[FFmpeg-devel] [patch] - prores: skip alpha if present

[Jonne Ahner]

Decoding prores with alpha leads to decode errors.
(ac tex damaged)

Samples
http://213.180.83.85/samples/alpha2.mov
http://213.180.83.85/samples/alpha3.mov

Slice header is 2 bytes larger. Seems to be optional v_data_size.
If so this patch prevents it from trying to interpret extra data as chroma

I dont have many samples of alpha so I cant test further.