You've got me confused now. Lets see if I can figure out your progression here.
You've recorded something from tv. Did you do this on a stand alone recorder or did you capture straight to the hard drive of the computer?
DVDShrink only works with complete dvd-video structure, so however you captured it, the only way that Shrink can open it is if it is dvd-video.
Did you use DVDShrink to compress the video? Or did you use it simply to make an ISO file without compression?