Converting audio formats via PHP? (A long shot...)

[RadioGeek]

Does anyone know of a way (either with PHP or some nix server-side solution) that can convert .ra (real audio) files to *.mp3 files? I have scoured the web and can't find much about the subject (ostensibly because RealAudio is proprietary and protected), but I haven't found much.

Surely there must be a way.

Thanks in advance.

[thoand]

Maybe there are a *nix program that can do this job, and then use PHPs system() function.

I don't think there are any libraries for PHP doing this job yet.