Please Note: 

For the big box banners the video needs to fill the complete area of 300*250 so for the best results I've been importing the Quicktime movies at 640*480 and scaling to 53% during the import process. This produces an embedded video object  with 339*254 dimensions.

Sample file - bigbox/test_ind.fla

All Quicktime movies have been exported at 18 frames/sec to match the flash movie.