It's been my experience that both graphics and videos put
into the player will appear to get smaller. From what I can tell,
they're being resampled to a size that's convenient for the player.
When I import .swf, I get it at 640x480. Strangely, I then
have to shrink the video until the video player box has no white
space around the video. When I then view the presentation, the
video might be much smaller than, or a bit larger than 640x480,
depending on how large the presenter player is...