Some notes on setting up MythTV
Adding channels from a pre-scanned channels.conf prevents reading of EIT data collection. (http://code.mythtv.org/trac/ticket/7701)
It’s very easy to make your master backend think it is a slave. (http://spyder.wordpress.com/2008/06/11/a-crash-course-in-mythtv-backend-setup/)
If you want UPNP devices to be able to play video from your setup, you must give it a real IP address. But see the previous link to ensure you don’t confuse it.