Comments (1)
I thought it might be nice for wuffs_base__magic_number_guess_fourcc
to discriminate lossy from lossless. But you're right that that's not 100% do-able (when looking at a fixed number of opening bytes) because of VP8X and its optional but arbitrarily long ICCP chunk before we hit the image data bitstream.
If I'm reading that linked WebP spec right (pretty HTML version is at https://developers.google.com/speed/webp/docs/riff_container), an animated WebP can actually mix lossy and lossless between frames.
As you said, we should probably just group them all as "WEBP".
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Related Issues (20)
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