[FFmpeg-devel] [PATCH]: libavcodec/webp

Pascal Massimino pascal.massimino at gmail.com
Thu Sep 18 08:45:17 CEST 2014


the webp lossless doc was unclear regarding palette index falling out of
See issue #206 [1] for the bug report.
The solution retained was to treat out-of-range index as color 0x00000000,
so we could keep the speed-up in libwebp (we use fake extra entries in the
cmap to handle out-of-bound values without the extra branch).

The doc was clarified (along with few other loose ends) in patch #71605 [2]
Attached is the fix for ffmpeg's webp decoder to treat out-of-bound index
as transparent-black instead of reporting an error.

note: the bug entry has a test webp file to exercise this feature/patch, in


[1] https://code.google.com/p/webp/issues/detail?id=206
[2] https://gerrit.chromium.org/gerrit/#/c/71605/
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