Miguel Ángel
95e3930faf
* fix(core): audio clips join on time and their volume lane follows the audio An incoming <audio> clip is now pre-seeked to its in-point like a video, and a playing audio element that drifts is steered by rate instead of seeked while it sounds. A routed clip's volume lane and fades are re-aimed at the element's own position whenever it starts, is seeked or changes rate. * fix(core): sounding audio is nudged at most 10%, and a larger lag seeks under a short dip Speech audibly changes tempo past a 10% rate nudge, and a bare seek clicks. Audio that holds a lag rate cannot close in about a second is seeked under a 15 ms dip on its routed graph; an unrouted element is seeked plainly. Video keeps its steps. * fix(core): a routed clip's automation has one owner, its element, looping included A rate change re-aimed a routed clip's lane on the context clock and again when the element took the new rate. Only the element re-aims it now. A looping element's wrapped position is placed on the pass the transport is in, so a looping bed's lane follows it too. * style(core): wrap a steering comment to the line limit * refactor(core): one drift policy for playing media, exported for the parent proxy The steering steps, the audio cap and limit, and the steering state move to runtime/mediaSteer.ts as steerMedia(el, offset, baseRate, settled) and forgetSteering(el), exported as @hyperframes/core/runtime/media-steer so the player's parent-frame proxy uses the same policy instead of a second one. * style(core): trim the drift policy's comments to the package's share * fix(core): the dipped seek lands on the frame-start media time Routes the one currentTime write this branch adds through mediaElementTime, so Chrome's truncated currentTime cannot land it a frame early. * test(core): expect the plain audio seek at the frame-start media time
@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) |
Generated composition trust
Composition generators require trusted authors for code-bearing inputs. styles and
generateHyperframesStyles preserve authored CSS, which can load external resources.
animations may contain __raw: values that are emitted as JavaScript;
includeScripts: true includes executable timeline code. serializeGsapAnimations
also accepts raw preamble, postamble, and a code-bearing timelineVar. Never fill
these inputs with untrusted data. Attribute encoding and closing-tag containment
are not a sandbox; render untrusted compositions in an appropriately isolated
execution environment and never serve them on a privileged origin.
Text content retains the supported inline-formatting sanitizer contract. The clip parser intentionally flattens inner formatting to text, so parse/generate is not a lossless replacement for editing the source HTML.
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