[Mp4-tech] Query regarding Microsoft MPEG-4 Reference Decoder toMr. Stefan A. Goor

[MALHOTRA VINKY]

Hello Stefan,
How r u? Hope u r doin well.
Thanks for all your mails,they have
been very helpful.
I had enquired about dicas SDK
on the contact details provided by you.
But,I came to know that it does not 
support temporal scalability,i.e. it
encodes the video into only one layer.
As my project revolves around dropping
frames from the Enhancement layer,
I can't use Dicas codec.
I think that I should concentrate on
the other option given by you,i.e.
making the Momusys codec error resilient.
I do not know how to go about it.
Can you just help me out with it?
Thanks in advance,
Saru Malhotra
--- "Stefan A. Goor" <stefan.goor ucd.ie> wrote:
> Hi Saru,
> I think those questions should be directed to Dicas:
> 
> dicas digital image coding GmbH
> Holsteinische Stra?e 39
> D-12161 Berlin, 
> Germany
> 
> Phone:  +49 - 30 - 85 07 43 04
> Fax:    +49 - 30 - 85 07 43 06
> http://www.dicas.de/ or 
> http://www.mpegable.com/
> 
> Hope this helps,
> Best Regards,
> Stefan
> 
> 
> > -----Original Message-----
> > From: mp4-tech-bounces lists.mpegif.org
> > [mailto:mp4-tech-bounces lists.mpegif.org]On
> Behalf Of MALHOTRA VINKY
> > Sent: 03 July 2023 15:45
> > To: mp4-tech lists.mpegif.org
> > Subject: RE: [Mp4-tech] Query regarding Microsoft
> MPEG-4 Reference
> > Decoder toMr. Stefan A. Goor
> > 
> > 
> > Hello Stefan,
> >  Your mail has been a great help.
> >  Thanx a ton.
> >  Can you just let me know,how can I 
> >  obtain Dicas SDK?Any idea if there 
> >  is some concession for Universities,
> >  I mean the University pricing of the 
> >  software?
> > Thanx,
> > Saru 
> > 
> > --- "Stefan A. Goor" <stefan.goor ucd.ie> wrote:
> > > Dear Saru Malhotra,
> > > Yes I have found a few solutions to this.
> > > The reason that the reference software doesn't
> work
> > > is because the decoders
> > > do not
> > > support error resilience:
> > > 
> > > "The syntax of MPEG-4 allows you to write
> > > error-resilient
> > > decoders. How you do build such decoders is not
> > > specified in the standard -
> > > it's an area where vendors can (and do) compete.
> > > Some decoders do not
> > > include any error robustness processing, and may
> > > indeed fail when
> > > confronted with errors."
> > > (Rob Koenen,
> > >
> >
>
http://lists.mpegif.org/pipermail/mp4-tech/2004-January/003125.html)
> > > 
> > > However I have found that the microsoft decoder
> (and
> > > possibly the MoMusys
> > > one) will
> > > decode a sequence if a filtering process is used
> to
> > > ensure that only full
> > > frames are passed
> > > to the decoder. So if a packet is lost that
> contains
> > > an Access Unit (AU)
> > > segment rather
> > > than a complete AU, none of the segments for
> that AU
> > > are passed to the
> > > decoder.
> > > You can tell if an AU segment is in a packet
> from
> > > the RTP marker bit.
> > > 
> > > I have not tried this for enhancement layers but
> I
> > > guess that it may work.
> > > 
> > > Another alternative is to buy a codec that
> supports
> > > error resilience.  We
> > > obtained the
> > > Dicas SDK and have found it to be robust for
> lossy
> > > situations.
> > > 
> > > Hope this helps,
> > > Stefan

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