[FFmpeg-user] How to choose pixfmt output for video generator

[Martin Vignali]

Hello,

I would like to use a generator for testing
Some generator, seems to have several pix fmt supported, but can't find the
way to choose one

For example allyuv seems to support yuv444p, gbrp

./ffmpeg -f lavfi -i allyuv=rate=5:duration=1 -pix_fmt yuv444p -f null -
-loglevel debug
==> Output yuv444p

./ffmpeg -f lavfi -i allyuv=rate=5:duration=1 -pix_fmt gbrp -f null -
-loglevel debug
==> Following log, seems to output yuv444p then convert to gbrp

Thanks

Martin