#!/bin/bash

# First - check arguments
if [[ $# = 0 ]]; then
  # Case number of imput arguments = 0
  echo "$(basename $0): missing directory operand";
  echo "Try '$0 --help' for more information.";
  exit 1;
elif [[ $1 = "--help" ]]; then
  # Case input argument --help
  echo "Help here";
  exit 0;
elif [[ ! -d $1 ]]; then
  # Check if first parameter is directory
  echo "First parameter should be directory.";
  exit 1;
fi

workdir=$1;

# Go to working dir
cd "$workdir";

for file in *; do
  shopt -s nocasematch
  filename=$(basename "$file")
  extension="${filename##*.}"
  case $extension in
    mp4)
      to=`mediainfo "$file" | grep "UTC" -m 1 | awk '{print $5" "$6}'`
      mv "$file" "$to.mp4"
    ;;
  esac
  shopt -u nocasematch
done