audiokonverter

http://www.kde-apps.org/content/show.php?content=12608

a service menu (and also a commandline utility) to easily convert from OGG, MP3, AAC, M4A, FLAC, WMA, RealAudio, Musepack, Wavpack, WAV and movies to MP3, OGG, M4A, WAV and FLAC in Konqueror