[Mp4-tech] H.264 frame rate

[ChenJianjun]

Dear experts:
How to calculate the H.264 frame rate? 
I noted that VUI parameter(SPEC E.1) and Picture timing SEI message semantics(SPEC D.2.2) may have such information.But they are optional,then how to get the frame rate information if there's no such information?
Thanks!
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