total-media-durations.sh

#!/bin/bash

function displaytime {
    local T=`echo $1 / 1 | bc`
    local D=$((T/60/60/24))
    local H=$((T/60/60%24))
    local M=$((T/60%60))
    local S=$((T%60))
    (( $D > 0 )) && printf '%d days ' $D
    (( $H > 0 )) && printf '%d hours ' $H
    (( $M > 0 )) && printf '%d minutes ' $M
    (( $D > 0 || $H > 0 || $M > 0 )) && printf 'and '
    printf '%d seconds\n' $S
}

export SUM=0

find | while read file
do
    duration=`ffprobe -i "$file" -show_entries format=duration -v quiet -of csv="p=0"`
    if [[ $? -eq 0 ]] && [[ $duration != "N/A" ]]
    then
        SUM=`echo $SUM + $duration | bc -l`
        echo $SUM $file $duration
        displaytime $SUM
    fi
done