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

Question

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?

Answer 1

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