[M4IF Technotes] How can I figure out how many vops in a group_of_vop?

[Li Zhengming]

Dear all,
I want  to know how can I decide how many vops a group of vop contains. If there is several gov header in a stream, then the number of vops in a gov can be decided by counting the vops between two gov headers. But if there is only one gov header in a stream, does this mean that all the vops following the gov header are in the gov?
If a gov header exists, all the vops in it have the time base of this header as their time reference. Do I understand right?
Thank you very much!
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