can't you just take the cable output from the sattelite reciever and instead of going to the input of the TV go to the input of your tuner card and capture shows that way?
That is how I do it. The downside is that my capture card can't change the channel on my DirecTV receiver. So I kind of have to be there to manually start my recordings.
The DirecTV/Tivo box is great for unattended recordings (dual tuner). But, if I want to keep something permanently, it's a two-step process. First record the show with Tivo, then record (capture) it again with my analog capture card. If I could somehow grab the video files directly from Tivo, I wouldn't need to perform an analog capture an a file that is already in digital format.
I used to be indecisive, but now I'm not so sure...