[M4IF Technotes] Reference software Error Resilient

[Tomo]

Hello.
 I think this is one of the portions left open to "decoder system"
designer and it is one of the technologies that each indivisual
or corporation can add proprietary algorithm.  There are several
technical papers.  
 Even MPEG-2, I noticed certian DVD players are very stable against
stream errors, but some not-well-designed DVD players hang up 
very miserablly. 
--- Kris Huber <khuber   sorensontech.com> wrote:
> Hello Yoong-Choon,
>  
> Yes, I think what you say is true of the reference software not
> handling
> bitstreams with errors.  Many parts of error resilience you are free
> to do
> as you wish, as there are various ways of doing it.  I'm sure there
> are
> technical papers and likely companies and consultants that can help
> figure
> out how to do that, or to do it outright.  At some point during the
> standardization process I think there were experiments to prove that
> the
> error-resilient syntax elements provided were sufficient to implement
> effective error resilience (or something sufficient to achieve
> consensus on
> the technical merit of the syntax), but the reference software does
> not
> necessarily include non-normative features.  A conformant a decoder
> is free
> to crash in the case of a bitstream error, just as the reference
> software
> does, or it may do something very simple like produce black VOPs
> until the
> next video sequence comes along.  What the conformant decoder (of
> profiles
> including the error-resilience tools) must do is to properly decode
> the
> error-resilient syntax when there are no bitstream errors.  This
> ensures
> that encoders can safely use the error-resilient syntax in the
> broadcast
> situation, for example, instead of having to transmit a version for
> the
> reliable channels and another version for the error-prone channels. 
> Such an
> approach has the potential to be more bandwidth-efficient overall
> (the
> dual-channel approach is still possible using MPEG video, of course).
>  For
> decoders operating at the end of an error-prone link, what is done
> with the
> syntax elements designed to enable error-resilience becomes more
> important.
> But what is appropriate is an implementation decision that depends
> upon how
> much computation and memory is available at the decoder, not to
> mention the
> error characteristics of the particular channel and the encoder's
> usage of
> the syntax.  The market is left to sort out and ultimately decide
> among the
> numerous possibilities for the error-resient decoder functionality.
>  
> Regards,
> Kris
> 
> -----Original Message-----
> From: Chang Yoong Choon [mailto:cychoon   hotmail.com]
> Sent: Thursday, December 20, 2023 6:25 PM
> To: technotes   lists.m4if.org
> Subject: [M4IF Technotes] Reference software Error Resilient
> 
> 
> Dear All:
>  
> I am using Microsoft ISO MPEG-4 reference software. Whenever I try to
> decode
> MPEG-4 bitstream with errors, the decoder will crash or stop
> decoding.
> According to ISO MPEG-4 reference software manual, the current
> decoder
> supports error resilient bitstream but does not have error recovery,
> error
> detection, error concealment functions. In other words, whenever the
> decoder
> encounter bitstream error during decoding process, it will stop
> decoding.
>  
> Where can I find MPEG-4 decoder that support error resilient and have
> error
> detection, error detection, error recovery, error concealment
> functions?
>  
> How can I modify the Microsoft MPEG-4 refernece software so that it
> can
> decode bitstream with errors? Which file in the source code should I
> modify?
>  
> Does MoMuSys MPEG-4 reference software decoder support error
> resilient
> functions? Can the decoder decode MPEG-4 bitstream with errors?
>  
> Many thanks for your help.
>  
> regards
> Yoong-Choon Chang
> 
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> 
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> 

=====
Tomo
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