MP4v2 so，build for android， create and modify mp4 files as defined by ISO-IEC:14496-1:2001 MPEG-4 Systems. It is a very powerful and extensible format that can accommodate practically any type of media.was originally bundled with mpeg4ip library, but has been moved into its own maintained library due to a combination of the cessation of support of mpeg4ip and the usefulness of this library on its own.