.MP4V File Extension

Video file format developed by MPEG (the Moving Picture Experts Group); may contain still images, video objects, and audio objects; also supports text, graphics, and synthetic sounds.

MPEG-4 is designed for three primary mediums including 1) digital television, 2) interactive graphics applications, and 3) interactive multimedia (i.e. the WWW). It is based on the MPEG-1 and MPEG-2 standards, but supports additional types of content and is more extensible.

The standard file extension for MPEG-4 video files is .MP4.