[FFmpeg-user] fast video codec for screen casting

[Carl Eugen Hoyos]

dE . <de.techno <at> gmail.com> writes:

> Using -f null I get full performance (upto 100 FPS) till I set -r 100 
> for the input.

Right, I forgot that 30 is default (iiuc)

> Above 100 I only get 3 or 4 FPS. So everything is good 
> with -f null.
> 
> I think I did post the output -
> 
> ffmpeg -f alsa -i default -f x11grab -s 1280x800 -i :0.0 -threads 1 
> -qscale 2 -threads 1 -b 20000k -vcodec mpeg1video -ar 44100 -ac 2.0 
> -acodec pcm_s16le out.avi

Sure, but the command for which output (or info about fps) is needed is:
ffmpeg -f x11grab -s 1280x800 -i :0.0 -f null -qscale 2 -threads 1 -vcodec
mpeg1video -

Carl Eugen