[FFmpeg-user] HD > SD Down-Convert Prores Color
Carl Eugen Hoyos
cehoyos at ag.or.at
Wed May 13 13:13:31 CEST 2015
Kevin Wells <kevwells <at> hotmail.co.uk> writes:
> what platform are you using, Windows, Mac?
I suggest one more guess.
(But it doesn't matter: FFmpeg runs fine on Windows
and Mac, I test regularly myself.)
> In any application if you open the video and turn the
> gamma up you will see big problems.
FFmpeg does contain filter(s) that allow gamma
correction, how do I reproduce with FFmpeg?
> If you open the resulting video (SD_BARS.mov) up in
Sorry, but Photoshop is not a development tool I use
> ffmpeg -i HD_BARS.mov -map 0:v
> -vf colormatrix=bt709:bt601,scale=720:576:flags=lanczos
> -vcodec prores_ks -profile:v 3 -vtag apch -vendor ap10
> -pix_fmt yuv422p10le -f mov SD_BARS.mov
I already told you that if the issue is reproducible
with -vcodec prores (you claimed it is), please use it.
Is encoding with prores needed to reproduce the issue,
or are only seeing a problem with the software scaler?
Why didn't you use the command line I provided and that
is not bound to some software we don't know much about
to check the output of FFmpeg?
Please try to fix your mailer, Carl Eugen
More information about the ffmpeg-user