[M4IF Technotes] max obj in SP

[Rob Koenen]

> Does this then mean that a compliant SP   L1-3 MPEG4 decoder 
> must include a binary shape (CAE based) decoding subsystem?  

No it doesn't. The objects must be rectangular.
Best, Rob
> -----Original Message-----
> From: Daniel Larkin [mailto:larkind   eeng.dcu.ie] 
> Sent: Monday, February 03, 2024 5:40 AM
> To: rob.koenen   m4if.org; 'Gary Sullivan'; Yong wang; 
> Technotes   lists.m4if.org
> Subject: RE: [M4IF Technotes] max obj in SP
> 
> 
> Does this then mean that a compliant SP   L1-3 MPEG4 decoder 
> must include a binary shape (CAE based) decoding subsystem?  
> Based on the previous reply I assume it must if it can deal 
> with up to four objects.
> 
> Regards
> Daniel
> 
> -----Original Message-----
> From: technotes-admin   lists.m4if.org 
> [mailto:technotes-admin   lists.m4if.org]On Behalf Of Rob Koenen
> Sent: 31 January 2024 22:30
> To: 'Gary Sullivan'; rob.koenen   m4if.org; Yong wang; 
> Technotes   lists.m4if.org
> Subject: RE: [M4IF Technotes] max obj in SP
> 
> 
> Right. In Simple, we kept it simple. The typical max num MBs 
> was chosen such that it could exactly fill the typical session size.
> 
> In most other Profiles/Level combinations, you can fill it twice.
> 
> 
> Rob
> 
> > -----Original Message-----
> > From: Gary Sullivan [mailto:garysull   microsoft.com]
> > Sent: Friday, January 31, 2024 2:19 PM
> > To: rob.koenen   m4if.org; Yong wang; Technotes   lists.m4if.org
> > Subject: RE: [M4IF Technotes] max obj in SP
> > 
> > 
> > Right idea.  But actually I think the maximum total MBs is
> > given by the max vcv buffer size column in Table N-1, not the 
> > typcial session size column (one is just information about 
> > what is expected to be typical and the other is the maximum 
> allowed).
> > 
> > For example, in Simple profile level 1, you can send 4
> > "simple visual objects" (i.e., 4 rectangular video streams) - 
> > each of which is 5 macroblocks wide and 4 macroblocks tall.  
> > The total would then be 80 macroblocks, which fits within the 
> > 99 macroblock maximum.
> > 
> > In Simple profile, the "max" and "typical" sizes are the
> > same.  But in some others they are not.  For example in Core 
> > profile levels 1 and 2.
> > 
> > -Gary
> > 
> > +> -----Original Message-----
> > +> From: Rob Koenen [mailto:rob.koenen   m4if.org]
> > +> Sent: Friday, January 31, 2024 11:09 AM
> > +> To: 'Yong wang'; Technotes   lists.m4if.org
> > +> Subject: RE: [M4IF Technotes] max obj in SP
> > +> 
> > +> 
> > +> You can have 4 smaller objects, the total surface of which
> > would be
> > +> that of the 'typical session size' at max.
> > +> 
> > +> You can use that on PCs or on devices where there is a
> > picture in the
> > +> background
> > +> 
> > +> > But, since it treats the whole
> > +> > frame as one object, there is only one object
> > +> > available.
> > +> 
> > +> I don't understand what you mean by this.
> > +> 
> > +> Rob
> > +> 
> > +> > -----Original Message-----
> > +> > From: Yong wang [mailto:yongwang_2001   yahoo.com]
> > +> > Sent: Friday, January 31, 2024 11:03 AM
> > +> > To: Technotes   lists.m4if.org
> > +> > Subject: [M4IF Technotes] max obj in SP
> > +> > 
> > +> > 
> > +> > Dear erperts,
> > +> > 
> > +> > I noticed that the Max. # objects allowed in MPEG4 visual  
> > +> > SP   L1-3 is 4. But, since it treats the whole frame as 
> one object, 
> > +> > there is only one object available. How could Max. # 
> objects be 
> > +> > 4? Could anybody knidly answer my question? Thnaks a lot!
> > +> > 
> > +> > Yong
> > +> > 
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