For the lack of rate control model in H.264

a new macro-block layer rate control algorithm for H.264 is proposed. The algorithm uses the spatio-temporal relevancy of frames estimated mean absolute difference(MAD).Then a fuzzy controller is applied

making rate control no longer rely on the various statistical models. By leaving out the updated of the model parameter

the computational complexity of the algorithm is decreased to some extent. The experimental results show that compared to JM8.6 original algorithm

the new algorithm can increase the accuracy of rate control and the image quality of the restoration at the same time.