Bit rates targeted for the MPEG-4 video standard are between 5-64 kbits/s for mobile or PSTN video applications and up to 2 Mbits/s for TV/film applications. Seven new (with respect to existing or emerging standards) key video coding functionalities have been defined which support the MPEG-4 focus and which provide the main requirements for the work in the MPEG video group. The requirements cover the main topics related to "Content-Based Interactivity?, "Compression? and "Universal Access?.
http://wwwam.hhi.de/mpeg-video/standards/mpeg-4.htm
