[Cin] DNxHR presets

[Andrea paz]

Yes, you are right, ffmpeg does not handle 12-bit DNxHR. Thanks. The
options it offers (yuv422p; yuv422p10le; yuv444p10le and gbrp10le) are
the only ones possible and therefore they are the right ones. I
enclose the changes.
The only problem is in using DNxHR_444: if you set the pixel format
yuv444p10le the resulting file is RGB; if you set gbrp10le the
resulting file is YUV. So the opposite happens! If you can verify
this, please do me a favor.

I renamed the audio preset DNxHR_pcm_s24.mov to DNxHR_pcm_s32.mov
because in reality the only option it offers is 32-bit sampling and
not 24-bit sampling.
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