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Codec Agenda - Ver 3

Dan - jabber watcher
Jean - note taker

jdr - participating remotely.
Matthew Coffman - helping=20

Note well.=20

Bashing

=
-------------------------------------------------------------------------
0. Liaisons  (Chairs - 15 min)

Cullen

Liason documents available, treating their comments as LC comments.=20

No questions

??? - study group 16 meets next week or week after.=20

=3D=3D> ACTION: Any responses to Study group 16 should be sent by early =
next week.=20

JDR - has already sent comments.=20


=
-------------------------------------------------------------------------
1. Listening results (Christian - 15 min)=20
   draft-ietf-codec-results-00

Paul Coverdale - If there are any results for Opus ??? AMR is the lowest =
score

A few changes have been made to silk stereo that may improve =
performance.

Jean Marc - the rates for the stereo test wwere lower than usual =
testing, which explains the quality.

Paul C. - Did opus have different delays, were they consistent.=20

Jean Marc - ??? the delay in AMRWB+ is ???=20

Opus was running at 20ms.


Cullen, to the group - Comments?=20

Group silent. =20

=3D=3D> DECISION: Cullen - Take the following issues to the list:

Shall we run objective tests on speech and audio quality as well as =
runtime and memory consumption

Merging with draft-hoene-quality-01 to include some more textural =
description.s


Christian says ok.

=
-------------------------------------------------------------------------
2. Opus: (Jean-Marc - as long as it takes)
   Discuss any WGLC comments
   draft-ietf-codec-opus-10

Jean-Marc covered updates to the draft.

Time stetching - added pointers to algorithms.=20

=3D=3D Compliance =3D=3D

Eric Norvell - the bitstream is still normative even in an informational =
draft

Jean-Marc -  ??=20

Stephan Wegner - I don't care if the decoder source file or the human =
readable text is normative. Both work. There is a conformance spec that =
includes tools and description of an algorithm, how to use the tools, =
and what do to with the results.=20

Jean-Narc - it's in the draft.

Stephan - We agree, but has to be defined here. (something about =
lawyers)

Jean-Marc - the open question - How sensitive is the tool?

Stephan - pick any metric, but don't leave it open.

?? - I care how sensitive it is. The fix and floating point both passed, =
got green light. There will exist decoders that sound equally good but =
won't pass.=20

Jean-Marc - It would be unlikely for that to happen.

Stephan - If decoder implementors run the tests and they are =
red-lighted, then they will tweak their source code.=20

Jean-Marc - do we want to make more optimal encoders by setting the bar =
lower?=20

?? - ?? Beyond legal, ??

Stephan - if someone comes up with the new decoder, they can write a =
draft and we can get ipr declarations.=20

Christian Hoene - make the test lest strict and use peak.

Jean-Marc - can't use peak. Can't use proprietary standard as compliance =
tool.=20

Eric Norvell - if the test doesn't allow imperceptible differences, then =
the test is too tight.=20

Jean-Marc - who in the room cares?

Cullen - There's legal issues - need a red/green light. As for the other =
error condition, would it be better to allow things that are compliant =
but sound like crap (broad tolerance). Or narrow - noncompliance, but =
sounds fine.=20

Jean-Marc - I have another option. Float and Fixed point pass the test - =
put the bar there - we catch errors that are perceptable. Allow errors =
for float to fixed point conversions.=20

Schwarz - from proposed to standard. can we relax the standard if it's =
too tight in practice?

J-M - yes.

Stephan - It's acceptable to say you are compliant when you pass either =
the fixed or float or pay lots of money that says you're compliant. So =
long as there's an open source choice, that's ok.=20

Cullen - Anyone have an analyzer and are willing to ?

Christian - I can add conformance test for peak witin a few weeks. =
Having one test vector for fixed and float make sense.=20

J-M - ?? we allow a range around ?? (something about fixed and float)=20

Eric - it doesn't need to be a quality test. Some implementation degrade =
the quality.=20

Cullen - we all agree there has to be a clean test.

Stephan - except for ?? patent, it only covers the decoder.=20

J-M - The Skype patent covers the decoder.=20

Christian says to Eric - I do not agree.

Eric - which part?=20

?? - I support a looser test for the decoder.=20

Cullen - there are three issues:
- Should the error margin for the test be broad or narrow?
- How do we do those tests? - like use peak

J-M - on the second one - only unless someone writes it.=20

Cullen - lets talk about peak. Christian can define a peak-based metric.=20=


J-M - don't know if its feasable.

Ben Schwarz - can the test boundary be moved after the proposed standard =
is released? can we change the conformance test?=20

Cullen - We would need new IPR statements.

J-M - the IPR statements cover future changes.=20

Stephan - IPR comes into picture if one of these 4 companies sue each =
other. I'm pretty sure we are fine.=20

Cullen - I was wrong previously. We can do this.=20

Christian - peak has be used for years. The current tool hasn't been =
tested by third parties.=20

J-M - The tool was written for the codec.  =20

Stephan - this is marketing. If a company wants to trust a testing tool =
that is more well known than what we came up with. That's their choice.=20=


Gregory Maxwell - The tool was tweaked to fail real bugs. Don't know =
about peak.=20

J-M - we need to run peak with real data.=20

Eric - The tool should be used for verifying conformance, not catching =
bugs.=20

?? - maybe we need two tools - one is for finding bugs, one tells you if =
your implementation is conformant. Why use a tool that excludes good =
sounding implementations?

Cullen - We are not writing tools to find bugs.=20

J-M - We need to experiment.

Cullen - No, we don't. What are we trying do here? Tools for checking =
IPR. Anyone proposing super narrow for IPR check?

Ben Schwarz - Super narrow.=20

Matthew Coffman describes an Apple II - 6502 cassette port =
implementation. 7 out of 10 words is a reasonable pass. =20

Ben Schwarz - optimize for known objective function. A too narrow test =
can always be broadened, but not vice versa.=20

Stephan - I'm in favor of wider tests. Diffuses the risks of =
implementation.=20

J-M - if you pass the test vectors, you pass the test.

Ben Schwarz - How am I supposed to optimize the encoder if all decoders =
sound different?=20

Stephan - This is about compliance.=20

gregory - can relax it by 1db.=20

Christian - What about one test for legal, and wider test for interop?

Stephan - bad idea. If you confuse the people in this room, you will =
confuse the jury.

Cullen - take a hum on three options:
 - Wide - a broad metric, bad sounding could pass the test.
 - Narrow - the results were audibly the same,=20
            float and fixed points still pass.=20
 - Don't know/Don't care

Ralph - what's the option in the current draft?

J-M - Narrow

Cullen - Those in favor of wide approach, hum now.=20
Group hums (2 on jabber)

Cullen - Make the test very narrow, hum.=20
Group hums (7 on jabber)

=3D=3D> CONCLUSION Cullen - On the list, people support narrow. In the =
room, wide. Weak consensus. Take to the list.=20

J-M - I will try to find a compromise and take to the list.

=
--------------------------------------------------------------------------=

Opus Testing=20

Tim Terriberry presenting.

presentation will be on the website after the wg meeting.=20

Lennox - did you test on any platforms that didn't have 16-bit byte? Or =
9 bit bytes?

?? - no. (?there was some port tested briefly?)

No further questions.=20


=
--------------------------------------------------------------------------=

Issues found during WGLC

Koen Vos presenting

=3D=3D Issue 1 =3D=3D

Tim - We found these issues in the second implementation=20

Tim - We've run dtmf tones to see if they are decoded correctly. =20

=3D=3D Issue 2 =3D=3D

Lennox - packet loss during DTMF is worth testing.=20

Vos - I'll test packet loss during DTMF.



Cullen - does anyone object to the solutions?

No objections.=20

=3D=3D> ACTION: Cullen - make the changes that were presented.=20


=3D=3D Opus testing with network traces =3D=3D=20

Paul C - on packet loss, how many frames?

Vos - One frame per packet=20

Paul - What if you put more frame in a packet, has a bigger impact. Is =
error correction only good for one frame.

Vos - Only need FEC is you lose 2 packets in a row.=20

J-M - if you pack 2 frames per packet, your burst will be shorter.=20

Cullen, to the group - any questions?

None.=20

Cullen - summarizing for the minutes:=20

=3D=3D> ACTION: Update draft with WGLC comments.
=3D=3D> ACTION: Get more testing info for DTMF.

Paul - what about modems or hard of hearing?

J-M - I would put that into test that we do after standardization.

Brian Rosen - Test TTY tone when doing DTMF. It's the only tone based =
signaling used by deaf folks. Modems aren't interesting for accessibly. =
We have problems getting TTY through. If you can get DTMF though you can =
get TTY.

Cullen - do you have files? Do we send you files?

Brian - I have a guy who could do it, have to ask.

Christian - DTMF is required, fax and modem excluded.

Gregory - assume they don't work, is that a blocker?

Laughter.

Stephan - I can make files with various error percentages available for =
testing. However, media coding people need to sanity check them first.=20=







From internet-drafts@ietf.org  Mon Jan  9 12:35:27 2012
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies. This draft is a work item of the Internet Wideband Audio Codec Working=
 Group of the IETF.

	Title           : Guidelines for Development of an Audio Within the IETF
	Author(s)       : Jean-Marc Valin
                          Slava Borilin
                          Koen Vos
                          Christopher Montgomery
                          Raymond (Juin-Hwey) Chen
	Filename        : draft-ietf-codec-guidelines-07.txt
	Pages           : 21
	Date            : 2012-01-09

   This document provides general guidelines for work on developing and
   specifying an interactive audio codec within the IETF.  These
   guidelines cover the development process, evaluation, requirements
   conformance, and intellectual property issues.


A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-codec-guidelines-07.txt

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-codec-guidelines-07.txt


From Bernhard.Feiten@telekom.de  Tue Jan 10 01:38:04 2012
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Dear editors,

May be the title should be
"Guidelines for Development of an Audio Codec Within the IETF"
Instead of
"Guidelines for Development of an Audio Within the IETF"

Best regards,
Bernhard



-----Original Message-----
From: codec-bounces@ietf.org [mailto:codec-bounces@ietf.org] On Behalf Of i=
nternet-drafts@ietf.org
Sent: Montag, 9. Januar 2012 21:35
To: i-d-announce@ietf.org
Cc: codec@ietf.org
Subject: [codec] I-D Action: draft-ietf-codec-guidelines-07.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies. This draft is a work item of the Internet Wideband Audio Codec Working=
 Group of the IETF.

	Title           : Guidelines for Development of an Audio Within the IETF
	Author(s)       : Jean-Marc Valin
                          Slava Borilin
                          Koen Vos
                          Christopher Montgomery
                          Raymond (Juin-Hwey) Chen
	Filename        : draft-ietf-codec-guidelines-07.txt
	Pages           : 21
	Date            : 2012-01-09

   This document provides general guidelines for work on developing and
   specifying an interactive audio codec within the IETF.  These
   guidelines cover the development process, evaluation, requirements
   conformance, and intellectual property issues.


A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-codec-guidelines-07.txt

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

This Internet-Draft can be retrieved at:
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_______________________________________________
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies. This draft is a work item of the Internet Wideband Audio Codec Working=
 Group of the IETF.

	Title           : Guidelines for Development of an Audio Codec Within the =
IETF
	Author(s)       : Jean-Marc Valin
                          Slava Borilin
                          Koen Vos
                          Christopher Montgomery
                          Raymond (Juin-Hwey) Chen
	Filename        : draft-ietf-codec-guidelines-08.txt
	Pages           : 21
	Date            : 2012-01-10

   This document provides general guidelines for work on developing and
   specifying an interactive audio codec within the IETF.  These
   guidelines cover the development process, evaluation, requirements
   conformance, and intellectual property issues.


A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-codec-guidelines-08.txt

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-codec-guidelines-08.txt


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Date: Tue, 10 Jan 2012 05:48:21 -0500
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To: Bernhard.Feiten@telekom.de
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Cc: codec@ietf.org
Subject: Re: [codec] I-D Action: draft-ietf-codec-guidelines-07.txt
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Oops, my bad! Just submitted an update to fix that.

Thanks,

	Jean-Marc

On 10/01/12 04:37 AM, Bernhard.Feiten@telekom.de wrote:
> Dear editors,
> 
> May be the title should be
> "Guidelines for Development of an Audio Codec Within the IETF"
> Instead of
> "Guidelines for Development of an Audio Within the IETF"
> 
> Best regards,
> Bernhard
> 
> 
> 
> -----Original Message-----
> From: codec-bounces@ietf.org [mailto:codec-bounces@ietf.org] On Behalf Of internet-drafts@ietf.org
> Sent: Montag, 9. Januar 2012 21:35
> To: i-d-announce@ietf.org
> Cc: codec@ietf.org
> Subject: [codec] I-D Action: draft-ietf-codec-guidelines-07.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Internet Wideband Audio Codec Working Group of the IETF.
> 
> 	Title           : Guidelines for Development of an Audio Within the IETF
> 	Author(s)       : Jean-Marc Valin
>                           Slava Borilin
>                           Koen Vos
>                           Christopher Montgomery
>                           Raymond (Juin-Hwey) Chen
> 	Filename        : draft-ietf-codec-guidelines-07.txt
> 	Pages           : 21
> 	Date            : 2012-01-09
> 
>    This document provides general guidelines for work on developing and
>    specifying an interactive audio codec within the IETF.  These
>    guidelines cover the development process, evaluation, requirements
>    conformance, and intellectual property issues.
> 
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-codec-guidelines-07.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> This Internet-Draft can be retrieved at:
> ftp://ftp.ietf.org/internet-drafts/draft-ietf-codec-guidelines-07.txt
> 
> _______________________________________________
> codec mailing list
> codec@ietf.org
> https://www.ietf.org/mailman/listinfo/codec
> _______________________________________________
> codec mailing list
> codec@ietf.org
> https://www.ietf.org/mailman/listinfo/codec


From iesg-secretary@ietf.org  Fri Jan 13 09:17:48 2012
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Subject: [codec] Document Action: 'Guidelines for Development of an Audio Codec Within	the IETF' to Informational RFC (draft-ietf-codec-guidelines-08.txt)
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The IESG has approved the following document:
- 'Guidelines for Development of an Audio Codec Within the IETF'
  (draft-ietf-codec-guidelines-08.txt) as an Informational RFC

This document is the product of the Internet Wideband Audio Codec Working
Group.

The IESG contact persons are Robert Sparks and Gonzalo Camarillo.

A URL of this Internet Draft is:
http://datatracker.ietf.org/doc/draft-ietf-codec-guidelines/




Technical Summary

  This document provides general guidelines for work on developing and
  specifying a codec within the IETF.  These guidelines cover the
  development process, evaluation, requirements conformance, and
  intellectual property issues.

Working Group Summary
  
The document was the subject of much discussion, as the work of the CODEC working group
   in general is contentious. In general the testing aspect of this has been the most contentious, 
  due to the differing methodologies used by IETF relative to other SDOs. The IPR sections also 
  got much discussion. These were resolved without too much difficulty and we believe the 
  document reflects consensus of the group.


Document Quality

  This document does not specify a protocol and therefore there are no implementations. 
  However it has been looked at, and commented on, by numerous experts in voice coding 
  as well as experts in IETF process.

Personnel

  Robert Sparks is the responsible Area Director.
  Jonathan Rosenberg is the document shepherd.


From fluffy@fluffy.im  Thu Jan 26 07:52:18 2012
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Subject: [codec] Fwd: [ipr-announce] IPR Disclosure: Microsoft Corporation's Statement about IPR related	to draft-ietf-codec-opus-10
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I wanted to point out to the WG that Microsoft has updated their IPR =
disclosure with something that looks very similar to what is suggested =
byhttp://www.openwebfoundation.org

Cullen <co-chair>


Begin forwarded message:

> From: IETF Secretariat <ietf-ipr@ietf.org>
> Date: January 26, 2012 8:24:07 AM MST
> To: jmvalin@jmvalin.ca, koen.vos@skype.net, tterriberry@mozilla.com
> Cc: fluffy@cisco.com, jdrosen@jdrosen.net, codec@ietf.org, =
gonzalo.camarillo@ericsson.com, ipr-announce@ietf.org, =
rjsparks@nostrum.com
> Subject: [ipr-announce] IPR Disclosure: Microsoft Corporation's =
Statement about IPR related	to draft-ietf-codec-opus-10
>=20
>=20
> Dear Jean-Marc Valin, Koen Vos, Timothy Terriberry:
>=20
> An IPR disclosure that pertains to your Internet-Draft entitled =
"Definition of
> the Opus Audio Codec" (draft-ietf-codec-opus) was submitted to the =
IETF
> Secretariat on 2012-01-25 and has been posted on the "IETF Page of =
Intellectual
> Property Rights Disclosures" (https://datatracker.ietf.org/ipr/1670/). =
The title
> of the IPR disclosure is "Microsoft Corporation's Statement about IPR =
related to
> draft-ietf-codec-opus-10."");
>=20
> The IETF Secretariat
>=20
> _______________________________________________
> ipr-announce mailing list
> ipr-announce@ietf.org
> https://www.ietf.org/mailman/listinfo/ipr-announce


