If you have your urpmi sources set up, including a plf source, the answer is on your own computer. Simply fire up Mandrake control center, open "install software" and in the search bar type what you are looking for. Use bare minimum of words possible. This is what you will find if you type in "ogg". Along with many other ogg appz. Just highlight them to get a description of what it does.
Size: 16 KB
Summary: Convert ogg music files to mp3 music files.
Description: Perl script to convert ogg files into mp3 format. Note that the conversion is lossy.
This is basically an inverted version of Nathan Walp's mp32ogg
This is Alpha, so be careful.