Miguel Ángel
ec0b23f3ce
* fix(studio): delete every clip in the selection, not just the first Select all in the timeline, press Delete, and one clip disappeared while the rest stayed — still drawn as selected. The Delete hotkey built the selection set correctly and then called `elements.find(...)`, which stops at the first match, and handed that single element to a handler that deletes exactly one. The comment above it claimed the handler "expands a clip that is part of the multi-selection into an atomic delete of the whole selection (single undo)" — no such expansion existed anywhere; `useTimelineEditing` never read `selectedElementIds`. `handleTimelineElementsDelete` takes the whole selection and removes every element before saving once, so the delete is a single history entry and a single undo — what the comment already promised. The hotkey layer now takes only that plural handler, since it never deletes one element in isolation; the singular entry point stays for the context menu and clip chrome. The store drops every deleted key and clears the marquee set, rather than leaving a selection drawn around clips that no longer exist. Elements whose `sourceFile` is not the composition being edited are dropped from the pass rather than written to the wrong file. Also removes the preview's double-click-to-reset-zoom. It was a document-level capture listener, so any double-click anywhere over the viewport snapped the zoom back to fit — including double-clicks meant for the content under it. The explicit reset control beside the zoom HUD stays. Reproduced by test: restoring `elements.find` reds the new marquee case. * fix(studio): delete every canvas element in the selection, not just the primary Selecting several elements on the canvas and pressing Delete removed one of them and left the rest — still drawn as selected. The delete path only ever took the primary selection; the marquee group it belongs to was ignored. Expand the session-level delete through the group ref, the same way the other group commits already do, and let the lifecycle op remove every member under a single save so one Undo restores the whole selection. * fix(studio): let the canvas selection own Delete instead of its timeline mirror Marquee-selecting elements on the canvas and pressing Delete removed a fraction of them. The hotkey routed to the timeline delete whenever the timeline store held anything, and the timeline's copy of a canvas selection is derived and lossy by construction — a member with no timeline row of its own is dropped from it. Selecting 73 elements published 14 ids, so 14 went and 59 stayed, still drawn as selected. The canvas selection is what the user drew the marquee around, so it owns Delete whenever it holds something; the timeline path stays as the fallback for rows with no canvas node to select. Both paths already remove through the same endpoint, so this is one addressing scheme replacing two. That makes the canvas delete the path a Delete press normally takes, so it picks up the same mid-recording refusal the timeline delete has. * fix(studio): let the marquee see the whole document, not the first 80 elements Dragging a marquee over the entire canvas selected a fraction of what it covered, so Delete left most of the page behind. The hit test sourced its candidates from the layers-panel collector, which stops after 80 items — a budget for how many rows that panel is willing to render, silently reused as if it described the document. Everything past the 80th element in document order was unselectable no matter where the user dragged. The off-canvas indicators were reading the same truncated list. The cap now belongs to the panel that wants it; the collector returns everything. To pay for that, the marquee measures its candidates once when the drag passes the threshold instead of re-reading layout for every element on every pointer-move: unbounded plus per-move stalled the tab outright, and the iframe DOM does not mutate mid-drag, so one pass stays true for the gesture. On a captured page: one marquee, one Delete, 734 elements down to 81. * fix(studio): report a no-op delete instead of claiming the elements went A target the file no longer holds answers `changed: false`, which is normal for a member nested inside another member already removed. Every target answering that is not — it means the preview is describing a document the file does not have, so each removal misses and the file is written back untouched. The toast still said "Deleted 503 elements. Use Undo to restore them." That is how a delete that did nothing at all looked from the outside: press Delete, the page stays, nothing on screen explains it. Say the preview is out of date and reload it instead. * fix(studio): keep the canvas hotkeys alive across preview reloads Pressing Delete with a canvas selection did nothing at all — no removal, no toast, nothing on screen to explain it. A keypress goes to whichever document has focus, and clicking the canvas puts focus inside the preview iframe, so the app's hotkeys have to be forwarded there. They were, but only from the iframe element's ref callback, which fires when the element mounts. A preview reload keeps the same element, so the callback never runs again, and keeps the same WindowProxy, so the forwarder's identity check saw no change and skipped re-attaching — while the inner window holding the listeners had been replaced. After the first reload the canvas had no app hotkeys left. Undo and redo kept working because their forwarder re-attaches on every load, which is why this read as "only Delete is broken". Fold the app handler into that per-load forwarder so both attach in the same place, on every load, and drop the mount-only one. Window only: the history pair also listens on the document, and capture listeners on both would run the app handler twice per press. * perf(studio): stop re-probing every restored selection member on load The hash carries the whole canvas selection, and restoring it asked the server whether each member still exists in the source — one request per member, awaited one after another. A marquee over a captured page puts hundreds of members in the URL, so every later load of that URL spent hundreds of serial round trips rebuilding the selection before the canvas answered anything, keypresses included. The marquee that produced those members already skips the probe. Restoring them skips it too; only the primary, whose panel reads the flag, still pays for one. * fix(studio): delete a canvas selection in one pass and say the key landed Reproduced with a real, focus-routed keypress instead of a synthetic one: the press does reach the handler and the delete does run to completion, but at hundreds of members it takes seconds during which the canvas is unchanged and nothing acknowledges the key. Silence for that long is indistinguishable from Delete being broken, and pressing it again or reloading mid-flight lands in a worse state. Two things, one per cause. The removal now sends the whole selection in a single request against a new remove-elements route, which reads the file once, drops every member and writes once — it was a round trip AND a full rewrite of the file per element. And a multi-element delete announces itself before the work starts, so the press is visibly acknowledged instead of leaving the canvas looking untouched until it finishes. Measured on a captured page, 84 members: 933ms of serial round trips against 84 rewrites, down to 583ms and one. * refactor(studio): narrow the SDK delete targets instead of asserting them The batch SDK path guarded on every member having an hfId and then asserted it away per member. Narrow once into a string list so the guard and the values come from the same place, and drop a threaded content variable that never changed — the SDK owns the document it edits, so every member is removed against the same starting content. Also mounts the new forwarding test through the existing harness rather than repeating its setup. * fix(studio): stop Delete acting on a canvas selection the user replaced Two things the reordered Delete arbitration got wrong, both found in review. A clip with no canvas node left the canvas selection pointing at whatever was picked before it, and the canvas branch wins whenever that ref is non-null — so selecting an audio clip and pressing Delete removed the previously selected canvas element and left the clip, right after the toast said the clip was not in the preview. The timeline fallback the comment described could not be reached. Clearing that selection has to stay quiet: the clear is announced to the timeline, so echoing it would deselect the clip that was just picked. Expanding the primary to the marquee group also moved out of the delete handler and up to the Delete key. Cut copies the primary alone, so expanding for every caller put one element on the clipboard and removed every other member with it — undo brought them back, paste restored one. The rule is a named function now, so the two callers can differ without either guessing. Also throttles the off-canvas indicator rebuild, which the cap had been hiding. It walks every element in the preview and reads layout for each — measured at 6.5ms on an 825-element captured page against a 16.7ms frame — and what marks it dirty is a MutationObserver on inline style, which is how animation writes. * fix(studio): hold the canvas selection inside the timeline selection The stale-canvas-selection defect survived at the second writer. The store-driven sync bails when a member has not resolved yet and returned without touching the canvas, so a pick with no canvas node at all left the previous selection in place — and Delete acts on the canvas first, so it deleted that. Reachable from the sidebar audio and asset reveals and from an asset drop, none of which go through the handler already fixed. Clearing on every bail would be wrong: the bail exists for a member whose node is not ready, which a later run resolves, and clearing there would flicker. Only a canvas anchor that resolves OUTSIDE the current selection goes, which is the state that is dangerous rather than merely unfinished. Quietly, for the same reason as the first writer: announcing would deselect the clip just picked. The invariant is named now, since Delete depends on it: the canvas selection never points outside the current timeline selection. Also drops the x-hf-removed header, which nothing read and whose comment promised a partial-vs-no-op distinction the response cannot make, and pins the indicator throttle that was measured but uncovered.
Write HTML. Render video. Built for agents.
Quickstart | Showcase | Playground | Catalog | Docs | Discord
HyperFrames is an open-source framework for turning HTML, CSS, media, and seekable animations into deterministic MP4 videos. Use it locally with the CLI, from AI coding agents with skills, or as the rendering core behind hosted authoring workflows.
Quick Start
With an AI coding agent
Install the HyperFrames skills, then describe the video you want:
npx skills add heygen-com/hyperframes --full-depth
The picker opens with nothing pre-selected — the Core Skills group is all you need: the
/hyperframesrouter installs each creation workflow on demand. Agents and non-interactive runs should usenpx hyperframes skills updateinstead — it installs exactly the core set, whereas a non-interactiveskills addwithout--skillinstalls all 20.
--full-depthdoes a full clone of the repo's currentmain. Without it,skills addfetches the skills.sh registry blob, which lagsmainby hours — you'd get an older copy of a skill. (hyperframes skills updatealready installs full-depth.)
Try a prompt like:
Using
/hyperframes, create a 10-second product intro with a fade-in title, a background video, and subtle background music.
The skills teach agents the HyperFrames production loop: plan the video, write valid HTML, wire seekable animations, add media, lint, preview, and render. They work with Claude Code, Cursor, Gemini CLI, Codex, and other coding agents that support skills.
Skills
HyperFrames ships 20 skills agents load on demand. Read /hyperframes first — it's the router and capability map; it picks a workflow for any "make me a…" request — video, deck, or composition port — and points to the domain skills below.
Default to the core set — the router installs each creation workflow on demand. npx hyperframes skills update installs exactly that from anywhere; the interactive picker (npx skills add heygen-com/hyperframes --full-depth) lists it as the "Core Skills" group, nothing pre-selected. The picker is interactive-only — a non-interactive or agent run without --skill installs all 20. Use npx skills add heygen-com/hyperframes --all --full-depth to install all 20 deliberately (skips the picker), or npx skills add heygen-com/hyperframes --skill <name> --full-depth for just one (bare name, no leading /). Keep --full-depth — it installs the current main; without it skills add fetches the skills.sh blob, which lags by hours.
Installs stay lean after that: npx hyperframes init keeps the core set fresh (the router, the hyperframes-* domain skills, and media-use — plus whatever is already installed; /figma stays on demand) and never expands a partial install; the creation workflows install on demand — the router runs npx hyperframes skills update <workflow> before entering one. Nothing re-pulls the full set behind your back.
Upload to Codex
Build the upload-ready Codex plugin archive from the committed HEAD version of the manifest, brand assets, and skills:
bun run package:codex-plugin
This writes dist/hyperframes-plugin.zip with a hyperframes/ root folder and fails if the archive exceeds Codex's 100 MB upload limit.
Router
| Skill | Use when |
|---|---|
/hyperframes |
Read first for any request to make / create / edit / animate / render a video, animation, or motion graphic. Capability map for the domain skills, the intent layer that confirms every creation brief up front, and intent router for the creation workflows below. |
Creation workflows
| Skill | Use when |
|---|---|
/product-launch-video |
Any website — marketing / launching / promoting a product (from its URL, a brief, or a script), or a site tour / showcase / social clip featuring the site's own visuals. Up to ~3 min (sweet spot 30-90s). |
/faceless-explainer |
Explaining a topic / concept from arbitrary text — no product, no URL, no website capture; every visual is LLM-invented (typography / abstract / diagram / data-viz). |
/pr-to-video |
A GitHub pull request (PR URL, owner/repo#N ref, or "this PR") → changelog / feature-reveal / fix / refactor explainer, read via the gh CLI. |
/embedded-captions |
Adding captions / subtitles to an existing talking-head video (footage untouched) — verbatim rail, embedded climax behind the subject, or pure-cinematic embed. |
/talking-head-recut |
Packaging an existing talking-head / interview / podcast video with designed graphic overlays — lower-thirds, data callouts, kinetic titles, pull-quotes, side panels, PiP. |
/motion-graphics |
A short, unnarrated, design-led motion graphic (~under 10s) — kinetic type, stat / chart hit, logo sting, lower-third, animated tweet / headline. MP4 or transparent overlay. |
/music-to-video |
A music track (audio file, video to pull audio from, or one generated from a mood brief) → a beat-synced video — lyric, slideshow, or kinetic promo; music drives pacing. |
/slideshow |
A presentation / pitch deck / interactive deck — discrete slides, fragment reveals, branching, hotspot navigation, presenter mode. Output is a navigable deck, not a rendered video. |
/general-video |
Anything else — longer or multi-scene pieces, brand / sizzle reel, title card, static loop, freeform composition. Input- and length-agnostic fallback, and the home of companion mode (co-create with the full toolbox). |
/remotion-to-hyperframes |
Porting an existing Remotion (React) composition's source to HyperFrames HTML. One-way migration, not creation. |
Domain skills (loaded on demand)
Atomic capabilities the creation workflows compose against — pull one when you need that specific layer.
| Skill | Covers |
|---|---|
/hyperframes-core |
The composition contract — data-* timing attributes, class="clip", tracks, sub-compositions, variables, framework-owned media playback, determinism rules. |
/hyperframes-animation |
All animation knowledge — atomic motion rules, scene blueprints, transitions, runtime adapters (GSAP / Lottie / Three.js / Anime.js / CSS / WAAPI / TypeGPU). |
/hyperframes-keyframes |
Seek-safe keyframe authoring across runtimes — GSAP timelines, CSS keyframes, Anime.js, WAAPI, FLIP, paths, masks, SVG morph/draw, 3D depth — plus hyperframes keyframes diagnostics for rendered motion. |
/hyperframes-creative |
Non-animation creative direction — frame.md / design.md, palettes, typography, narration, beat planning, audio-reactive visuals, composition patterns. |
/media-use |
The media OS — resolve any media need (BGM, SFX, image, icon, logo, voice, color grade, LUT) into a frozen local file or paste-ready block + ledger record, generate via TTS/music/image models when the catalog misses, transcribe, caption, remove backgrounds, and reuse assets across projects. One shared audio engine + manifest tracking. |
/hyperframes-cli |
CLI dev loop — init, lint, check, snapshot, preview, render, publish, doctor, plus HeyGen-hosted cloud rendering (cloud render) and AWS Lambda rendering (lambda deploy / render / progress). |
/hyperframes-audio |
Mix the audio already placed in a composition — voiceover carve (dip a music bed only in the bands the voice occupies, static or dynamic, level match included), the effect chain (EQ, compressor, limiter, gate, saturation, delay, reverb, chorus, phaser, bitcrush), and automation envelopes on volume or any effect parameter. Sourcing the audio is /media-use. |
/hyperframes-registry |
Install and wire registry blocks and components into compositions via hyperframes add. Authoring a new block or component to contribute upstream. |
/figma |
Import Figma assets, tokens, components, and storyboard sections → reconstructed motion (frames read as states, not slides) (REST/CLI) plus Motion animations (MCP) and shaders (MCP source / native export) into a composition. |
For visual design handoff workflows, see the Claude Design guide and Open Design guide.
Manually with the CLI
npx hyperframes init my-video
cd my-video
npx hyperframes preview # preview in browser with live reload
npx hyperframes render # render to MP4
Requirements: Node.js 22+, FFmpeg
What You Can Build
Need ideas? Browse the Showcase for finished videos you can watch, read, run, and remix.
- Product launch videos and feature announcements
- PR walkthroughs with animated code diffs, narration, and captions
- Data visualizations, chart races, and map animations
- Social videos with kinetic captions, overlays, and music
- Docs-to-video, PDF-to-video, and site-tour explainers
- Reusable motion graphics for automated content pipelines
Frame.md
frame.md — your design system, ready for video.
Every brand has a design.md. None of them were written for a camera. frame.md is the missing translation layer: it takes your web-context design spec and inverts it for the frame — the same tokens, the same rules, but rewritten so an AI agent can compose a promo video without guessing at scale or reaching for web chrome.
The output is a DESIGN.md superset your whole toolchain can read. Atoms stay sacred. Composition stays free. Numbers come from the script.
Biennale Yellow |
BlockFrame |
Blue Professional |
Bold Poster |
Broadside |
Capsule |
Cartesian |
Cobalt Grid |
Coral |
Creative Mode |
Browse and remix them all at hyperframes.dev/design.
How It Works
Define a video as HTML. Add data attributes for timing and tracks. Use GSAP, CSS, Lottie, Three.js, Anime.js, WAAPI, or your own frame adapter for seekable animation.
<div id="stage" data-composition-id="launch" data-start="0" data-width="1920" data-height="1080">
<video
class="clip"
data-start="0"
data-duration="6"
data-track-index="0"
src="intro.mp4"
muted
playsinline
></video>
<h1 id="title" class="clip" data-start="1" data-duration="4" data-track-index="1">Launch day</h1>
<audio
data-start="0"
data-duration="6"
data-track-index="2"
data-volume="0.5"
src="music.wav"
></audio>
<script src="https://cdn.jsdelivr.net/npm/gsap@3/dist/gsap.min.js"></script>
<script>
const tl = gsap.timeline({ paused: true });
tl.from("#title", { opacity: 0, y: 40, duration: 0.8 }, 1);
window.__timelines = window.__timelines || {};
window.__timelines.launch = tl;
</script>
</div>
Preview instantly in the browser. Render locally or in Docker. The renderer seeks each frame in headless Chrome and encodes the result with FFmpeg, so the same input produces the same video.
HyperFrames Stack
HyperFrames is the open-source rendering engine, plus a growing set of tools around HTML-native video creation.
| Piece | Status | What it does |
|---|---|---|
| CLI | Available | Scaffold, preview, lint, inspect, and render local video projects |
| Core / Engine / Producer | Available | Parse compositions, drive headless Chrome, encode video, and mix audio |
| Catalog | Available | Reusable blocks and components for transitions, overlays, captions, charts, maps, and effects |
| Agent skills | Available | Teach coding agents the video-production patterns that generic web docs miss |
| Studio | Available, evolving | Browser surface for previewing and editing compositions |
| AWS Lambda rendering | Available | Deploy a distributed render stack and drive renders from your laptop or CI |
| hyperframes.dev | Available | Community playground for previewing, iterating, sharing, and rendering HTML-native video projects |
| frame.md | Available | Invert your design system for the camera — a DESIGN.md superset an agent can compose video from |
Catalog
Install ready-to-use blocks and components:
npx hyperframes add flash-through-white # shader transition
npx hyperframes add instagram-follow # social overlay
npx hyperframes add data-chart # animated chart
Browse the catalog at hyperframes.heygen.com/catalog.
Why HyperFrames?
- HTML-native: compositions are HTML files with data attributes. No React requirement, no proprietary timeline format.
- Agent-friendly: agents already write HTML, and the CLI is non-interactive by default.
- Deterministic: same input, same frames, same output. Built for CI, regression tests, and automated rendering.
- No build step: an
index.htmlcomposition plays as-is and can be previewed directly in the browser. - Adapter-based animation: bring GSAP, CSS animations, Lottie, Three.js, Anime.js, WAAPI, or a custom runtime.
- Open source: Apache 2.0 license, with no per-render fees or commercial-use thresholds.
HyperFrames vs Remotion
HyperFrames is inspired by Remotion. Both tools render video with headless Chrome and FFmpeg. The main difference is the authoring model: Remotion's bet is React components; HyperFrames' bet is plain HTML that humans and agents can both write easily.
| HyperFrames | Remotion | |
|---|---|---|
| Authoring | HTML + CSS + seekable animation | React components |
| Build step | None; index.html plays as-is |
Bundler required |
| Agent handoff | Plain HTML files | JSX / React project |
| Library-clock animations | Seekable, frame-accurate via adapters | Wall-clock animation patterns need care |
| Distributed rendering | Local and AWS Lambda render paths | Remotion Lambda, mature cloud renderer |
| License | Apache 2.0 | Source-available Remotion License |
Read the full comparison in the HyperFrames vs Remotion guide.
Documentation
Full documentation: hyperframes.heygen.com/introduction
Packages
| Package | Description |
|---|---|
hyperframes |
CLI for creating, previewing, linting, and rendering compositions |
@hyperframes/core |
Types, parsers, generators, linter, runtime, and frame adapters |
@hyperframes/engine |
Seekable page-to-video capture engine using Puppeteer and FFmpeg |
@hyperframes/producer |
Full rendering pipeline for capture, encode, and audio mix |
@hyperframes/studio |
Browser-based composition editor UI |
@hyperframes/player |
Embeddable <hyperframes-player> web component |
@hyperframes/shader-transitions |
WebGL shader transitions for compositions |
@hyperframes/aws-lambda |
AWS Lambda SDK and deployment surface for distributed renders |
Community
HyperFrames is used in production at HeyGen, with community examples from teams like tldraw, TanStack, and others in ADOPTERS.md. Open a PR if your team is using HyperFrames.
- Questions and ideas: Discord
- Bugs and feature requests: GitHub Issues
- User research: Book a casual 30-minute conversation with the HyperFrames team — no preparation or sales pitch
- Security reports: SECURITY.md
- Contributions: CONTRIBUTING.md
Development Note
The repo uses Git LFS for golden regression-test baselines under packages/producer/tests/**/output.mp4 (about 240 MB of .mp4 files). If you're cloning the full repo for development, install Git LFS first:
# macOS
brew install git-lfs
# Ubuntu / Debian
sudo apt install git-lfs
# Windows
winget install GitHub.GitLFS
# Then, once per machine
git lfs install
If you only need source files, you can skip LFS content:
GIT_LFS_SKIP_SMUDGE=1 git clone https://github.com/heygen-com/hyperframes.git