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为了实现多媒体节目流在IP网上的实时播放,因特网工程任务组(IETF)为MPEG-2码流的分割及实时传输制定了相关的协议。根据此协议对MPEGVBR码流进行分割后,MPEG的三种类型帧的自相关结构都表现出短时相关性,因此,采用AR(2)模型对三种类型的帧的大小进行了模拟,并且与AR(1)模型进行了对比。结果表明,AR(2)比AR(1)模型能够更好地反映视频源的统计特性。
In order to realize the real-time playing of the multimedia program stream in the IP network, the Internet Engineering Task Force (IETF) has established the relevant protocols for the segmentation and real-time transmission of the MPEG-2 code stream. According to this protocol, the autocorrelation structures of the three types of MPEG frames exhibit the short-time correlation after the MPEGVBR stream is split. Therefore, the AR (2) model is used to simulate the size of the three types of frames, and Contrasted with the AR (1) model. The results show that the AR (2) model can better reflect the statistical characteristics of the video source than the AR (1) model.