGroupedSources`'s own sync-when-possible contract exists to avoid, and one caught via `propertyPanelAudioFxGroup.test.tsx` (10 failures) before fixing it back to a plain function the caller conditionally awaits. Also extracted `useEffectiveTimelineDuration` out of `App.tsx` and `useRemoveBackground` out of `StudioRightPanel.tsx` (both pushed past 600 lines from an added prop wire), and decomposed `useFxCarve.ts`'s picker IIFE to clear fallow's complexity gate. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> * feat(engine): render grouped audio through a summed, FX-processed bus Renders what B3 already routes in preview: a group's members sub-mix into one PCM WAV at full composition length (adelay already places each member at its composition position, so the group WAV's t=0 IS composition time), run through the group's own FX chain and automation via the same applyAudioFxChain/envelope-bake path a member uses, then fold into the flat track list as one processed AudioTrack — the final mixAudioTracks call never has to know groups exist. Gain law verified against plans/spikes/amix-nesting-spike.sh (brought over from the plans branch, along with audioMixer.grouping.test.ts, since both were committed there and never merged to origin/main — every step branch in this stack descends from origin/main): the sub-mix's own amix prefers normalize=0 (nulls exactly against a flat mix), falling back to per-node compensation by the group's OWN member count only when this ffmpeg build's amix rejects the option. Carrying any other count into a nested amix node is the exact +2.499 dB silent failure the spike measured — confirmed by a manual mutation check (wrong-count compensation landed 3.5 dB hot, exactly 20*log10(3/2) for a 2-member group compensated as 3; reverted after confirming the level test catches it). A group element carrying data-hidden drops every member before the sub-mix ever runs (RULES: mute-by-drop, never mute-by-volume-0) — parseAudioElements now resolves groups once per parse and skips hidden-group members the same way it already skips data-hidden ancestors. HfAudioGroup (packages/core/src/audioGroups.ts, from B1) gains fxChain, automation, volume and hidden, read off the group element the same way resolveAudioGroups already reads data-label — audioGroups.test.ts updated for the wider shape plus new coverage for the added reads. it.todo("mixes a grouped composition at the same level as the ungrouped one") is now a real, passing test; two more added per the step doc (FX routing isolation, member-level envelope survives grouping). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 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,
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