最新的iso base media file format,是ISO/IEC 14496-12:2008 的描述 MPEG-4部分,可以参考这个文档了解MP4文件及MP4 Fragment文件。-The latest the iso base media file format, the ISO/IEC 14496-12:2008 s descr iption of MPEG-4 part, can refer to the documentation for MP4 files and MP4