Synchronization-predictive(SP) frame,which enables high efficiency of switching between two bitstreams with different qualities,is supported by H.264/AVC.And fine-granular-scalability(FGS) video coding is supported by MPEG-4.The combination of the two tools was proposesed to adapt high bandwidth variations of internet or wireless networks and low bandwidth variations flexibly.The experimental results show that the proposed system outperforms FGS by 0.47 dB and the H.264/AVC-based stream switching(SS) approach by 0.23 dB on average.