由于在AVSI-P2中采用了多种预测模式的帧间预测技术，但为了使编码器性能最优，需要对所有帧间候选模式进行遍历，以便从中选择最适合的模式，这无疑会大大增加编码器的计算复杂度。为了快速的进行帧间预测，根据AVSI—P2帧间预测模式的特点提出了一种快速的帧间预测模式选择算法，其特点是将基于全零块的提前中止准则与基于纹理特性的预测模式尺寸预选准则相融合来加快编码速度。实验结果表明，与AVS1-P2参考软件rm52h相比较，该方法在保持比特率和图像质量基本不变的同时，可显著减少编码器的计算复杂性。

AVS1-P2 introduces several prediction modes for inter coding. In order to achieve the best coding efficiency, the rate distortion optimization is exploited to choose the most suitable predicting mode, but it is very computationally expensive. In this paper, according to the characteristics of AVS1-P2 integer transform, we propose a new fast inter mode decision algorithm to improve the encoder speed based on two criterions, early termination based on all zero block detection and the prediction of inter-mode size using texture characteristic of macroblock. Compared with the reference code, simulation results show that this method will reduce the computing complexity of encoder and improve the encoding efficiency of AVS1-P2 software encoder while bit-rate and video quality almost remain unchanged.