how about an alternative to capturing on the xbox itself... everyone knows you dont want your shiny multifunction xbox stuck using linux at all times cuz you have a show scheduled to record in *looks down at watch* 20 minutes so 'uhh i cant use my xbox rigth now..'
and again, the quality of video due to the xbox's internal components and mainly the use of usb1.1 make most people not want to waste time on this idea...
however... ive found a better way that should work without a hitch... still using linux running on xbox, however, alot more like how media player/center handles getting video..
www.snapstream.com, basically the software runs on a pc with a tv tuner in it, it uses xml to create the tv guide, and encodes like a norenal pc with a tv tuner would with very nice scheduling features, the only difference and the reason this will work, is because that software and the pc acts effectively as a pvr server... you can run client software on the xbox in linux, or on any other pc on your network, which show the current tv guide for live tv over ethernet, as well as picking what you want the pc to record later on! select what you want recorded, and let the pc do the work... at that point you can also switch to already recorded menu (or use xbmp/c) and playback the stream through your network... very good solution to this 'want', give it a shot and lemme know how it goes for you...