Bankim - when Stephen referred to 720P50 he was referring to the HD200/250 line which records more FPS in HD than the 100 series.
Robert - you can conform 30P to 25P in two ways. You can either slo-mo the footage which woud be roughly 20% (ie treat it as 25FPS video) which is a popular thing with music videos to overcrank slightly. Or you can use frame blending to conform the video to 25fps - this would be render intensive and would mean that each frame in the 25FPS stream is not a true frame, as you have to squeeze six frames into a five frame sequence. There are probably other methods like pulling down certain frames but I'm not sure.
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