一个解析MP4文件提取其相关信息的小工具，来自DarwinStreamingServer5.5.5，具有多种功能，比如能提取sdp信息，查看track信息，打印指定的原子信息，生成RTP文件，等等。-a concise and convenient kit to parse the MP4 media file,such as show the sdp info,track info, some atoms info, and the source code is extracted from