Creating Ogg audio files on Linux You can try using oggasm to convert mp3 to ogg vorbis. You can also try a modified version of same software with some enhancements.

One can also try oggenc which is supplied with vorbis-tools to convert raw wav files to wav.
oggenc input.wav

To rip audio on CD to ogg files, you can first rip it to wav files using CD Paranoia and then use oggenc to convert wav to ogg. Korbis provides a KDE based frontend for same.

Note: Converting files from mp3 to ogg is not recommended. This is becase, both mp3 and ogg vorbis are lossy formats and changing from one lossy format to other will result in degradation in quality.

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