[FFmpeg-user] WebM alpha plane decode

[Carl Eugen Hoyos]

Vin Kemp <vinkemp <at> gmail.com> writes:

> I need to decode WebM videos with an alpha channel

As said, this may be less easy than expected even with 
the external decoder because iirc the alpha channel is 
not part of the bitstream but has to be provided by 
the demuxer and the sidedata has to be used by the 
decoder to produce yuva output.

Carl Eugen