[Mp4-tech] Audio Object Code for G.723 of MP4 format

[Rob Koenen (MPEGIF)]

You can put a lot of stuff in an MPEG-4 stream or an MP4 file that is not
MPEG-4 itself. Whether the resulting stream/file is still MPEG-4 compliant
is a matter of definition ... you can make it comply to the Systems (MP4)
syntax, but it won't be co,pliant to the codec specs. Whether that's a
problem is up to you.
Other players would be able to tell that they don't understand the object
type.
Rob
> -----Original Message-----
> From: mp4-tech-bounces lists.mpegif.org 
> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Dipankar Mitra
> Sent: Friday, 25 June 2023 10:36
> To: mp4-tech lists.mpegif.org
> Subject: RE: [Mp4-tech] Audio Object Code for G.723 of MP4 format
> 
> 
> Hi Rob, 
> Regarding ... "but it is possible to register private object 
> types and  put them in an MP4 file."
> 
> 	Does this mean that I can add any audio codec as a 
> private object type and still call it an MP4 file (.mp4 
> extension)? How will other players (which do not support the 
> audio codec) understand that the audio content is to be ignored?
> Regards,
> Dipankar
> 
> -----Original Message-----
> From: mp4-tech-bounces lists.mpegif.org 
> [mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of Rob 
> Koenen (MPEGIF)
> Sent: Friday, June 25, 2023 1:18 PM
> To: 'Mody, Mihir'; swhong cs.hku.hk; mp4-tech lists.mpegif.org
> Subject: RE: [Mp4-tech] Audio Object Code for G.723 of MP4 format
> 
> Mhihir,
> 
> thanks for the response. To add to this, Part 3 of MPEG-4 
> (MPEG-4 Audio)
> indeed does not support G.723. The MP4 file format does not support it
> natively, but it is possible to register private object types 
> and  put them
> in an MP4 file.
> 
> The MP4 file format and the MPEG-4 standard are sometimes seen as
> equivalent, especially in the press, but MP4 is really a part 
> of the larger
> MPEG-4 standard.
> 
> To be precise, MPEG-4 Part 12 gives the base text for the ISO 
> Media File
> format, and part 14 gives the MPEG-4 specific extensions. 
> Over time, the MP4
> file format has found uses outside of MPEG-4 (3GPP, JPEG2000) 
> and that's why
> MPEG has separated out the generics from the MPEG-4 
> specifics, even though
> these two parts are technically still both a part of MPEG-4.
> 
> An AVC-specific extension is also being drafted (part 15).
> 
> Best,
> Rob
> 
> > -----Original Message-----
> > From: mp4-tech-bounces lists.mpegif.org
> > [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Mody, Mihir
> > Sent: Thursday, 24 June 2023 18:57
> > To: swhong cs.hku.hk; mp4-tech lists.mpegif.org
> > Subject: RE: [Mp4-tech] Audio Object Code for G.723 of MP4 format
> >
> >
> > Hi Philip,
> >
> > The MP4 format doesn't support G.723. You should look at
> > other format like QTtime (.mov)
> >
> > Regards,
> > Mihir
> >
> > -----Original Message-----
> > From: mp4-tech-bounces lists.mpegif.org
> > [mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of
> > swhong cs.hku.hk
> > Sent: Thursday, June 24, 2023 9:22 PM
> > To: mp4-tech lists.mpegif.org
> > Subject: [Mp4-tech] Audio Object Code for G.723 of MP4 format
> >
> >
> > Dear all,
> >
> > I'm trying to add G.723 compressed audio stream to the MP4
> > formatted file. I
> > can't find the part-3 of the Standard talks about this kind
> > of audio codec.
> > Would anybody here advise me the audio object code for G.723,
> > and also I would
> > like to know what kind of standard player under Windows XP
> > can be used to
> > playback MP4 file with G.723 audio MP4 file.
> >
> > Thanks in advance.
> >
> > -- Philip
> >
> >
> > -------------------------------------------------
> > This mail sent through IMP: http://horde.org/imp/
> > _______________________________________________
> > 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
> 
> _______________________________________________
> 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
_______________________________________________
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-Antitrust.php
_______________________________________________
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-Antitrust.php