[FFmpeg-user] Screencast produces only gray output

Carl Eugen Hoyos cehoyos at ag.or.at
Tue Nov 20 10:54:21 CET 2012

 <look <at> ebookring.net> writes:

> $ ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 10 -s 1280x800 
> -i :0.0 -acodec pcm_s16le -vcodec libx264 -pix_fmt yuv420p 
> -preset ultrafast -crf 0 -threads 0 output.mkv

> frame=  230 fps=7.1 q=0.0 Lsize=   10363kB time=00:00:23.00 

This looks very suspicious, please try with a significantly 
lower resolution or -r 5.

Carl Eugen

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