mp4 The MP4 file format and the .mp4 filename extension refer to the MPEG-4 part 14 digital multimedia format developed by the Moving Picture Experts Group. It is used as a multimedia container to wrap encoded digital video and audio streams, including subtitles and still images if required. In recent decades, the format has been popularized as one of the main standards for streaming media over the internet and other computer networks and for the digital distribution of large multimedia files. MP4 supports a large number of compression audio codecs allowing files in this format to maintain a relatively small size without discounting playback quality.
mpeg Being the most broadly compatible audio and video container format from the lossy class of containers, the MPEG standards are supported by numerous audio and video products and software applications. The standards were designed to meet the growing need for digital storage of audio and video media. They both utilize a lossy compression to scale down VHS quality digital video and CD audio. The two formats, mpeg-1 and mpeg-2, are the result of the combined efforts of the moving picture experts group which was established in 1988. The mpeg-1 has its beginnings in the same year, with an initial release to public in 1993.