文章提出一种新的场景变换检测算法，进一步给出一种新的码率控制策略。
This proposes a new scene change detection algorithm, and also proposes a rate control scheme.
该算法只需要通过直接抽取MPEG视频流中的B帧、P帧中的宏块类型信息，并对其进行计算就可以检测出视频中存在的镜头边界，从而对场景变换进行精确定位。
The proposed method can detect scene boundaries through using various macroblock type of B-frame and P-frame in MPEG video flow in order to realize accurate scene change positioning.
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