[Mp4-tech] Differences between MPEG4 and MPEG4S

[Gary Sullivan]

Oh.  The MPEG-4 Part 2 text contains a full description of the short
header format, which is identical to H.263's baseline format from an
elementary stream perspective.  In the MPEG-4 context outside of the
elementary stream there are some additional "configuration data"
headers, but the elementary stream format is the same.
The MPEG-4 video reference software (both versions) will decode such
bitstreams just fine, and the MPEG-4 conformance spec should include
some such bitstreams.  And of course the MPEG-4 part 2 text specifies
the format in full detail.
Best Regards,
-Gary
+> -----Original Message-----
+> From: Saradhi DV. [mailto:saradhidv esntechnologies.co.in] 
+> Sent: Tuesday, December 06, 2023 10:21 AM
+> To: Gary Sullivan; mp4-tech lists.mpegif.org
+> Subject: RE: [Mp4-tech] Differences between MPEG4 and MPEG4S
+> 
+> Dear Gary,
+> 
+> What I mean was MPEG4 Short headers.
+> 
+> I came to know that MPEG-4 Short headers means H.263 video stream
+> encapsulated with MPEG-4 video stream headers.
+> 
+> But is there any specification/documentation/reference code available
+> for this standard.
+> 
+> Regards,
+> Saradhi
+> 
+> -----Original Message-----
+> From: Gary Sullivan [mailto:garysull windows.microsoft.com] 
+> Sent: Tuesday, December 06, 2023 11:52 PM
+> To: Saradhi DV.; mp4-tech lists.mpegif.org
+> Subject: RE: [Mp4-tech] Differences between MPEG4 and MPEG4S
+> 
+> 
+> Saradhi et al,
+> 
+> There is nothing formally called MPEG4s or MPEG4S.  You did not say
+> where you found that acronym, so it may be difficult to help 
+> you.  From
+> a quick web search, I noticed that some people seem to be 
+> referring to
+> "an MPEG4" as a video file that has been encoded in MPEG4 format, and
+> that some people seem to be pluralizing the term by adding 
+> an "s" on the
+> end.   So that having "some MPEG4s" refers to having some 
+> MPEG4-encoded
+> files (similar to the way some people refer to having some 
+> "MP3s" when
+> they refer to having some encoded audio files that use the 
+> MPEG-1 Layer
+> 3 syntax).
+> 
+> Alternatively, one of the well-defined subsets of the 
+> technology in the
+> standard is called the "Simple profile".  Therefore, MPEG4S might
+> hypothetically refer to the Simple profile of MPEG4.
+> 
+> Best Regards,
+> 
+> Gary Sullivan 
+> 
+> +> -----Original Message-----
+> +> From: mp4-tech-bounces lists.mpegif.org 
+> +> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of 
+> Saradhi DV.
+> +> Sent: Monday, December 05, 2023 12:56 AM
+> +> To: mp4-tech lists.mpegif.org
+> +> Subject: [Mp4-tech] Differences between MPEG4 and MPEG4S
+> +> 
+> +> Dear experts,
+> +> 
+> +> I am sorry to ask the basic question to experts.
+> +> 
+> +> Can any of you tell the differences between MPEG4 and 
+> MPEG4s Video?
+> +> I trine in web for documentation of MPEH4s, but it went in vain.
+> +> 
+> +> If any of you have useful documentation about MPEH4s 
+> could you please
+> +> forward that to me or send me the links.
+> +> 
+> +> Thanks in advance.
+> +> 
+> +> Regards,
+> +> Saradhi
+> +> 
+> +> 
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+>