# ffmpeg -video_size 1920x1080 -framerate 30 -f x11grab -i :0.0 -f pulse -i alsa_output.pci-0000_00_1b.0.analog-stereo.monitor output.mp4

# ffmpeg -f pulse -i default -f x11grab -r 30 -s 1920x1080 -i :0.0 -c:v libx264 -preset veryfast -crf 23 -c:a aac output.mp4