Convert mp4 to mp3 under linux

 
#!/bin/bash
clear

# Example: ./mp4ToMp3.sh ~/Downloads

for entry in "$1"/*.mp4
do
  
  ext="${entry##*.}"
  filename="${entry:0:${#entry} - ${#ext}}"
  mp3file="${filename}mp3" 
  echo "$entry ===> $mp3file"
  ffmpeg -i "$entry" -vn -acodec libmp3lame -ac 2 -ab 160k -ar 48000 "$mp3file"
done