[M4IF Technotes] Frame dropping policies

[Nikki Cranley]

Hi,
I was just wondering if there is a frame dropping policy.
If I have a VOP sequence with 30fps: 
I PBB PBB PBB I PBB PBB PBB I PBB PBB PBB
GOV = I PBB PBB PBB
And I want to reduce the frame rate to say 28fps.
Is there any frame dropping policy in place - such as 
2GOVs + I PBB PBB P
i.e. dropping the B frames first.
Then if I drop the frame rate to 27 fps
Should I have 
2GOVs + I PBB PBB  
or 
2GOVs + I PBB PB P
Is this application specific - are there any recommendations for such strategies? 
Rgds,
Nikki
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