[M4IF Technotes] OBMC, for which visual profile

[Peter Haighton]

Hi Gary,
Actually, I agree, I just thought that I would raise the question as food
for thought. I am constantly having to correct people (magazines) because of
confusion with MPEG-4, and this is just something that adds more confusion
on top.
Peter
-----Original Message-----
From: Gary Sullivan [mailto:garysull   microsoft.com]
Sent: Tuesday, July 10, 2023 3:26 PM
To: Peter Haighton; axel.binder   philips.com; technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] OBMC, for which visual profile
Personally, I don't think we should try to remove OBMC from MPEG-4.
It takes a lot of work to remove things, and it's possible
to introduce errors in the process.  And the position of OBMC
in the spec isn't really a problem -- it's just an oddity.
It's just an opportunity that was passed by -- a useful tool
that hasn't yet been used (at least not in MPEG-4).  I believe
there have been other examples of such things, although I can't
think of others in MPEG standards at the moment.
There's always the chance it could get picked up in some
yet-to-be-defined future profile.
Best Regards,
-Gary
-----Original Message-----
From: Peter Haighton [mailto:peterh   videospheres.com]
Sent: Tuesday, July 10, 2023 12:04 PM
To: Gary Sullivan; axel.binder   philips.com; technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] OBMC, for which visual profile
Hi All,
Yes, OBMC is a strange thing.  Since it is described quite well in the
standard, it is kind of odd that it never got put into any profile. Its
a
tool with no home! Which leads to the question, should it be removed
from
the specification?
Peter
--
Peter Haighton
VideoSpheres Inc.
329 March Road, Unit 109
Kanata, Ontario
Canada, K2K 2E9
Tel: (613) 270-9646 x240
Fax: (613) 271-1896
email: peterh   VideoSpheres.com
See http://www.m4if.org for the latest on MPEG-4
-----Original Message-----
From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org]On Behalf Of Gary Sullivan
Sent: Tuesday, July 10, 2023 2:30 PM
To: axel.binder   philips.com; technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] OBMC, for which visual profile
Axel,
You're right.  None of the MPEG-4 profiles use OBMC.
That's unfortunate, because it's a good tool (although
my opinion is biased).
It's odd that some publications talk about OBMC as
being a feature of MPEG-4.  As things stand, it really
isn't used in that standard.
Best Regards,
-Gary S.
-----Original Message-----
From: axel.binder   philips.com [mailto:axel.binder   philips.com]
Sent: Tuesday, July 10, 2023 8:24 AM
To: technotes   lists.m4if.org
Subject: [M4IF Technotes] OBMC, for which visual profile
Hi,
can anybody tell me for which visual profiles the
"overlapped motion compensation"-tool (OBMC) is employed?
Due to the profile overview in the standard it's never
used. In some requirement document I found it was proposed for
Main profile.
thanks beforehand
axel
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Axel Binder                     Philips Starnberg
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                                D-82319 Starnberg
phone:  +49 8151 270 108        Germany
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