subject: How to rip DVD to MP4 on Mac? [print this page] MP4 refers to MPEG-4 Part 14 or *.mp4, is a file format (also called container) specified as a part of the ISO/IEC MPEG-4 international standard. It is used to store media types defined by the ISO/IEC Moving Picture Experts Group, and can be used to store other media types as well. Generally speaking, MP4 is most commonly used to store digital audio and digital video streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images.