[Mp4-tech] [Video: mpeg-4.2] profiles level questions.

[Rob Koenen (MPEGIF)]

Your assumption is correct.
Composition does not happen at the vidoe layer but at the systems layer.
In practice, this possibility is not used a lot (or at all). 
Level 0, which was added later, does away with this capability of splitting
the available macroblock area into multiple indpendent objects.
Rob
> -----Original Message-----
> From: mp4-tech-bounces lists.mpegif.org 
> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Grigory A.
> Sent: Monday, 28 June 2023 04:38
> To: mp4-tech lists.mpegif.org
> Subject: [Mp4-tech] [Video: mpeg-4.2] profiles level questions.
> 
> 
> Hi!
> 
> Could some one help me?
> Me question is following:
> 
> Annex N of mpeg-4.2 describes "Visual profiles levels"
> so
> does it means SP L1 can have up to 4 VO?
> and if answer is "yes" - how these 4 VO are combined on final scene?
> or if I am wrong - what does is the meaning of "4" in column
> "Max ob-jects" in this annex?
> 
> 
> -- 
> Best wishes,
> Grigory A.
> e-mail:  grigory letsvision.com
> 
> 
> 
> _______________________________________________
> NOTE: Please use clear subject lines for your posts. Include 
> [audio, [video], [systems], [general] or another apppropriate 
> identifier to indicate the type of question you have.
> 
> Note: Conduct on the mailing list is subject to the Antitrust 
> guidelines found at 
> http://www.mpegif.org/public/documents/vault/mp-out-30042-Anti
trust.php