[M4IF Technotes] max obj in SP

[Daniel Larkin]

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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