[Mp4-tech] MPEG-2 AAC + SBR

[sherin tech]

Thanks a lot Andreas !! 
As u suggested, I searched for "ISO/IEC 13818-7:2003/Amd1" in  ISO
website, Website is  saying, that is Withdrawn standard. As per the
following link ..
link:
http://www.iso.ch/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=38719&ICS1=35
Is this correct information ? 
If so, which standard do I need to refer for my scenario (MPEG-2 + SBR) ???? 
But I could found a standard "ISO/IEC 13818-7:2004" 
Link : 
http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?
CSNUMBER=40886&scopelist= 
Will this help ?? 
------------------------------------------------------------------------------------------
As you said , signalling is the most important aspect. 
So, If I support *only* implicit signaling, Can I assure that, it will
cover all kinds of situation ???
------------------------------------------------------------------------------------------
One more thing I want to confirm about the MPEG-2 ADTS streams
generation with your (CT's) utility adif2mp4. The change I did in the
script 'convert' is added extra options for,
 1. MPEG-2 
 2. LC ( -p LC ) 
 3. implicit siganalling ( -k 0 ) 
 4. o/p file ADTS format. 
As, 
"$ADIF2MPEG -p LC -mpeg2 -k 0 -o adts ${FILE}.mp4 ${FILE}.adts" 
Is this fine ? 
Did I miss any more options ? 
-------------------------------------------------------------------------------------------
Hope I have conveyed my issues clearly. 
Waiting for a reply 
Thanks & regards, 
sherin 
On Fri, 7 Jan 2024 18:22:19 +0100, Andreas Schneider
<snd codingtechnologies.com> wrote:
> Hello,
> 
> ISO/IEC 13818-7:2003/AMD1 is the standard you will want to consult
> regaring SBR with MPEG-2 AAC, though signaling is probably the most
> important thing to mention.
> Conformance testing of MPEG-2 AAC with SBR happens in the same way as
> MPEG-4 HE AAC conformance testing, except that - obviously - everything
> that requires explicit signaling is disregarded.
> 
> Hope that helps,
> 
> Andreas
> 
> mp4-tech-bounces lists.mpegif.org wrote on 2023-12-14 06:01:17:
> 
> > Hi all,
> >
> > Can you people help me in the following issue ,
> >
> > I need to implement MPEG-2 AAC + SBR :
> >
> >   a)I am having MPEG-2 AAC ( no SBR ).
> >   b)I am having MPEG-4 AAC + SBR.
> >
> > What I am planning to do is, take SBR from b) and plug it in to a).
> >
> > I have mainly two issues,
> >
> > Issue 1:   Signaling of SBR.
> > ----------------------------
> >  Out of the two signaling schemes ( Implicit & Explicit ),
> >  I think implicit signaling is the one suits this scenario.
> >  (even though it will make the final system complex).
> >
> >  Do you find any problem with this choice ????
> >
> >  Do I need to consult the content providers for confirming about the
> > signaling ?
> >
> > Issue 2:  Testing for MPEG-2 + SBR.
> > -----------------------------------
> >  How do I test this setup ?
> >
> > Do you people find any more future risks in this ????
> >
> > Hope I have conveyed my doubt in a clear manner.
> >
> > Waiting for your response.
> >
> > Thanks in advance,
> >
> > sherin
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> 
> --
> Andreas Schneider, Research Engineer
> 
> Coding Technologies GmbH
> Deutschherrnstr. 15-19
> 90429 Nuernberg, Germany
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> 
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> 
>