[Mp4-tech] TopField and BottomField in Baseline proffile and POC

[atul tomar]

Hi,
As we know that we dont use interlacing in baseline proffile so Is it necessary to determine PictureOrderCount. I knew through standard that it is also used for decoder conformance checking but how Can we get TopField and BottomField field related variables if we are not dividing frame in fields then how can we work with above two variable while determing POC. 
As per my understanding, Is it correct if we consider only TopField variable thinking like a frame.
Please give your inputs considering me as a newbie in this field.
Many thanks in advance.
Regards,
Atul
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