[M4IF Technotes] Short Header

[YH]

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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