# HyperFrames v0.8.222

By Steven Van · 2026-10-30

Render can now export a single span as its own MP4, and capture retries without WebGL, so more exports finish in this HyperFrames release.

Render in [HyperFrames](<https://creatorstoolbox.com/resources/hyperframes>) v0.8.222 can now output just one span of a film. --start and --end render only that span as its own MP4. The release also adds a WebGL fallback for capture and a new lint warning for stylesheet paths.

## Features

- **Render:** --start and --end render only that span of the film as its own MP4.

- **Lint:** warns when a url() in a linked stylesheet does not resolve beside it, such as a font or image pointing at the wrong folder.

- **Telemetry:** render\_complete splits capture time into seek, page, screenshot and encoder wait.

- **CLI:** review notes name the command that reviews the cuts inside a sub-composition.

- **CLI:** beats analyses an audio or video file given directly.

## Fixes

- Capture retries without WebGL when a page stops answering, so more exports finish.

- history show --diff names a changed video or audio file instead of refusing.

- A brace-stripped JSON flag value now points the user at the file and stdin forms.

- Render telemetry names content gates instead of calling them disabled.

- A font declared in the project's root stylesheet now counts for its sub-compositions in lint.

## Variables files read again

One fix in the release has [its own commit](<https://github.com/heygen-com/hyperframes/commit/6f2b072275b6107c253fd61edebe107cbd3c8275>). Both --variables-file and a path passed to --variables had stopped reading the file, and they read it again. The change is in how the JSON flag helper merges its default and supplied file and stdin readers. A new test writes a vars.json containing {"title":"Hello"} and checks that both flag forms resolve to those variables.

![HyperFrames](<https://www.google.com/s2/favicons?domain=hyperframes.heygen.com&sz=128>)

HyperFrames

Open-source framework for rendering HTML compositions into MP4 videos, built for AI agents and automated pipelines.

[View HyperFrames →](<https://creatorstoolbox.com/resources/hyperframes>)

Sources

[Original source](<https://hyperframes.heygen.com/changelog#hyper-frames-v0-8-222>)

[Read HyperFrames v0.8.222 on Creators Toolbox](<https://creatorstoolbox.com/blog/hyperframes-hyperframes-v0-8-222>)

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Canonical source: https://creatorstoolbox.com/blog/hyperframes-hyperframes-v0-8-222