[M4IF Technotes] max obj in SP

[Rob Koenen]

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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