[M4IF Technotes] Short Header

[Klaus Diepold]

Gary,
thanks for taking out the time for delivering tutorials ;-).
In fact that is very helpful information. Do you know if this type
of interoperability is actually tested ?
Cheers
Klaus
+-----Original Message-----
+From: Gary Sullivan [mailto:garysull   microsoft.com]
+Sent: Thursday, November 08, 2023 7:34 PM
+To: Klaus Diepold; technotes   lists.m4if.org
+Subject: RE: [M4IF Technotes] Short Header
+
+
+
+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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+
+