FFMPEG - Video Screen Capture

#!/bin/bash
cd $HOME/Videos/
SavePath=$(zenity --file-selection --save --confirm-overwrite)
echo "Saving video to $szSavePath"

INFO=$(xwininfo -frame)

WIN_GEO=$(echo "$INFO"|grep -e "Height:" -e "Width:"|cut -d\: -f2|tr "\n" " "|awk '{print $1 "x" $2}')
WIN_POS=$(echo "$INFO"|grep "upper-left"|head -n 2|cut -d\: -f2|tr "\n" " "|awk '{print $1 "," $2}')

ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -s $WIN_GEO -r 15 -i :0.0+$WIN_POS -r 15 -acodec pcm_s16le -sameq "$SavePath.avi"


echo "$WIN_GEO -i :0.0+$WIN_POS -acodec"
echo "$WIN_POS"