Count total length of videos in current dir

lengthsum.sh

#!/bin/sh

if [ -z "$1" ]; then
	echo "Missing argument: dir"
	exit
fi

if [ -z "$2" ]; then
	echo "Missing argument: format"
	exit
fi

DIR="$1"
FORMAT="$2"

total=0

IFS=$'\n'
for file in $(find $DIR -name "*.$FORMAT"); do
	length=$(ffmpeg -i "$file" 2>&1 | grep "Duration" | cut -d ' ' -f 4 | sed s/,// | awk '{ split($1, A, ":"); print 3600*A[1] + 60*A[2] + A[3] }')
	total=$(echo "$total + $length" | bc)
	echo "$file $length"
done

echo $total