[M4IF Technotes] H.26L video coding

[Kris Huber]

Hello Bis,
H.26L proponents responded to a recent call for proposals for advanced video
coding efficiency technologies and it did well in the evaluation.  I believe
it, or some of its features, may become new MPEG-4 video coding tools,
although this is by no means a certainty.  There's a general philosophy in
MPEG about having a single tool per functionality, and quite dramatic
improvement in some significant dimension must be demonstrated to create an
exception to that.
The ARTS and ACE profiles you mention are already defined, and it is
unprecedented for profiles to change their tool set after definition.  We
have one small exception so far, in the exclusion of the interlace tool in
one of the profiles (FGS, I think), at a level where the nominal vop rate is
only 15 fps.  But this exception is very sensible and deliberately made for
complexity reasons because interlace in the the source material is so easily
avoidable at low frame rates.  Normally any new tools only become part of
new profiles rather than being added as new levels to existing profiles.
Otherwise confusion is created about the tool set associated with a profile,
and the definition of profile as "tool set" is violated.
Regards,
Kris
-----Original Message-----
From: Biswajit Biswas [mailto:biswas   tataelxsi.co.in]
Sent: Monday, September 24, 2023 10:53 PM
To: technotes   lists.m4if.org
Subject: [M4IF Technotes] H.26L video coding
Hi all,
I was just evaluating H.26L(ITU-T) video encoding quality. I found, it
offers much superior quality at significantly low bit-rate.
It uses Context-based adaptive binary arithmetic coding (CABAC) technique
for entropy coding. Among many new things I am just mentioning a few,
it uses more than 1 previous frame for motion estimation, scalable
macro-block sizes (16X8, 4X8,  8X16 etc), five different prediction mode
for B -frames encoding, use of deblocking filter for encoder etc.
Is MPEG4 planning to adopt some of this techniques in the newer video
profiles like Advanced Real Time Streaming (ARTS) , Advanced Coding
Efficiency(ACE)?
regards
Bis
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