hi guys, don't know if anyone is still looking but i had the same problem, stuttering flv's even locally. I was loading the flv's into the flv component in cs3.
The ironic thing for me was these flvs were created in flash mx 2004 and all worked fine loading into the flv component in mx 2004, so i knew it was something to do with cs3 settings.
apparently the default buffertime in cs3 is 0.1 (why this should matter when the flv is fully loaded is beyond me)
i used the code below set the buffertime to 2
my_FLVPlybk.bufferTime = 2;
they all work perfectly (2 was good enough)
but heres the original link
http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp....
gavin