ffmpeg_imseq_to_video () {
	if [ "$#" -eq 0 ]
	then
		echo 'Usage: ffmpeg_imseq_to_video $framerate $img_regex $output_file'
		return
	fi
	framerate=$1
	img_regex=$2
	output_file=$3
	ffmpeg -framerate 5 -i $img_regex -c:v mpeg4 -qscale:v 2 -r 5 -pix_fmt yuv420p $output_file
}