Salam all,
this about how to convert a flac audio file to a mp3 format to gain the size reduce
you need to have the following packages installed: flac , lame
for ubuntu you can install them by:
$ sudo apt-get install flac lame
for defora
# yum install flac lame
then to convert a flac file to mp3
$ flac -cd filename.flac | lame -h – filename.mp3
