I recently found the Wimpy FLV player and downloaded it for Mac OSX.  I played my FLVs with no problem and all I needed to do was unpack it

I have a copy of VLC player which should play the FLVs, but it hasn’t been doing the trick   I’m probably just missing some codecs, but Wimpy FLV player was a bit easier to set-up.

http://www.wimpyplayer.com/products/wimpy_standalone_flv_player.html