[Libav-user] Difficulty decoding libvpx VP8 with Alpha as RGBA

[Gonzalo Garramuño]

El 31/1/21 a las 20:08, Craig Turner escribió:
> You are absolutely right - the format is AV_PIX_FMT_YUV420P, so it 
> seems the alpha channel is not being decoded. Is there something 
> specific I need to do to ensure it does indeed get decoded?
>
grep'ping thru the ffmpeg's libavcodec sources for vp*.c it seems only 
vp56 supports alpha.