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

[Carl Eugen Hoyos]

Roger Pack <rogerdpack2 <at> gmail.com> writes:

> >> Incompatible pixel format 'yuv444p10le' for codec 'prores',
> >> auto-selecting format 'yuv422p10le'
> >
> > Only the slower alternative prores encoder "prores_kostya"
> > supports yuv444.
> 
> His question was, even using prores_kostya with yuv444p10le, the
> resultant file shows as yuv44p10le in ffmpeg, but in QT Player, it
> says "yuv420p" when playing it.

Apart from the fact that this is hard to believe, I was unable to 
find that claim in the original mail.

Carl Eugen