HDV uses MPEG-2 compression, a so-called LongGOP format. This means that each group of pictures is comprised of I, B, and P Frame. The I Frames are complete frames, while the B add P Frames reference redundancies in other frames to increase compression. Using MPEG-2 allows camera vendors to squeeze HDV video into the same data rate as DV, yet have a frame size containing roughly 4.5 times the pixel area. Up through HDV, most editors worked pretty similarly with all formats because the DV and HDV formats were simple streams of audio and video. Back in the DV days, life was simpler. Now you need to be conversant in LongGOP, MPEG-2, AVCHD, and AVC-I, and you must now the raster and display resolutions of all of the candidates to choose your HD format.
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