# HyperFrames v0.8.34

By Steven Van · 2026-09-10

New guidance in the rendering docs explains why ffprobe's pix\_fmt reading alone can't confirm a WebM export lost its alpha channel.

The [HyperFrames](<https://creatorstoolbox.com/resources/hyperframes>) rendering guide now covers a gotcha in checking whether a WebM export kept its alpha channel. Seeing pix\_fmt=yuv420p from ffprobe does not by itself mean transparency was lost: FFmpeg's default VP9 decoder can produce an opaque image even from a file that still has alpha.

The [updated docs](<https://github.com/heygen-com/hyperframes/commit/78e84a9ca8de3ba490f70a065fa8e1781c7847fb>) show how to select the alpha-aware decoder explicitly before the input, then view the resulting frame over a checkerboard or contrasting background. They also suggest comparing it against the composition's PNG-sequence output, to check whether transparency was missing before video encoding rather than lost afterward.

[![](<https://opengraph.githubassets.com/839f8ffb2c28033f93deecb36000503ffcaa83ad0bc69c2e3da8776676ffb9a3/heygen-com/hyperframes/commit/78e84a9ca8de3ba490f70a065fa8e1781c7847fb>)](<https://github.com/heygen-com/hyperframes/commit/78e84a9ca8de3ba490f70a065fa8e1781c7847fb>)

![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>)

[Original source](<https://github.com/heygen-com/hyperframes/commit/78e84a9ca8de3ba490f70a065fa8e1781c7847fb>)

[Read HyperFrames v0.8.34 on Creators Toolbox](<https://creatorstoolbox.com/blog/hyperframes-hyperframes-v0-8-34>)

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Canonical source: https://creatorstoolbox.com/blog/hyperframes-hyperframes-v0-8-34