[M4IF Technotes] Profile@Level Visual Image size
Rob Koenen
rkoenen intertrust.com
Fri Aug 17 10:57:00 EDT 2001
The amendment with this profile can be bought form ISO as of 20 Sept.
It is then still at Final Draft International Standard
stage, but the text of the standard is final and won't
change when it becomes International Standard a few months
thereafter.
Rob
> -----Original Message-----
> From: Peter Haighton [mailto:Peter.Haighton m4if.org]
> Sent: Friday, August 17, 2023 7:08 AM
> To: Arcin Bozkurt - Archie; technotes lists.m4if.org
> Subject: RE: [M4IF Technotes] Profile Level Visual Image size
>
>
> 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.
> >
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