[FFmpeg-user] Prores 444 being detected by quicktime as 422?

[Carl Eugen Hoyos]

Robert Krüger <krueger <at> lesspain.de> writes:

> I hacked the codec not to override the fourcc if it is 
> set on the command line and the result was detected as 
> Prores 4444 bei Quicktime but the alpha information was 
> lost.

The encoder currently does not support alpha...

> I verified by making a clip with alpha

... which is related to the fact that the decoder does not 
support it because afaik we don't have a sample.

Please provide a sample, Carl Eugen