ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s 1280x800 -i :0.0 -acodec pcm_s16le -vcodec libx264 -vpre lossless_ultrafast -threads 0 ./Desktop/mydesktop.mkv
ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s 1280x800 -i :0.0 -acodec pcm_s16le -vcodec libx264 -vpre lossless_ultrafast -threads 0 ./Desktop/mydesktop.mkv