[M4IF Technotes] SP L3 bandwidth and VOP ordering questions

[Peter Haighton]

Hello Olivier,
If the encoder goes over the limit, then you are correct, you are no
longer compliant to MPEG-4. There is no telling what will happen to other
decoders since that is an implementation issue. Some decoders may be able
to handle, it others might decide to drop the stream. It is undetermined.
If an encoder only produces I frames, then yes you are compliant if you
stay with in the constraints put forth in the specification (ie bandwidth,
buffers etc). There is nothing in the specification that says you must use
each and every tool in the encoder. However, a decoder must be able to
decode every tool needed for a specific profile. Of course, if an encoder
only uses I frames, then there will not be many encoded frames per second
in the simple profile.
Peter
--
Peter Haighton
VideoSpheres Inc.
84 Hines Road
Kanata, Ontario
Canada, K2K 3G3
Tel: (613) 270-9646 x3022
Fax: (613) 271-9442
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 Olivier Schaer
Sent: Friday, October 26, 2023 2:47 PM
To: technotes   lists.m4if.org
Subject: [M4IF Technotes] SP L3 bandwidth and VOP ordering questions
Sorry for the basic question but I try to clarify my mind..
the bandwidth limitation for Simple Profile L3 is set to 384 kbits/s; my
question is :
what happens if we decide to go over this limit and ask our encoder for a
video stream exceeding this limit and we still claim to be SP L3? I guess
we enter a "no man's
land" and of course are not MPEG-4 compliant anymore... only our own
decoder is going to be able to decode this stream. What happens to the
other (compliant)
decoders?
I have been told we are not MPEG-4 compliant if we (the encoder) stream
I-VOP only. Is that true? I read in the spec. the VOP reodering is very
flexible, and am not able
to get hold on the section describing this requirment.
Thanks in advance
Olivier
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