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结合软件实现ＰＳＴＮ可视电话的实际应用，针对ＭＭＸ技术单指令多数据（ＳＩＭＤ）的特点，讨论了ＭＭＸ技术在视频编码的实时软件实现中的具体应用，分析了将ＭＭＸ技术同具体应用结合的途径，并以二维ＤＣＴ快速算法的ＭＭＸ优化为例，分析、比较了算法的ＭＭＸ技术优化前后的算法效率。
According to the characteristics of MMX SIMD, this paper discussed the application of MMX technology in real-time video coding and analyzed the practical application of MMX technology with specific application Way, and taking the MMX optimization of two-dimensional DCT fast algorithm as an example, the algorithm efficiency before and after optimization of the algorithm MMX technology is analyzed and compared.