[M4IF Technotes] Short Header

[Gary Sullivan]

YH,
+> Does that mean that a MPEG4 decoder will be able to decode 
+> H.263 video if the short header is handled?
I said H.263 *baseline* video, not all H.263 video.
Baseline is the oldest form of H.263 with all optional enhanced
features turned off.
And the phrase "if the short header is handled" bothers me a bit.
The short header *must* be handled in nearly all profiles of MPEG-4
video (including Simple).
With those caveats, the answer is Yes.
-Gary
I've been "encouraged" to share this helpful information from our
lawyers.  This posting is provided "AS IS" with no warranties, and
confers no rights. You assume all risk for your use. (c) 2001 Microsoft
Corporation. All rights reserved.
+> -----Original Message-----
+> From: YH [mailto:yh86us   yahoo.com] 
+> Sent: Thursday, November 08, 2023 10:41 PM
+> To: Gary Sullivan
+> Cc: Klaus Diepold; technotes   lists.m4if.org
+> Subject: Re: [M4IF Technotes] Short Header
+> 
+> 
+> Hi Gary,
+> 
+> Does that mean that a MPEG4 decoder will be able to decode 
+> H.263 video if the
+> short header is handled?
+> 
+> Thank you.
+> 
+> Best regards,
+> 
+> Yude
+> 
+> Gary Sullivan wrote:
+> > 
+> > Klaus et al,
+> > 
+> > MPEG-4 video "short header" bitstreams are technically identical to
+> > H.263 "baseline" bitstreams.
+> > 
+> > All H.263 decoders are capable of decoding H.263 baseline 
+> bitstreams,
+> > and are therefore also capable of decoding MPEG-4 video 
+> short header
+> > bitstreams (at least those within their supported range of bit
+> > rate, resolution, and frame rate).
+> > 
+> > All MPEG-4 video profiles that include MPEG-4 video short header
+> > format support (which includes nearly all MPEG-4 video profiles)
+> > are also capable of decoding H.263 baseline bitstreams 
+> (within their
+> > supported range of bit rate, resolution, and frame rate).
+> > 
+> > Best Regards,
+> > 
+> > Gary Sullivan
+> > 
+> > I've been "encouraged" to share this helpful information from our
+> > lawyers.  This posting is provided "AS IS" with no warranties, and
+> > confers no rights. You assume all risk for your use. (c) 
+> 2001 Microsoft
+> > Corporation. All rights reserved.
+> > 
+> > 
+> > +> -----Original Message-----
+> > +> From: Klaus Diepold [mailto:Klaus.Diepold   dynapel.de]
+> > +> Sent: Thursday, November 08, 2023 1:36 AM
+> > +> To: technotes   lists.m4if.org
+> > +> Subject: [M4IF Technotes] Short Header
+> > +>
+> > +>
+> > +> Friends and Comrades,
+> > +>
+> > +> after having recently spent some time discussing about the
+> > +> relation between
+> > +> H.263 and MPEG-4 Visual I am all confused myself by now.
+> > +> There is the "short
+> > +> header" feature in MPEG-4 visual that appears in several
+> > +> profiles. I can
+> > +> remember that this was based on some late attempts lead by
+> > +> Gary to achieve
+> > +> some level of interoperability between MPEG-4 and H.263.
+> > +> Does this mean that
+> > +> an H.263 decoder can decode MPEG-4 "short header" streams or
+> > +> is it the other
+> > +> way around or no way around after all ? Can anybody shed a
+> > +> little more light
+> > +> on the rationale behind the "short header" ?
+> > +>
+> > +> Best Regards,
+> > +> Klaus
+> > +>
+> > +> This message was entirely written with recycled electrons.
+> > +> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+> > +> +   Klaus Diepold                                        +
+> > +> +   Dynapel Laboratories GmbH                            +
+> > +> +   Fraunhoferstr.9, D-85737 Ismaning, Germany           +
+> > +> +   T:+49 (0)89 9624 2814, F:+49 (0)89 9624 2890         +
+> > +> +   Email: klaus.diepold   dynapel.de, Web: www.dynapel.de +
+> > +> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+> > +>
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