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

[Robert Krüger]

On Wed, Sep 12, 2012 at 11:47 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> 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
The sample I have is one frame long and 220k in size. How do you want
me to give it to you?