I have put a mythtv http://www.mythtv.org frontend channel together for Roku based on the videoplayer example from Roku.
it can be downloaded from here
git clone https://github.com/ear9mrn/MythRokuPlayer.git
or from here as a tarball
https://github.com/downloads/ear9mrn/My ... yer.tar.gz
private channel for your roku player:
follow the readme. You will need to copy a directory to your mythweb directory and set some server perameters. Hopefully the readme is self explanatory. https://github.com/ear9mrn/MythRokuPlayer/blob/master/README
Comment on this thread if you have any problems of suggestions.