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HDV uses interframe compression and has a fixed bit rate of 25Mbps. Color sampling is 4:2:0.
DVCProHD doesn't use interframe compression and has a fixed bit rate of 100Mbps. Color sampling is 4:2:2.
The question (to me) is: what are you trying to do? e.g., traditional event videography vs. scientific/technical video analysis etc.
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