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There are basically two kinds of capture cards - frame capture and hardware mpeg. Hardware mpeg is much better. Once you buy one, add some free software like Mythbuntu and you have a kickass DVR. For the frame capture cards, the hardware basically takes screenshots and the software turns the screenshots into an mpeg. The hardware mpeg cards send mpeg directly over the USB or PCIe - no screenshots.
When buying a capture card, one that includes a tuner (with a coax jack) will be much better for future uses, like as a DVR.
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