#!/bin/bash
#
# 211027

LOG_file=aaa.log

for i in * ; do

   if test -e $i; then
      newname=$i
      newname=${newname%.*}.wav
      if test ! -f $newname.wav; then

         ext=${i#*.}
#           echo "ext: $ext"
         if ( test $ext = mp4  ) ; then
#            echo "extract $i ${i%%.*}.$ext to ${i%%.*} " | tee -a $LOG_file

            #  echo "ffmpeg -i $i -ab 128k -ar 44100 $newname.wav"
            echo "ffmpeg -i $i -ab 192k -ar 44100 $newname" | tee -a $LOG_file
            echo
            #  mplayer -dumpaudio "$i" -dumpfile "$newname"
            ffmpeg -i "$i" -ab 192k -ar 44100 "$newname"
         fi
      fi
   else
      echo "File $newname.wav just exists. Next!"| tee -a $LOG_file
   fi
done