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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

Can there be multiple scene description streams in an MPEG-4 presentation?

Standard: 

Yes. For example, the BIFS scene may be composed from multiple sub-scenes that are Inlined to a main scene. In that case each sub-scene would have its own scene description stream