"OggConvert is a simple, GUI-based video transcoder that outputs
only to the free Theora and Dirac formats. It couldn't be any
easier to use, and it's the quickest way to get a feel for the
still-new Dirac codec. No need to tweak pages of arcane
settings--just drag, drop, and watch.
"You can download OggConvert as source code, or as a prepackaged
binary for Debian, Fedora, SUSE, or Ubuntu. The latest release is
version 0.3. OggConvert is written in Python, and uses GStreamer to
perform its media conversion work..."