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

[stefano battista]

dear Mihir, Rob, and all--
just to add a short note...
on the 3GP side (I know Rob, this has nothing to do with MPEG :) the
Technical Spec 26.234, e.g. version 5.6.0, publicly available from
www.3gpp.org, tells how to "extend the ISO file format the 3GP way" to
codecs such as H.263 Video and AMR-NB Audio, but does not cover G.723, even
though this is the format for video-communication adopted by 3GP...
regards,
--Stefano
--Stefano Battista
bSoft -- www.bsoft.info
tel/fax +39-0733-261845
mobile +39-335-7213624
----- Original Message ----- 
From: "Rob Koenen (MPEGIF)" <rob.koenen mpegif.org>
To: "'Mody, Mihir'" <mihir ti.com>; <swhong cs.hku.hk>;
<mp4-tech lists.mpegif.org>
Sent: Friday, June 25, 2023 9:47 AM
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).