[FFmpeg-user] Test if ProRes 4444 are real 12bit

[Christoph Gerstbauer]

Am 25.01.15 um 13:38 schrieb Robert Krüger:
> On Sat, Jan 24, 2015 at 7:11 PM, Christoph Gerstbauer <
> christophgerstbauer at gmail.com> wrote:
>
>> Hello,
>>
>> I want to test ifthe ProRes4444 of the ARRI Alexa are real 12 Bit? Is
>> there method to proove it with ffmpeg?
>>
>> AS far as I know ffmpeg is only ready to open prores with yuv422p10le and
>> yuv444p10le (10bit), but no 12bit.
>>
>
> Last time I checked/tried, it wasn't possible. The best I got was a
> statement by one developer that, looking at the code, it would be
> theoretically possible to support more than 10bit, so my understanding is
> that ffmpeg currently destroys any headroom beyond 10bit but since I am not
> qualified enough to read the code, I cannot be 100% sure.
Hi Robert thank you.

The interesting thing about this is:

If I give ffmpeg the option to interpret the file as PRORES it can be 
opened.

ffmpeg -vcodec prores -i inputfile .....

best regards
chris