[FFmpeg-user] HD > SD Down-Convert Prores Color

[Kevin Wells]

> > -vf format=uyvy422,colormatrix=bt709:bt601,scale=720:576:flags=lanczos
> 
> This can't be correct unless you know (tested) 
> something I don't know (didn't test).

This is the closest I can get, if I emit the format=uyvy422 then the output file contains tiny green artefacts (easily visible my applying a gamma filter in FCP and turning it right up).What's the answer here then to down-convert from HD Prores HQ to SD Prores HQ?