OggConvert might have discontinued, try finding OggConvert alternatives
OggConvert is a free and open-source transcoder for digital audio and video files of various types into the free Ogg Vorbis audio format, and the Theora, VP8 and Dirac video formats.
Developed by Tristan Brindle
Apps available for
Mac OS X
OggConvert is an Open Source Product.
Tristan Brindle has developed OggConvert