getMP4Duration

#!/bin/bash

which ffmpeg > /dev/null 2>&1
[ $? -ne 0 ] && echo "Cannot find ffmpeg" && exit 1

IFS="
"

if [ $# -eq 1 ]
then
    DIR=$1
else
    DIR="."
fi

cd $DIR

HOURS=0
MINS=0
SECS=0

for FILE in $(find . -iname '*.mp4'| sort -n)
do
    [ -f $FILE ] || continue
    F=$(echo $FILE | sed 's/^.\///g')
    echo -n "$F "
    DURATION=$(ffmpeg -i "$FILE" 2>&1 | grep Duration | cut -d ' ' -f 4 | sed s/,// | cut -f1 -d.)
    echo $DURATION
    HOUR=$(echo $DURATION | cut -f1 -d: | sed 's/^0//')
    MIN=$(echo $DURATION | cut -f2 -d: | sed 's/^0//')
    SEC=$(echo $DURATION | cut -f3 -d: | sed 's/^0//')
    HOURS=$(( $HOURS + $HOUR ))
    MINS=$(( $MINS + $MIN ))
    SECS=$(( $SECS + $SEC ))
done

if [ "$HOURS:$MINS:$SEC" = "0:0:0" ]
then
    echo 00:00:00
fi

if [ $SECS -gt 59 ]
then
    M=$(( $SECS / 60))
    SECS=$(( $SECS % 60))
    MINS=$(( $MINS + $M ))
fi
if [ $MINS -gt 59 ]
then
    H=$(( $MINS / 60))
    MINS=$(( $MINS % 60))
    HOURS=$(( $HOURS + $H ))
fi

[ $SECS -lt 10 ] && SECS="0$SECS"
[ $MINS -lt 10 ] && MINS="0$MINS"

echo TOTAL: ${HOURS}:${MINS}:${SECS}