É, converti todos os meus cds para OGG, alguns ganhei qualidade, outros ficaram na mesma, o tamanho varia hehee, mais é muito bom
O Ogg-vorbis tem melhor qualidade que o MP3.
Lassard, eu achei um FAQ da própria Vorbis, onde eles afirmam que você não deve fazer conversões de MP3 para Ogg-vorbis:
"Can I convert my MP3 collection to the Ogg Vorbis format?
You can convert any audio format to Ogg Vorbis. However, converting from one lossy format, like MP3, to another lossy format, like Vorbis, is generally a bad idea. Both MP3 and Vorbis encoders achieve high compression ratios by throwing away parts of the audio waveform that you probably won't hear. However, the MP3 and Vorbis codecs are very different, so they each will throw away different parts of the audio, although there certainly is some overlap. Converting a MP3 to Vorbis involves decoding the MP3 file back to an uncompressed format, like WAV, and recompressing it using the Ogg Vorbis encoder. The decoded MP3 will be missing the parts of the original audio that the MP3 encoder chose to discard. The Ogg Vorbis encoder will then discard other audio components when it compresses the data. At best, the result will be an Ogg file that sounds the same as your original MP3, but it is most likely that the resulting file will sound worse than your original MP3. In no case will you get a file that sounds better than the original MP3.
Since many music players can play both MP3 and Ogg files, there is no reason that you should have to switch all of your files to one format or the other. If you like Ogg Vorbis, then we would encourage you to use it when you encode from original, lossless audio sources (like CDs). When encoding from originals, you will find that you can make Ogg files that are smaller or of better quality (or both) than your MP3s.
(If you must absolutely must convert from MP3 to Ogg, there are several conversion scripts available on Freshmeat .)"
http://www.vorbis.com/faq/Além disso já tinha lido no Fórum do Ubuntu Gringo que este tipo de comversão Ogg - MP3 ou vice-versa, deve ser evitado por causa das perdas , fica muito ruim.
Então você tem que escolher mesmo na hora de ripar o CD qual formato escolher.
Abraços.