ActionScript 3.0 :: Preload .f4v FLVPlayBack Choppy?

Dec 18, 2009

I'm new here. My first post Just for info , I use Flex to build Action script project.
 
So I preload some f4v movie, <1,50 mo , 720*405, between 4 and 10 s duration.
 
No problem for the preload. But when 'bytesloaded=bytestotal' ,  I play the file, it looks like choppy. The video is not smooth at all.
 
I try with flash player beta 10.1 , it's better but still choppy. Anyone get this problem ?  I try to play with the buffertime method of F4vPlayBack , it changes nothing.

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