[M4IF Technotes] Short Header

Klaus Diepold Klaus.Diepold dynapel.de
Tue Nov 13 12:03:28 EST 2001


Oops, maybe I should have posted this question to the interoperability
group.
klaus
+-----Original Message-----
+From: Gary Sullivan [mailto:garysull   microsoft.com]
+Sent: Tuesday, November 13, 2023 8:44 AM
+To: Klaus Diepold; technotes   lists.m4if.org
+Subject: RE: [M4IF Technotes] Short Header
+
+
+
++> Do you know if this type
++> of interoperability is actually tested ?
+
+By whom?  :-)
+
+It *is* one of the things in the MPEG-4 conformance
+bitstream test suite.  And I have heard several
+people say they have tested this themselves
+in various other ways.
+
+-Gary S.
+
+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: Friday, November 09, 2023 12:37 AM
++> To: Gary Sullivan; technotes   lists.m4if.org
++> Subject: RE: [M4IF Technotes] Short Header
++>
++>
++> 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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++> ++>
++> +
++> +
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