LoadingFLV

These are examples of sites loading FLV files at runtime

http://klaus.geekserver.net/flash/video.swf (plays a flv) - works with both the ffmpeg-backend and the gstreamer-backend
http://gnashdev.org/testvideos/scooter-flv.swf - (plays a flv) - works with both the ffmpeg-backend and the gstreamer-backend
Lulu TV - video site - works with both the ffmpeg-backend and the gstreamer-backend.
YouTube - video works with ffmpeg, and some report Gstreamer as well. Seems to not always start the movie unless a menu action occurs.