Secondly, macroblock layer rate control strategy is used to distribute target bits.

然后，采用宏块层码率控制策略来分配目标比特；

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At the same time, this paper also improves the process of RDO in the macroblock layer. Based on the prediction bits of the macroblock, the Lagrange coefficient has been modified adaptively.

同时，论文提出的码率控制算法还对宏块层的率失真优化过程做了改进，根据每个宏块的预测目标比特数来调整率失真优化的拉格朗日系数，使帧层码率控制效果更优。

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The QP (Quantization Parameter) of each macroblock is calculated in macroblock-layer, the target bits of each frame is allocated in frame-layer.

帧层次主要计算为这一帧分配的目标字节数，宏块层次主要计算每一个宏块的量化参数。

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