OggConvert is a small GNOME utility that uses GStreamer
to convert media files to the patent-free Theora
and Vorbis formats. It also supports the Dirac format,
through the schrodinger codec. It's painfully easy to use,
changing the quality settings and the output
filename is simple. It uses GStreamer, so it can
convert (almost) any file which Totem can play.
It can deal with audio-only files, video-only files,
and files with many audio tracks (such as DVD rips with
a commentary track). Thanks to the magic of GStreamer, metadata
(for example, title and artist info on an MP3) is preserved.
Finally, it adheres to the GNOME HIG as much as possible.