A set of standards adopted by the moving pictures experts group for the compression of digital video and audio data or a file of data compressed according to those standards WordNet 3.0 & Open English WordNet

The Moving Picture Experts Group is an alliance of working groups established jointly by ISO and IEC that sets standards for media coding, including compression coding of audio, video, graphics, and genomic data; and transmission and file formats for various applications. Wikipedia

Working group of experts Wikidata

Any of a group of computer file formats for the compression and storage of digital video and audio data. Wiktionary