I'm also not sure that MythTV solves the problem here, since (as far as I know) MythTV doesn't do the digital decoding in any way? The newer TiVos can have a Cable Card put into them, but there's no Cable Card for computers.
I think this means that you can use MythTV in the same situation that you can use your analog DVR -- on the other side of a cable box (which is how TiVo usually works, historically) or with analog (no longer possible in Cambridge: Comcast switched to all Digital in July). I don't know if the Digital converter boxes that you can get rebates for do the digital from the Cable people? I guess that could be an answer for you -- just getting a digital converter box, and using that?
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I think this means that you can use MythTV in the same situation that you can use your analog DVR -- on the other side of a cable box (which is how TiVo usually works, historically) or with analog (no longer possible in Cambridge: Comcast switched to all Digital in July). I don't know if the Digital converter boxes that you can get rebates for do the digital from the Cable people? I guess that could be an answer for you -- just getting a digital converter box, and using that?