What is a 'VOP' in MPEG-4 (RTP)?

I am reading through the MPEG-4 RTP Packet RFC (http://www.rfc-editor.org/rfc/rfc3016.txt) and finding very often the word

VOP

I have not found any definition in the net or RFC, does anyone can tell me what this VOP is?

Solution

In terms of video codecs, VO is usually video object and VOP is video object plane.

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