MPEG-2 Video GOP Structure

If GOP structure is group of pictures behind a gop video header in side elementary header.

A GOP contains I frame, P frames, and B frames.

It follows a pattern. For example:

1.   GOP = 10 and b frame =2
        Encoding sequence: "I P B B P B B P B B"
        Display sequence: " I B B P B B P B B P "
 

2.   GOP = 30 and b frame =3
        Encoding sequence: " I  P B B B P B B B P B B B P B B B P B B B P B B B P B B B P  "
        Display sequence: " I B B B P B B B P B B B P B B B P B B B P B B B P B B B P P  "