I've just done some capturing over the weekend and I noticed using Premier that if the tape has any 'glitches' on it, then it can be enough to throw Premier off. It will stop capturing immediately and get you to save the file so far. It will also put up a screen saying that frames were dropped during capture. So even if you have a really powerful computer, a glitch or two on the tape in the camera can bring proceedings to a halt.

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All done without the aid of a safety net...