[Mp4-tech] RE: Mp4-tech Digest, Vol 12, Issue 22
Prathibhanjali
Prathibhanjali tataelxsi.co.in
Thu Jul 22 11:43:11 EDT 2004
Hi All,
Where can i find free source code for H.263 decoder(enhacements
for H.263 Plus)with Deblocking filter mode which includes four motion vector
and motion vector over picture boundaries.
Thanks in advace.
Thanks and Regards,
Prathibha
-----Original Message-----
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Today's Topics:
1. Re: [systems] AVC file format test streams (Dave Singer)
2. Re: AAC Conformance accuracy (Ralph Sperschneider)
3. Re: [Fwd: [Mp4-tech] [Audio] Difference in ISO standard and
ISO reference!] (kk codingtechnologies.com)
4. Re: [Fwd: [Mp4-tech] [Audio] Difference in ISO standard and
ISO reference!] (Dattaguru B.N.)
5. Reg diff bt 3gp&mp4 (Pradeep kumar)
----------------------------------------------------------------------
Message: 1
Date: Tue, 20 Jul 2023 10:03:18 -0700
From: Dave Singer <singer apple.com>
Subject: Re: [Mp4-tech] [systems] AVC file format test streams
To: Swapna Matwankar <smatwankar pace.stpp.soft.net>,
mp4-tech lists.mpegif.org
Message-ID: <p06100551bd2300856f05@[17.202.35.52]>
Content-Type: text/plain; charset="us-ascii"
At 2:12 PM +0530 7/20/04, Swapna Matwankar wrote:
>Hello all,
>I would like know where I can find the AVC file format(ISO/IEC
>14496-15) conformant test streams.
we are working on these at the moment. basic file format support has
had some informal exchange already, but we haven't had enough
cross-verification to declare some formal test streams.
MIF is doing some interop now on 'raw' bitstreams, and I think hopes
to get to the file format soon. ISMA will be doing interop on the
file format this fall, and I think also IMTC.
>
>regards,
>swpana
>
>_______________________________________________
>NOTE: Please use clear subject lines for your posts. Include [audio,
>[video], [systems], [general] or another apppropriate identifier to
>indicate the type of question you have.
>
>Note: Conduct on the mailing list is subject to the Antitrust
>guidelines found at
>http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php
--
David Singer
Apple Computer/QuickTime
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Message: 2
Date: Wed, 21 Jul 2023 02:33:33 +0200
From: Ralph Sperschneider <ralph.sperschneider iis.fraunhofer.de>
Subject: [Mp4-tech] Re: AAC Conformance accuracy
To: mp4-tech at MPEGIF <mp4-tech lists.mpegif.org>
Message-ID: <40FDB9DD.9010701 iis.fraunhofer.de>
Content-Type: text/plain; charset=us-ascii; format=flowed
Alfred wrote:
> Thank you for the same.
> Information regarding the the coupling channel isn't
> clear in the standards.
So?
> My understanding is that CCE maybe present even for
> stereo data.
This depends on the AOT and on the number of main audio channels permitted
in a
certain profile and level.
> The data stored in CCE improves the
> fidelity of the signal in SCE/CPE whichever it is
> coupled to.
This clearly depends on the CCE content.
> It is mainly useful in cases where the
> dynamic range of the encoded signal is higher.
I cannot retrace this conclusion.
> Also, refer to some material that gives a detail
> description about bufer_fullness in ADTS and ADIF
> formats.
ISO/IEC13818-7:2003
Best regards,
Ralph
--
Dipl.-Ing. Ralph Sperschneider | Phone: +49 9131 776 344
Fraunhofer IIS | Fax: +49 9131 776 398
Am Wolfsmantel 33 |
mailto:ralph.sperschneider iis.fraunhofer.de
D 91058 Erlangen | http://www.iis.fraunhofer.de/amm/
------------------------------
Message: 3
Date: Tue, 20 Jul 2023 17:54:33 -0800
From: kk codingtechnologies.com
Subject: Re: [Fwd: [Mp4-tech] [Audio] Difference in ISO standard and
ISO reference!]
To: Mp4-tech lists.mpegif.org, "Dattaguru B.N."
<dattagurubn yahoo.com>
Message-ID:
<OF0D0EA565.E463ACD2-ONC1256ED8.00096C1A-89256ED8.000F3836 codingtechnologi
es.com>
Content-Type: text/plain; charset="ISO-8859-1"
Dear Datta,
The reference software is correct and the text has been updated with
ISO/IEC 14496-3:2001/AMD1:2003/CORR.1:2004 and is to the best of our
knowledge correct as well.
I have implemented the reference software envelope adjuster with the exact
same loop-structure and data storage as in the revised text according to
the corrigendum, and I get bit identical results with "normal" reference
software implementation.
How to handle data storage is in my mind clearly defined for all variables
(no variable is defined without stating its corresponding range). How you
implement the data storage is of course up to you, as long as it does not
change the definition of the variables, i.e. for what time and frequency
range they are valid.
Best regards
Kristofer
---------------------------------------------------
Kristofer Kjvrling
Senior Research Engineer
Coding Technologies
phone : + 46 - (0)8 - 442 91 66
fax: + 46 - (0)8 - 33 09 88
email: kk codingtechnologies.com
>
> ----- Message from "Dattaguru B.N." <dattagurubn yahoo.com> on Sun,
> 18 Jul 2023 23:08:50 -0700 (PDT) -----
>
> To:
>
> Mp4-tech lists.mpegif.org
>
> Subject:
>
> [Mp4-tech] [Audio] Difference in ISO standard and ISO reference!
>
> Dear All,
>
> While analysing the ISO reference code(15-Mar-2004)
> and ISO standard for SBR(N5570 a.k.a ISO/IEC
> 14496-3:2001/FDAM 1:2003(E)), I found some of the
> difference listed here under. These are found to be
> crucial from the perspective of the conformance, when
> we were testing the decoder.
>
> Can anybody suggest me how to correlate between
> standard and the reference? Or is it that I am using
> standard which is not upto date??? If so, how do I get
> the most recent version.
>
> 1. HFAdjustment: while estimating the current Envelope
> (sec.4.6.18.7.3 in N5570), the reference decoder will
> perform the calculation of Ecurr in two different
> loops with a single loop! I tried to match these two
> loops, but the loop variables were found to be un
> related!!! The standard clearly given different loop
> variables for two conditions.
>
> 2. Storing of Previous data: The standard does not
> specify anything about the storing of previous data.
> We tried to follow the standard, and were storing it
> at the end of decoding. But, the reference decoder
> will store some of the data at the same place where
> new data gets calculated.
>
> These are the few examples. Similar problems also can
> be found in other modules as well.
>
> Thanks in advance,
> Thanks and regards,
> Datta
>
>
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Vote for the stars of Yahoo!'s next ad campaign!
> http://advision.webevents.yahoo.com/yahoo/votelifeengine/
>
> _______________________________________________
> NOTE: Please use clear subject lines for your posts. Include [audio,
> [video], [systems], [general] or another apppropriate identifier to
> indicate the type of question you have.
>
> Note: Conduct on the mailing list is subject to the Antitrust
> guidelines found at http://www.mpegif.org/public/documents/vault/mp-
> out-30042-Antitrust.php
------------------------------
Message: 4
Date: Tue, 20 Jul 2023 22:00:22 -0700 (PDT)
From: "Dattaguru B.N." <dattagurubn yahoo.com>
Subject: Re: [Fwd: [Mp4-tech] [Audio] Difference in ISO standard and
ISO reference!]
To: kk codingtechnologies.com
Cc: Mp4-tech lists.mpegif.org
Message-ID: <20040721050022.81920.qmail web20109.mail.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Dear All,
Thanks for your support and suggestions. To check my
understanding,
the updated standard document is
N6432 (ISO/IEC 14496-3:2001/AMD1:2003/Cor.1:2003(E)).
Dear Mr. KK, are you referring to this document? If I
am wrong, please correct!!
Thanks again,
Regards,
Datta
--- kk codingtechnologies.com wrote:
> Dear Datta,
>
> The reference software is correct and the text has
> been updated with
> ISO/IEC 14496-3:2001/AMD1:2003/CORR.1:2004 and is to
> the best of our
> knowledge correct as well.
> I have implemented the reference software envelope
> adjuster with the exact
> same loop-structure and data storage as in the
> revised text according to
> the corrigendum, and I get bit identical results
> with "normal" reference
> software implementation.
> How to handle data storage is in my mind clearly
> defined for all variables
> (no variable is defined without stating its
> corresponding range). How you
> implement the data storage is of course up to you,
> as long as it does not
> change the definition of the variables, i.e. for
> what time and frequency
> range they are valid.
>
> Best regards
> Kristofer
>
> ---------------------------------------------------
> Kristofer Kjvrling
> Senior Research Engineer
> Coding Technologies
>
> phone : + 46 - (0)8 - 442 91 66
> fax: + 46 - (0)8 - 33 09 88
> email: kk codingtechnologies.com
>
>
> >
> > ----- Message from "Dattaguru B.N."
> <dattagurubn yahoo.com> on Sun,
> > 18 Jul 2023 23:08:50 -0700 (PDT) -----
> >
> > To:
> >
> > Mp4-tech lists.mpegif.org
> >
> > Subject:
> >
> > [Mp4-tech] [Audio] Difference in ISO standard and
> ISO reference!
> >
> > Dear All,
> >
> > While analysing the ISO reference
> code(15-Mar-2004)
> > and ISO standard for SBR(N5570 a.k.a ISO/IEC
> > 14496-3:2001/FDAM 1:2003(E)), I found some of the
> > difference listed here under. These are found to
> be
> > crucial from the perspective of the conformance,
> when
> > we were testing the decoder.
> >
> > Can anybody suggest me how to correlate between
> > standard and the reference? Or is it that I am
> using
> > standard which is not upto date??? If so, how do I
> get
> > the most recent version.
> >
> > 1. HFAdjustment: while estimating the current
> Envelope
> > (sec.4.6.18.7.3 in N5570), the reference decoder
> will
> > perform the calculation of Ecurr in two different
> > loops with a single loop! I tried to match these
> two
> > loops, but the loop variables were found to be un
> > related!!! The standard clearly given different
> loop
> > variables for two conditions.
> >
> > 2. Storing of Previous data: The standard does
> not
> > specify anything about the storing of previous
> data.
> > We tried to follow the standard, and were storing
> it
> > at the end of decoding. But, the reference
> decoder
> > will store some of the data at the same place
> where
> > new data gets calculated.
> >
> > These are the few examples. Similar problems also
> can
> > be found in other modules as well.
> >
> > Thanks in advance,
> > Thanks and regards,
> > Datta
> >
> >
> >
> >
> >
> >
> > __________________________________
> > Do you Yahoo!?
> > Vote for the stars of Yahoo!'s next ad campaign!
> >
>
http://advision.webevents.yahoo.com/yahoo/votelifeengine/
> >
> > _______________________________________________
> > NOTE: Please use clear subject lines for your
> posts. Include [audio,
> > [video], [systems], [general] or another
> apppropriate identifier to
> > indicate the type of question you have.
> >
> > Note: Conduct on the mailing list is subject to
> the Antitrust
> > guidelines found at
> http://www.mpegif.org/public/documents/vault/mp-
> > out-30042-Antitrust.php
>
>
__________________________________
Do you Yahoo!?
Vote for the stars of Yahoo!'s next ad campaign!
http://advision.webevents.yahoo.com/yahoo/votelifeengine/
------------------------------
Message: 5
Date: Wed, 21 Jul 2023 15:43:56 +0100 (BST)
From: Pradeep kumar <vdeepu2 yahoo.co.in>
Subject: [Mp4-tech] Reg diff bt 3gp&mp4
To: mp4-tech lists.mpegif.org
Message-ID: <20040721144356.83207.qmail web8307.mail.in.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"
hi, what is the differences between 3gp and mp4 format? Can a 3gp decoder
will run mp4 files, what are the modifications to be done ?
2)where i can get the raw,mp4 video streams for testing ?
thanks in advance
pradeep
Yahoo! India Careers: Over 65,000 jobsonline.
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_______________________________________________
Please use clear subject lines for your posts. Include [audio, [video],
[systems], [general] or another apppropriate identifier to indicate the type
of question you have.
Conduct on the mailing list is subject to the Antitrust guidelines found at
http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php
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