First, where are you playing the file, what player?
i am clicking on the flv file and playing it that way. as was as loading it into an elearning program called Articulate. Articulate place in the flash player. i am using flash player 9
Which player is set as the default for FLV file types?
I have seen similar issues with VLC Player (normally a great software player), but when played in Adobe Flash, or MediaPlayer Classic HC, they played just fine. That is why I was asking about the player program used.
Also, when you run one of the FLV's through MediaInfo, what are the details of the Audio Stream?