Is MPEG-4 complete and usable?
Yes. The first version of MPEG-4 was released in 1999 and can be implemented today. Since the initial release, amendments to the specification have been developed that add new functionality to the standard. These additions do not break the original specification, but instead enhance it. This means that a Simple profile encoder built in 1999 will still conform to the standard today. Other organizations such as the Wireless Multimedia Forum (see http://www.wmmforum.com/) are doing the same for the wireless industry.