M4A para MP3

sudo apt-get install gstreamer0.10-ffmpeg
sudo apt-get install gstreamer0.10-gl
sudo apt-get installgstreamer0.10-plugins-good
sudo apt-get install gstreamer0.10-pitfdll
sudo apt-get install gstreamer0.10-plugins-bad
sudo apt-get install gstreamer0.10-plugins-bad-multiverse
sudo apt-get install gstreamer0.10-plugins-ugly
sudo apt-get install gstreamer0.10-plugins-ugly-multiverse
sudo apt-get install gstreamer0.10-sdl
sudo apt-get install soundconverter