Sven C. Dack wrote:
The first thing you can do is to reduce the frames that get grabbed per
second. try this:
$ ffmpeg -f x11grab -s 1920x1080 -i :0.0 -f rawvideo /dev/null
(I.e. 30fp/s, 2gbit/s)
Seems to default to 30 even if you can go higher.
-f null -
rather than -f rawvideo /dev/null may be more representative.
Either way unless you are using libx264rgb then you would need to add
-pix_fmt yuv420p or for h/w enc -pix_fmt nv12 to bench properly - and
of course if doing s/w enc you still won't know without adding that in.
Even then s/w enc will be wildly variable cpu usage wise depending on
what it's encoding ...
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