Flash as3 video chat

I am using flash as3 and red5 to record a live chat.I recorded live chat as two flvs they are user0.flv and user1.flv
i started the second video to play in exact position.But while playing that recorded videos. it’s playing unsync due to streaming.Because Both videos streaming separately. how to solve this.

Any possibilities to sync this two videos streaming and playing

Thanks in Advance
Sankar