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Hi. I would say NOT flash, if it's for members. Avi if they are really long, but mpeg is also not a bad choice. It depends on what compression you are going to use.
In terms of bandwidth, the best will be the smallest file size, of course. The video's should be at least 320x280 in dimension. (that is really small). The smaller the dimensions, the smaller the filesize. Surfers are not members, remember.
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