Create a screencast using ffmpeg with audio recording and webcam capture on bottom right

screencast-audio-webcam.sh

#!/bin/bash
T="$(date +%d-%m-%Y-%H-%M-%S)".mkv
if [ $# -gt 0 ]; then
	if echo $1 | grep '\....$' > /dev/null; then 
		T=$1
	else
		T=$1.mkv
	fi
fi
# echo $T
ffmpeg -f alsa -i pulse -f x11grab -s `xdpyinfo | grep 'dimensions:'|awk '{print $2}'` -r 25 -i :0.0 -f video4linux2 -i /dev/video0 -filter_complex '[2:v]scale=480:-1[cam];[1:v][cam]overlay=W-w-10:H-h-10' -ab 192 -acodec pcm_s16le -qscale 0 $HOME/Screencasts/$T