Bash Script to Cut up pieces of video files in a directory using FFMPEG

videoBites

#!/bin/bash
FILES="/Users/yair/Movies/SoundsOfThePlanets/*.mp4"

#this script creates small pieces of videos out of a directory of .mp4 
i=0
for f in $FILES
do
  echo "Processing $f file..."
  i=`expr $i + 1`
  # take action on each file. $f store current file name
  for num in {1..13}
  do
   	echo "Number: $num"
	#set the start time of each piece and run ffmpeg
	START=`expr $num \* 22`
  	ffmpeg -i "$f" -vcodec copy -acodec copy -ss $START -t 0.865 grains/$i-$num.mp4

  done
done