H264VideoFramer的实现，能把h264 encoder输出的NAL单元打包成rtsp流，代码略作修改就可以跑,Implementation of H264VideoFramer, h264 encoder can output NAL unit package rtsp stream, to slightly amend the code can run

livemedia中并未提供关于h264 NAL单元的打包方法，而该文介绍了基于livemedia 的h264 NAL framer的具体实现-livemedia did not provide information on h264 NAL unit packing method, and the text livemedia based on the introduction of h264 NAL framer specific implementation