Welcome to the ISO/IEC JTC 1/SC 29/WG 11 web site

also know as MPEG, the Moving Picture Experts Group.

The MPEG acronym is also used to indicate a suite of

ISO/IEC digital media standards developed by this JTC 1 Working Group.

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The Moving Picture Experts Group

What are MPEG-4 Systems 'profiles and levels'?

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Profiles are a mechanism to establish some well-defined subsets of the overall MPEG-4 functionality. Profiles are defined in multiple dimensions. In the context of MPEG-4 Systems Scene Graph Profiles and OD Profiles are distinguished.
While profiles establish a subset of MPEG-4 tools, levels put constraints on the parameters of these tools. Therefore the combination of profiles and levels help to determine the necessary processing power and memory requirements for an application.