Speex is a voice optimized codec, that is it is very efficient at encoding speech, it should not be used for non-voice (ie music) encoding. Speex is Open Source and forms part of the Ogg Vorbis stable.
Created by Jean Marc Valin, specifically targeted for Voice over IP (VoIP) and audio books.
Download:
Created by Jean Marc Valin, specifically targeted for Voice over IP (VoIP) and audio books.
Download: