How to guarantee the smooth transmission of video streams over IP network has been a hotspot at the area of multimedia communications.The traditional PCR-assist CBR schemes employ the timing information provided by the Program Clock Reference(PCR) embedded in the video streams to regulate their transmission

which reduce the buffer requirement at the cost of higher transmission rate when playing low-rate video streams.For the robust transmission of video streams with high rates

a novel transmission method is presented in this paper.It uses more detailed time scale and self-adapting buffer mechanism at the server side to smooth the rate variation further.Simulation results show that this method serves best for the transmission and playback by slowing down the transmission rate without higher buffer requirement.