Live Video Output to TV

I'm looking for a solution to a multimedia problem. I'm doing a show for the stage that requires video clips (currently in DV format) to be played at certain points during the show. Since it is live, the length between the clips is variable night to night (during those times I'd like to have just a graphic). I'd like to control it via a PowerBook G4. I would consider using either the firewire > video camera> TV solution, or the DVI > TV solution, which ever is easier. Can i use any existing software that I might have to make this sort of "Video Slideshow"?? Any help would be appretiated!!
PowerMac G4 Mac OS X (10.4.6)

I use a dc30 personally, brilliant old card.
I reckon it may be a diveo format problem. play the QT video in Quicktime. does it play back on the TV? if it does then it should play back in logic no problem. if it doesn't, then you might need to convert the video to dv streaming (which is different to dv which final cut pro uses). i am no expert in this area, but until somebody more knowledgable posts then i would say QT format issue is your problem.

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