This is a dupe from a post in one of the others pages of this project?! Why is it there are 3 pages for the flv streaming plugin at Sourceforge? No matter... Just didn't know which page was the correct one...
There's this one implementation of FLV4 that works. It's in a custom build of TCPMP (it's flv1 fullscreen with Intel XScale doesn't work properly... must use your flvffmpeg.plg?...