[FFmpeg-user] Screencast produces only gray output

[Carl Eugen Hoyos]

 <look <at> ebookring.net> writes:

> ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 20 -s 1280x800 
> -i :0.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast 
> -crf 0 -threads 0 output.mkv

If you don't want us to guess, please provide complete, 
uncut console output.

If you'd like a guess, add -pix_fmt yuv420p.
(Your original output file plays fine, your playback 
application is buggy / misses features.)

Carl Eugen