[M4IF Technotes] Profile@Level Visual Image size

[Peter Haighton]

Arcin,
Level 0 came out as part of amendment 4.  I do not know if ISO has
published it yet though, I don't think so.  MPEG-4 Simple Profile Level 0
has the following restrictions:
a)	The maximum frame rate shall be 15 frames per second;
b)	The maximum f_code shall be 1;
c)	The intra_dc_vlc_threshold shall be 0;
d)	The maximum horizontal luminance pixel resolution shall be 176
pels/line;
e)	The maximum vertical luminance pixel resolution shall be 144 pels/VOP;
f)	If AC prediction is used, the following restriction applies : QP value
shall not be changed within a VOP (or within a video packet if video
packets are used in a VOP). If AC prediction is not used, there are no
restrictions to changing QP value.
Other than Level 0, Simple Profile does not specify maximum frame size. It
does specify buffer sizes which would for example not let you do CIF in
Level 1.
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 Arcin Bozkurt -
Archie
Sent: Friday, August 17, 2023 9:37 AM
To: technotes   lists.m4if.org
Subject: Re: [M4IF Technotes] Profile   Level Visual Image size
I may be missing something here.
I have the MPEG-4 standard, but I haven't seen any Level 0 description.
Where can I get this information?
I was trying to understand whether the size either in x or y dimension
was restricted to any value (as in the example you gave for SP   L0)
Peter's example mentions an image of size 352x72 which is larger than a
QCIF for SP   L1, but the max MB of 99 restriction is met.
Arcin
 >>>>>>>
Dear Arcin,
you were not mentioning Simple Profile @ Level 0 which explicitly
restricts
the image size to Width <= 176 pel and Height <= 144 pel. This P   L
combination is used e.g for 3GPP mobile terminals.
Best regards,
Andreas
----------------------------------------------------------------------
Dr.-Ing. Andreas Hutter
Siemens AG, Corporate Technology
CT IC 2                                       phone: +49 89 636-50417
Otto-Hahn-Ring 6                                fax: +49 89 636-51115
81730 Munich, Germany	        email: Andreas.Hutter   mchp.siemens.de
---------------------------------------------------------------------
Peter Haighton wrote:
>Hello Arcin,
>
>The typical value means that this is what most implementations would
>probably use SP   L1 for, but you can use other strange and wonderful video
>shapes if desired.  For example 352x72 but I don't of an application that
>would.
>
>So basically in real world scenarios you are correct that SP   L1 would be
>used for sizes up to QCIF.
>
>Peter
>
>-----Original Message-----
>From: technotes-admin   lists.m4if.org
>[mailto:technotes-admin   lists.m4if.org]On Behalf Of Arcin Bozkurt -
>Archie
>Sent: Friday, August 17, 2023 8:00 AM
>To: technotes   lists.m4if.org
>Subject: [M4IF Technotes] Profile   Level Visual Image size
>
>
>
>MPEG-4 is able to handle any size image with the information taken from
>video_object_layer_width and
>video_object_layer_height.
>
>
>Does Simple Profile @L1 or L2 or L3 bring any restrictions to this?
>
>Annex N.1 (definition of Visual Profiles   Levels), specifies a "typical"
>size which is for example QCIF for  Simple Profile @ L1. Does this mean
>that SP   L1 support image sized UP TO QCIF??  This is in line with the
>MAXimum 99 MB per VOP restriction of SP   L1.
>
>Can you please clarify this issue?
>
>Arcin Bozkurt
>Lumic Electronics Inc.
>
>--------------------------IMPORTANT NOTICE------------------------------
>This message is intended only for the use of the individual
>or entity to which it is addressed, and may contain information
>that is privileged, confidential and exempt from disclosure under
>applicable law. If the reader of this message is not the
>intended, or the employee or agent responsible for delivering
>the message to the intended recipient, you are hereby notified
>that any dissemination, distribution or copying of this
>communication is strictly prohibited. If you have received this
>communication in error, please notify Lumic Electronics immediately.
>Thank you.
>--------------------------IMPORTANT NOTICE------------------------------
>
>----------------------------AVIS IMPORTANT----------------------------
>Le présent message n'est destiné qu'à la personne ou à l'entité
>à qui il est adressé, et peut contenir des renseignements de
>nature privilégiée et confidentielle qui ne doivent pas être
>divulgués en vertu des lois applicables. Si le lecteur du présent
>message n'est pas le destinataire prévu ou encore l'employé
>ou le mandataire chargé de remettre ce message au destinataire
>prévu, vous êtes par les présentes avisé que toute diffusion,
>distribution ou reproduction de cette communication est
>strictement interdite. Si vous avez reçu cette communication par
>erreur, veuillez en aviser Lumic Electronics immédiatement.  Merci.
>---------------------------- AVIS IMPORTANT ----------------------------
>
>
>
>
>
>_______________________________________________
>Technotes mailing list
>Technotes   lists.m4if.org
>http://lists.m4if.org/mailman/listinfo/technotes
>
>_______________________________________________
>Technotes mailing list
>Technotes   lists.m4if.org
>http://lists.m4if.org/mailman/listinfo/technotes
>
>

_______________________________________________
Technotes mailing list
Technotes   lists.m4if.org
http://lists.m4if.org/mailman/listinfo/technotes