$ 0 0 1. I帧(intraframe, key frame),P帧和B帧 http://blog.csdn.net/abcjennifer/article/details/6577934 http://www.cnblogs.com/lcchuguo/p/3998164.html https://zhidao.baidu.com/question/625164223485384364.html 2. H264(NAL简介与I帧判断) http://blog.csdn.net/jefry_xdz/article/details/8461343