A convert shell script from ts to mp4 with ffmpeg

manyconvert_ffmpeg

#!/bin/bash

CMDNAME=`basename $0`

dir_d="/mnt/d/ほげ"
dir_f="/mnt/f/ふが"
directory="$dir_f"
while getopts dfn: OPT
do
  case $OPT in
    "d" ) directory="$dir_d" ;;
    "f" ) directory="$dir_f" ;;
    "n" ) VAL_N="$OPTARG" ;;
#      * ) echo "Usage: $CMDNAME [-d] [-f] [-n VALUE]" 1>&2
#          exit 1 ;;
  esac
done
src_ext="ts"
dst_ext="mp4"
files=$directory"/*."$src_ext
MAX_FILES=${VAL_N:-100}
#echo $MAX_FILES
#echo $directory
file_counter=0

for file_path in $files ; do
  if [ -f "$file_path" ] ; then
    file_full_name="${file_path##*/}"
    file_name=("${file_full_name%.*}")
    file_counter=$((file_counter + 1))
    if [ ! -f "$directory/$file_name.$dst_ext" ] ; then
      command="ffmpeg -i \"$directory/$file_name.$src_ext\" -strict -2 -pix_fmt yuv420p -b:v 0.5M \"$directory/$file_name.$dst_ext\""
      echo $file_counter : $file_name
      eval $command
      if [ $file_counter -ge $MAX_FILES ] ; then
        break
      fi
    else
      echo $file_counter : $file_name : skipped.
    fi
  fi
done