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由于MPEG－2VBR视频码率变化剧烈，不利于信道带宽分配，因此，针对非交互式应用中视频传输延时可以大于帧周期这一情况，提出了一种基于给定传输时延下的VBR业务平滑算法，算法主要是根据MPEG－2视频I，P，B帧码字数的差异，调整各帧的传输时间，在确保阶传输延时的前提下，减小帧之间的信道接入码率变化次数，从而便于进行接人控制。
Due to the drastic change of the bit rate of MPEG-2 VBR video, which is unfavorable to the channel bandwidth allocation. Therefore, aiming at the situation that the video transmission delay in non-interactive applications can be larger than the frame period, a VBR service based on a given transmission delay Smoothing algorithms, the algorithm is mainly based on the MPEG-2 video I, P, B frame code word difference between the number of frames to adjust the transmission time to ensure that order transmission delay under the premise of reducing the channel between the access code rate Change the number of times, so as to facilitate access control.