Screen Cast Linux 4

$ ffmpeg -y -f alsa -ac 2 -i pulse -f x11grab -r 30 -s `xdpyinfo | grep 'dimensions:'|awk '{print $2}'` -i :0.0 -acodec pcm_s16le my_output.wav -an -vcodec libx264 -vpre lossless_ultrafast -threads 0 my_output.mp4