通过研究H.264/AVC帧间编码中最佳模式分布，提出了3种模式选择早期终止策略，分别对SKIP，P16×16，P16×8和P8×16这3类模式成为最佳编码模式进行判断，适当地结束编码模式选择过程，避免了对后面不可能模式率失真代价的计算，从而减少了帧间编码的计算复杂度。实验结果表明，该算法可以减少H.264/AVC编码器50％～70％的编码时间，同时保持与全搜索算法基本一致的编码性能，峰值信噪比PSNR平均下降0.17 dB左右，编码比特率平均增加2.42％。

According to the distribution of the best inter coding modes, we give three early-terminated strategies for deciding whether one of the SKIP, P16×16, P16×8 or P8×16 can be selected as the best inter coding mode. If the conditions can be satisfied, the computation of RD cost of the rest mode can be saved. Experimental results show that the proposed algorithm can save about 50% to 70% time compared with a full-searching algorithm in H.264/AVC, meanwhile the decreasing of PSNR is about 0.17dB and the increas of bit-rate is about 2.42%.