use ffmpeg to transform avi to mp3 on mac

  465  ./ffmpeg -i /Users/peterpeng/video/六人行/Season1/\[六人行\].Friends.01x01.The.One.Where.Monica.Gets.A.New.Roommate.DVDRip.AC3.3.2ch.JOG.avi -ss 00:00:55.000 -b:a 128k S1E01.mp3

  469  ./ffmpeg -i /Users/peterpeng/video/六人行/Season1/\[六人行\].Friends.01x02.The.One.With.The.Sonogram.At.The.End.DVDRip.AC3.3.2ch.JOG.avi -b:a 128k S1E02.mp3

batch transform for the avi in a directory:

for i in *.avi;

  do name=`echo $i | cut -d'.' -f3`;

  echo "transfroming ...$name";

  /Users/peterpeng/Downloads/ffmpeg -i $i -b:a 128k $name.mp3

done