The MPEG-4 requirements [N4319] have been addressed by a standard organized in several Parts, each one with multiple editions, amendments, and corrigenda. Amendments to each Part of the standard were also called Versions (the first edition itself is Version 1). The list of documents issued as of July 2001 for the various Parts of the MPEG-4 standard is as follows:
 Amendments to the second editions were sometimes called extensions.
Part 1: Systems. This Part specifies scene description, multiplexing, synchronization, buffer management, and management and protection of intellectual property [MPEG4-1].
Version 1: First edition (14496-1:1999)
Version 2 (first amendment to first edition): Systems extensions (MPEG-4 ...