When creating H.264 Flash video* for displaying in browser using player like JW FLV Media Player ( http://www.longtailvideo.com/players/jw-flv-player/ ), the MOOV atom need to be at the beginning of the file, not the end. Otherwise, the whole MPEG-4 file need to be downloaded before start playing, instead of starts immediately with http pseudo streaming.
export the MP4 file that way.
However
do not.
If the file is small (like < 1GB, otherwise you may get #1000 & 2029 errors), you can use utility like QT Index Swapper ( http://renaun.com/blog/2007/08/22/234/ ) to fix it.
* for "Moviestar" Flash 9 update 3 (v 9.0.115.0) 2007/12/03 or above.
** 1920x1080 Level 4.2 MPEG-4 from AME does not play correctly in Playstation 3 also. The dreadful 80028801 error.
AME CS3
CVS Pro X2
QT Index Swapper