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

[Rob Koenen (MPEGIF)]

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 
> 
> 
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