HyperFrames v0.8.34
By Steven Van ·
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 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 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.