Convert mp4 to mp3 linux

#!/bin/sh
 
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
for f in *
do
  echo "$f"
  ffmpeg -i "$f" -vn \
       -acodec libmp3lame -ac 2 -ab 160k -ar 48000 \
      "${f%.mp4}.mp3"
done
IFS=$SAVEIFS