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

[Paul B Mahol]

On 10/9/18, Martin Vignali <martin.vignali at gmail.com> wrote:
> 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

allyuv supports only yuv444p,

on other hand yuvtestsrc supports more yuv format, for more info consult source.