[M4IF Technotes] max of 4 objects in SP/ASP

[Rob Koenen]

MPEG-4 Systems would give you the ability to composite the objects.
MPEG-4 Visual and MPEG-4 Systems have been defined in a coherent 
fashion. This reflects the object-based nature of MPEG-4. As of today,
this isn't used in many applications, although on a PC you could do
cool things with the different objects (and you are also free to define 
their aspect ratios given the MB size restrictions).
Without MPEG-4 Systems, a stream would normally contain one single object.
Rob
> -----Original Message-----
> From: Gaurav Aggarwal [mailto:guraaf   yahoo.co.in] 
> Sent: Thursday, October 03, 2023 1:26
> To: technotes   lists.m4if.org
> Subject: RE: [M4IF Technotes] max of 4 objects in SP/ASP
> 
> 
> Thanks a lot for replying. I should have realized on my own :(
> 
> Anyhow, what to do with the 4 objects? We would need some
> kind of compositor, right? But this doesn't seem to part of 
> the spec. So are we open to the method used to display 1 or more 
> out of the 4 objects that may come in the stream.
> 
> Gaurav
> 
> > -----Original Message-----
> > From: Rob Koenen [mailto:rkoenen   intertrust.com]
> > Sent: Tuesday, October 01, 2023 8:40 PM
> > To: 'Gaurav Aggarwal'; 'technotes   lists.m4if.org'
> > Subject: RE: [M4IF Technotes] max of 4 objects in SP/ASP
> > 
> > 
> > The total size of the objects is always the same, whether
> > you have one large object or a max of 4 smaller ones.
> > The encoder/author can choose how to distribute resources
> > (Macroblocks) over the different objects.
> > 
> > So decode bandwidth is not affected.
> > 
> > Rob
> > 
> > 
> > > -----Original Message-----
> > > From: Gaurav Aggarwal [mailto:guraaf   yahoo.co.in]
> > > Sent: Tuesday, October 01, 2023 7:47
> > > To: technotes   lists.m4if.org
> > > Subject: [M4IF Technotes] max of 4 objects in SP/ASP
> > > 
> > > 
> > > Hi all,
> > > 
> > > Need to understand the max of 4 objects in SP/ASP. If I want to 
> > > build a decoder, then should I have the capability to decode 4 
> > > objects (coming on different PIDs, I suppose) in real 
> time and then 
> > > compose them?? Isn't that a lot of decode bandwidth 
> expected? Or is 
> > > it enough to decode a single object?
> > > 
> > > Thanks in advance,
> > > Gaurav
> 
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