Open-source framework for rendering HTML compositions into MP4 videos, built for AI agents and automated pipelines.
HyperFrames is an open-source video rendering framework by HeyGen that turns HTML compositions into MP4 videos. You define your video as HTML files with data attributes specifying timing, layers, and animations, then render deterministically to video. It supports GSAP, Lottie, CSS, and Three.js animations through its Frame Adapter pattern, includes 50+ ready-to-use blocks, and has a live browser preview with hot reload.
Designed agent-first for automated video pipelines — works with Claude Code, Cursor, and Gemini CLI. Apache 2.0 licensed.
Pricing model: Free
Common questions about HyperFrames
Safari playback of edited films keeps its audio running, and renders can now skip re-encoding the picture for a single full-frame video. HyperFrames covers both in its v0.8.226 release.
Producer: an opt-in video layer passthrough for a lone full-canvas video. Studio: a host app that draws its own loader can turn off both of Studio's preview loaders. Core: WebKit plays bare audio from a decoded buffer on the audio clock. Core: the playback health reading now says which clock the film followed.…
HyperFrames v0.8.225 fixes dropped frames in exports that include nested video clips. Clips that start on a frame boundary now export every source frame.
Engine: nested video clips that start on a frame boundary no longer lose frames when exported. CLI: --mask boxes are now filled from the picture behind them, and generated clips are cropped to the requested aspect. CLI: billing top-up opens the pricing page.…
HyperFrames v0.8.222 lets you export part of a video as its own MP4. Use --start and --end with the render command to choose the span.
Capture now retries without WebGL when a page stops responding. Lint also warns when a font or image URL in a linked stylesheet points at the wrong folder, and both --variables-file and file paths passed to --variables work again.
Original source
The HyperFrames CLI now keeps its login separate from the HeyGen CLI, so signing in to one no longer overwrites the other's login.
After upgrading to v0.8.218, existing users need to run hyperframes auth login once. Cloud work then bills to your HyperFrames plan. A HEYGENAPIKEY still works as before.
Original source
HyperFrames v0.8.214 lets a whole lane of clips share a colour grade through one hf-color-group element. You can change the lane's grade by editing that element.
You can also bake a grade into a 3D LUT as a .cube file. HyperFrames says the LUT matches the preview.
Original source
HyperFrames v0.8.209 fixes Studio previews loading project media differently from renders. Root-path media, images and CSS now load as they do during rendering, and HDR clips preview and snapshot the way their SDR exports render.
Phone videos with an undecodable first audio track can now pass checks, preview and render. Audio effects also use the same Chrome launch process as other renders, including the sandbox retry.
Original source
HyperFrames v0.8.206 fixes mismatches between preview and render: paused video shows the same frame, and PNG colour tags no longer change pixels in preview, check, snapshot or render.
HEIC photos now work in compositions through conversion to JPEG at compile time. The CLI's check command also catches audio that a render would lose or play as silence.
Compositions without a timeline-registering script no longer wait 45 seconds at setup.
Original source
HyperFrames v0.8.200 mounts and draws only the scenes near the preview playhead. HyperFrames says this makes long projects faster to scrub through.
Renders also keep fast capture on for frames untouched by a shadow, blur or clip effect. Capture browsers are allocated by a chunk's frame cost rather than its frame count.
Original source
HyperFrames says v0.8.193 makes cloud renders of long, cut-heavy edits finish several times faster at the same or lower cost.
The release also restores audio rendering on FFmpeg 4.4 and fixes Windows file locks causing renders to fail. In Studio, switching scenes no longer keeps the previous preview window in memory, and a history restore refuses to remove every tracked file.
Original source
HyperFrames v0.8.190 lets motion blur automatically choose a cheaper drawing method where it can. When capture blur can't run, it falls back to per-element filters.
Studio gets a preview seek bar, and an idle editor stops waking the GPU four times a second. Renders also use less memory by sharing the video frame cache budget across capture workers and preparing long audio mixes a few clips at a time.
Original source
Official videos and tutorials for HyperFrames.
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