Elysian Shadows

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#!/bin/bash
#
# start it by going time-lapse.sh start will keep running till termination
# then issue time-lapse.sh compile <optinal music file>

interval=5

arg=$1

if [ "$2" ]; then
music=$2
else
music=
fi

if [ -z $arg ]; then
	exit 0
fi

if [ $arg = "start" ]; then
	echo starting in $interval seconds
	sleep $interval
	while true
	do
		touch counter #incase this is our first run
		counter=`cat counter`
		counter=`expr $counter + 1`
		scrot temp.png
		convert -quality 100 -resize 800x temp.png `printf "%06d" $counter`.jpg
		echo "frame: $counter"
		echo $counter > counter
		sleep $interval
	done
elif [ $arg = "compile" ]; then
	if [ "$music" ]; then
		ffmpeg -shortest -qscale 3 -r 24 -i %06d.jpg -i "$music" -r 24 video.avi
	else
		ffmpeg -shortest -qscale 3 -r 24 -i %06d.jpg -r 24 video.avi
	fi
fi