Recording video between previously recorded video

HI,

this may sound little absurd, but what if i have a recoded clip in FMS , by the name of video1.flv (5 minutes long) and i want to insert more video in between video1.flv, i know the NetStream.publish() function could append video at the end of video1.flv, but i want to insert recording after 3 minutes, using NetStream.publish() or any other method. can some one suggest workable solution.