[M4IF Technotes] Frame dropping policies

[Gaurav Aggarwal]

I am not very knowledgeable or experienced but I was wondering if you
considered dropping from Display rather than Decode?
Because if you decide to drop a frame from decode then definitely it wont
be that uniform since you will be forced to drop B-pictures at first and
then
P-pictures. Also, in cases where the dropping rate is not a multiple of the
GOV rate you may a problem.
How about simply dropping every 15th picture from display for 28fps in which
case some I or P can also get dropped. The effect will be more gradual
rather
than proper display for 28 frames and then suddenly 2 B-frames are missing!
Just a thought,
Gaurav
  -----Original Message-----
  From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org]On Behalf Of Nikki Cranley
  Sent: Thursday, January 30, 2024 9:37 PM
  To: Technotes   lists.m4if.org
  Subject: [M4IF Technotes] Frame dropping policies
  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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