#!/bin/bash

if [[ $# != 4 ]]; then
    echo "USAGE: ./fcut.sh input.mp4 00:12:34 00:23:45 output.mp4"
    exit 1
fi

tsub(){
    diff=$(( $(date -d "$1" "+%s") - $(date -d "$2" "+%s") ))
    echo $diff
}

ffmpeg -ss $2 -i $1 -t $(tsub $3 $2) -c:a libfdk_aac -ab 192k -ar 44100 -c:v h264 -r 25 -s 1280x720 $4