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Miguel ÁngelandClaude Sonnet 4.6
ac73cbbcd0
Audio elements inside sub-compositions on the root timeline were ignoring their host composition's data-start placement offset in the WebAudio scheduling path (introduced in #671 / v0.5.4). All sub-comp audio was scheduled with compositionStart equal to its local data-start (typically 0), causing every slide's audio to fire simultaneously at global t=0 instead of at each slide's placement time. Root cause: two sites in the WebAudio path read rawEl.dataset.start directly instead of accounting for the [data-composition-id] ancestor's data-start: 1. player.play() — WebAudioTransport.schedulePlayback() compositionStart arg 2. transportTick — TransportClock.attachAudioSource() compositionStart arg The syncRuntimeMedia path (HTMLMediaElement fallback) was already correct because syncMediaForCurrentState uses resolveMediaCompositionContext which sums the host offset into the clip's start time. Fix: add resolveGlobalAudioStart() that walks up [data-composition-id] ancestors and sums their resolveStartForElement() offsets. Handles nested sub-compositions. Apply it at both broken call sites. Fixes #1174. Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
@hyperframes/core
Types, parsers, generators, compiler, linter, runtime, and frame adapters for the Hyperframes video framework.
Install
npm install @hyperframes/core
Most users don't need to install core directly — the CLI, producer, and studio packages depend on it internally.
What's inside
| Module | Description |
|---|---|
| Types | TimelineElement, CompositionSpec, Asset, canvas dimensions, defaults |
| Parsers | parseHtml — extract timeline elements from HTML; parseGsapScript — parse GSAP animations |
| Generators | generateHyperframesHtml — produce valid Hyperframes HTML from a composition spec |
| Compiler | compileTimingAttrs — resolve data-start / data-duration into absolute times |
| Linter | lintHyperframeHtml — validate Hyperframes HTML (missing attributes, overlapping tracks, etc.) |
| Runtime | IIFE script injected into the browser — manages seek, media playback, and the window.__hf protocol |
| Frame Adapters | Pluggable animation drivers (GSAP, Lottie, CSS, or custom) |
Frame Adapters
A frame adapter tells the engine how to seek your animation to a specific frame:
import { createGSAPFrameAdapter } from "@hyperframes/core";
const adapter = createGSAPFrameAdapter({
getTimeline: () => gsap.timeline(),
compositionId: "my-video",
});
Implement FrameAdapter for custom animation runtimes:
import type { FrameAdapter } from "@hyperframes/core";
const myAdapter: FrameAdapter = {
id: "my-adapter",
getDurationFrames: () => 300,
seekFrame: (frame) => {
/* seek your animation */
},
};
Parsing and generating HTML
import { parseHtml, generateHyperframesHtml } from "@hyperframes/core";
const { elements, metadata } = parseHtml(htmlString);
const html = generateHyperframesHtml(spec);
Linting
import { lintHyperframeHtml } from "@hyperframes/core/lint";
const result = lintHyperframeHtml(htmlString);
// result.findings: { severity, message, elementId }[]
Documentation
Full documentation: hyperframes.heygen.com/packages/core
Related packages
@hyperframes/engine— rendering engine that drives the browser@hyperframes/producer— full render pipeline (capture + encode)hyperframes— CLI