#!/bin/sh

INFO=$(xwininfo -frame)

WIN_GEO=$(echo $INFO | grep -oEe 'geometry [0-9]+x[0-9]+' | grep -oEe '[0-9]+x[0-9]+')
WIN_XY=$(echo $INFO | grep -oEe 'Corners:\s+\+[0-9]+\+[0-9]+' | grep -oEe '[0-9]+\+[0-9]+' | sed -e 's/\+/,/' )

ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s $WIN_GEO -i :0.0+$WIN_XY -acodec pcm_s16le -vcodec libx264 -vpre lossless_ultrafast -threads 0 -y output-single.mkv

Linux video screencasting with audio

video, linux

Bash