[Mp4-tech] Do the motion estimation happens only after thecalculation of PMV ?

[Andrew Krupiczka]

Hungary,
As motion estimation is concerned you're free to do whatever you want.
Majority of motion estimation algorithms implemented in software used
for MPEG-based video encoding take advantage of high correlation between
motion vectors of neighboring macroblocks thus why you may want to
establish a starting point/center of your searching process using a few
MV candidates from previously encoded neighboring macroblocks. Under
normal circumstances such approach is expected to deliver a healthy
trade-off between quality of encoded video and computational complexity.
Let me encourage you to study some widely available literature on that
subject and primarily a papers by Alexis Tourapis, who greatly
contributed to that area
(http://www.softlab.ece.ntua.gr/~tourapis/public.htm) and later some
publicly available JVT documents (F017r1, G013, P021, P026r1).
Best regards,
Andrew
PS. It's also worthy mentioning that there are other ME algorithms
working effectively which don't use a concept of MV prediction (e.g.
based on a phase correlation), so then you could perform entire ME in
advance before any video inter-frame encoding actually starts.
-----Original Message-----
From: hungary [mailto:mykerekes eml.cc] 
Sent: Wednesday, December 21, 2023 6:53 AM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] Do the motion estimation happens only after
thecalculation of PMV ?
Hai Experts,
In case motion estimation we come across PMV(Predicted motion vector ).
Which decides the search point form where actual motion estimation algo
starts.
Do the motion estimation happens only after the calculation of PMV ?
or we can do the same independently without doing PMV calculation ?
If so which is the origin point from where we need to start for search?
Regards
--MK
-- 
  hungary
  mykerekes eml.cc
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