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

Is the MPEG-4 scene description streamed?

Standard: 

Yes. There are elementary streams (just as any visual or audio stream) with BIFS commands and elementary streams conveying BIFS animation data. This allows to attach time stamps to such information, same as time stamps are attached, e.g., to an audio frame