针对MPEG - 4的低质量和高质量两种编码质量的视频源，给出了一种混合模型，此模型在多个时间尺度上反映帧大小的变化：场景的变化和同一场景内码流的波动。

Based on the MPEG-4 video traffic of low quality and high quality, a hybrid model is presented to capture the frame size at multiple time scales: the change of scene and fluctuation of bit-rate.

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当模型的尺度很大时，两种方法都会遇到计算机资源不足所造成的困难。

When the model has a large scale, both types of the methods become difficult to be implemented because of the shortage of the computer storage.

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