If you have Flash 8 Professional, you have the Flash 8 encoder which can convert just about any file to the flv format. As far as I remember, if you can output from AE to flv that means you must have installed 8Pro. I’ve always used Flash 8 Pro and AE 6.5.
Either way, I always render out an uncompressed or mpeg4 quicktime video from AE and then use the Flash 8 encoder that comes with 8 Pro to convert to flv. I set my cue points in the encoder as well.
However, you can also import the video into Flash 8 and it will encode it to flv for you.
Visit http://www.gotoandlearn.com and watch the first two tutorials on using video and you’ll find one way.
You can also just go (within Flash 8) File – Import – Import Video follow the steps and you’ll have video.
But, as mentioned above, you’ll need to put these into a movie clip or video component to be able to play them via events and control via actionscript. Otherwise, they just play