Hi everyone here is a short guide on how to convert audio and video in linux
Go to terminal and go directly to the directory where you files are located. When your there type in mencoder MyMovie.mpg -ovc lavc -oac mp3lame -o MyMovie.flv and press enter and done.
NOTE: MyMovie.mpg is the original file and MyMovie.flv is the converted file, i’m not really sure about what extension works but most of my conversion task is done using this few lines of code.