Flash player version for recorded stream playback

I'm having difficulty to determine which flash player version is required by users when playing FLV files using the video object in flash (so no fancy FLV playback components). I've read that thare ar basically 2 codec for FLV files, Sorenson an On2, and that Sorenson is supported from Flash player 6 and upwards and On2 from Flash player 8 and upwards, but what codec is used when just playing flv files that were recorded by Flash Media Server and playing is in a "simple" video object.? Or can i just use the publishing settings and set it to player 6 and thats it? (To be absolutely clear: I am not encoding the flv files with an encoder, i just play back the flv streams recorded by Flash Media Server itself)