Dirac vs. Theora

There are. You can use gstreamer, with the plugins from the schrodinger implementation, or the ffmpeg2dirac transcode application to put Dirac video in an Ogg container. The oggz tools suite also has support for splitting and remuxing Ogg Dirac streams. See diracvideo.org for pointers.

Theora and Dirac will coexist for some time. Theora requires fewer computational resources than Dirac, so it's more appropriate for lightweight devices. Theora does better at low bitrates and is a better choice for streaming and web-embedded video, while most of the effort with Dirac has focussed on high bitrate encoding, visually indistinguishable from the original--or even lossless--and is a better choice for production intermediates and high quality distribution. Theora has also been around a lot longer. It's a more mature format, with a bitstream frozen in 2004. Dirac's Ogg mapping was last revised something like six months ago.

So while Dirac will offer better compression in the long run, there are reasons to use each format today, and tomorrow. Neither is a replacement for the other.