(Sorry for the inconvenience)
XBMC is a GPL licensed software media player and entertainment hub for digital media. XBMC can play most popular audio and video formats. It can play CDs and DVDs from a disk or image file and even files inside ZIP and RAR archives. It can scan all of your media and automatically create a personalized library with album covers, descriptions, and fanart.
During the installation of PC-BSD the installer provided an option to install XBMC. If you wish to install XBMC afterwards, use the System Packages tab of System Manager. You'll find XBMC under the Misc category of System Packages. Once MythTV is installed, an entry should be added to the Multimedia section of the application menu of your desktop.