[M4IF Technotes] Short Header

[Gary Sullivan]

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
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+> -----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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