Flash video imported from MOV stops midway

I imported an MOV video into Flash using “progressive download from web server”. Did not get any error message. But when I run the Flash, the video plays and then stops midway.

I did play the original MOV in QuickTime and it ran all the way through fine.

I have tried in both Flash 8 and CS3 and at “high” and “medium” quality. Same thing.

What could be wrong? And what are my suggested alternatives?