针对比特率缩减的H.264视频转码问题，提出了一种混合型视频转码（mixture video transcode，MVT）方法。该方法首先采用串联结构对Intra帧进行编码转换，然后选择开环结构对Inter帧进行转换编码，同时在转换过程中，对Inter帧进行部分误差消除处理。这样，经过转换编码操作后，即可以得到无误差的Intra帧，而对于Inter帧，虽然开环结构转码后，图像质量损失大于串联结构方式，但由于在转码过程中进行了消除误差漂移的操作，因此这一损失被控制在可接受的最小范围之内。实验结果表明，该混合型视频转码方法在转码速度上远远高于串联结构，在转码后的图像质量上接近串联结构，并且远远好于开环结构。

In this paper we propose a mixture video transcoding method with limited drifting error for H.264 bit rate reduction transcoding.Casacaded pixel-domain architecture is selected to transcode an intra frame and open-loop architecture is selected to transcode the inter frame.At the same time，drift error compensation operation is implemented for the inter frame.Experimental results show that using this video transcoding architecture，the picture quality obtained from the proposed transcoder is close to that of the traditional cascade pixel-domain transcoder，while the transcoding speed is close to the open-loop architecture video transcoder.