[FFmpeg-user] Best way to record video on a computer with a really bad CPU yet really good GPU?

[Carl Eugen Hoyos]

2016-09-04 10:16 GMT+02:00 Sven C. Dack <sven.c.dack at sky.com>:

> $ ffmpeg -f x11grab -s 1920x1080 -i :0.0 -f rawvideo /dev/null
> (I.e. 30fp/s, 2gbit/s)
>
> This will tell you how fast you can grab at the most. Here the
> screen size is set to be 1920x1080.

> Then reduce it with the "-r" option:

No!
Please see the examples in the fine documentation:
https://www.ffmpeg.org/ffmpeg-devices.html#x11grab

See also:
https://ffmpeg.org/ffmpeg-all.html#Video-Options

Carl Eugen