Only thing I could reccomend is to try and keep cpu usage low whilst exporting (ie. closing ram-sucking programs like Photoshop or keeping browsers off of Youtube.)
You could try asking <a href="<a href="http://mrsimon.newgrounds.com">http://mrsimon.newgrounds.com</a>">MrSimon</a>. He managed to turn one of my movieclip infested swfs into a decent video using some sort of program.
Oney
I don't know