[M4IF Technotes] Reference software Error Resilient

[Rob Koenen]

Sorry fo rth elate reply.
We think that there is no error resilient reference ref soft.
While there is syntax in the MPEG-4 Visual Standard that allows you to do
cleverthings in the case of errpors, and this syntax has
been proven to work in tests (people were indeed able to conceal 
errors by doing clever stuf) these clever things are not normatively
defined in the standard. Everybody can do their won clever thing
in the decoder, taking advantage of the tools.
Best,
Rob
-----Original Message-----
From: Gary Sullivan [mailto:garysull   microsoft.com]
Sent: Monday, January 14, 2024 14:54
To: Rob Koenen
Subject: RE: [M4IF Technotes] Reference software Error Resilient
I think the answer is no.
-----Original Message-----
From: Chang Yoong Choon [mailto:cychoon   hotmail.com]
Sent: Friday, December 21, 2023 16:44
To: rkoenen   intertrust.com; tomotohara   yahoo.com; khuber   sorensontech.com
Cc: technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] Reference software Error Resilient
Dear Rob Koenen, Tomo, Kris:
Many thanks for your kind explanation and help. I really appreciate. Anyway,
do your have any idea where I can download or get the modified Microsoft or
MoMuSys MPEG-4 reference software that can decode MPEG-4 bitstream filled
with errors? Is such decoder available for download in the internet?
Thank you.
best regards
Yoong-Choon Chang
>From: Rob Koenen 
>To: "'Tomo'" , Kris Huber , "'Chang Yoong Choon'" 
>CC: technotes   lists.m4if.org 
>Subject: RE: [M4IF Technotes] Reference software Error Resilient 
>Date: Fri, 21 Dec 2023 14:30:57 -0800 
> 
>Exactly. 
> 
>It should be clear that the objective of providing reference 
>code is not to help everyone in business with highly optimized software 
>at no cost. While setting an interoperable standard, MPEG must leave 
>room for competition between vendors, and must also see to it that 
>contributors to the standard are not asked to give away their 
>competitive advantages. 
> 
>Only the elements needed for interoperability are standardized. 
>Hence: 
>- there is no standardized encoder, and don't expect the reference 
> encoder to be optimized (Although there is another part of the 
> MPEG-4 Standard, part 7, which *will* provide a video encoder that is 
> optimized. This is going to be published early next year.) 
>- Do not expect reference decoders to be optimized beyond what it
normative. 
> 
> Error resilience tools are there to help a decoder cope with non-compliant

> 
> bitstreams that can occur as a result of errors. The response to such 
> non-compliant bitstreams is not normatively prescribed in the standard. 
> The tools have been shown to allow implementations to do a pretty decent 
> job at coping with errors, but these implementations are private to the 
> companies that built them. 
> 
> 
>Rob 
> > -----Original Message----- 
> > From: Tomo [mailto:tomotohara   yahoo.com] 
> > Sent: Friday, December 21, 2023 9:09 
> > To: Kris Huber; 'Chang Yoong Choon' 
> > Cc: technotes   lists.m4if.org 
> > Subject: RE: [M4IF Technotes] Reference software Error Resilient 
> > 
> > 
> > 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. 
> > 
> > 

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