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Ambisonics in an Ogg Opus Container
RFC 8486

Revision differences

Document history

Date Rev. By Action
2023-03-24
10 Timothy Terriberry Changed document external resources from: None to:

gitlab_repo https://gitlab.xiph.org/xiph/opus (Reference implementation)
2023-02-14
10 (System) Received changes through RFC Editor sync (added Errata tag, added Verified Errata tag)
2019-08-19
10 Gunter Van de Velde Closed request for Telechat review by OPSDIR with state 'Overtaken by Events'
2019-08-19
10 Gunter Van de Velde Assignment of request for Telechat review by OPSDIR to Joel Jaeggli was marked no-response
2018-11-02
10 (System) IANA registries were updated to include RFC8486
2018-10-29
10 (System)
Received changes through RFC Editor sync (created alias RFC 8486, changed abstract to 'This document defines an extension to the Opus audio codec to …
Received changes through RFC Editor sync (created alias RFC 8486, changed abstract to 'This document defines an extension to the Opus audio codec to encapsulate coded Ambisonics using the Ogg format.  It also contains updates to RFC 7845 to reflect necessary changes in the description of channel mapping families.', changed standardization level to Proposed Standard, changed state to RFC, added RFC published event at 2018-10-29, changed IESG state to RFC Published, created updates relation between draft-ietf-codec-ambisonics and RFC 7845)
2018-10-29
10 (System) RFC published
2018-10-23
10 (System) RFC Editor state changed to AUTH48-DONE from AUTH48
2018-10-08
10 (System) RFC Editor state changed to AUTH48 from RFC-EDITOR
2018-09-29
10 (System) RFC Editor state changed to RFC-EDITOR from EDIT
2018-08-30
10 Tero Kivinen Closed request for Last Call review by SECDIR with state 'No Response'
2018-08-28
10 (System) IANA Action state changed to RFC-Ed-Ack from Waiting on RFC Editor
2018-08-28
10 (System) IANA Action state changed to Waiting on RFC Editor from In Progress
2018-08-28
10 (System) IANA Action state changed to In Progress from Waiting on Authors
2018-08-28
10 (System) IANA Action state changed to Waiting on Authors from In Progress
2018-08-28
10 (System) IANA Action state changed to In Progress from Waiting on Authors
2018-08-27
10 (System) IANA Action state changed to Waiting on Authors from In Progress
2018-08-27
10 (System) RFC Editor state changed to EDIT
2018-08-27
10 (System) IESG state changed to RFC Ed Queue from Approved-announcement sent
2018-08-27
10 (System) Announcement was received by RFC Editor
2018-08-27
10 (System) IANA Action state changed to In Progress
2018-08-27
10 Cindy Morgan IESG state changed to Approved-announcement sent from Approved-announcement to be sent
2018-08-27
10 Cindy Morgan IESG has approved the document
2018-08-27
10 Cindy Morgan Closed "Approve" ballot
2018-08-27
10 Cindy Morgan Ballot approval text was generated
2018-08-27
10 Ben Campbell IESG state changed to Approved-announcement to be sent from Approved-announcement to be sent::AD Followup
2018-08-27
10 Jan Skoglund New version available: draft-ietf-codec-ambisonics-10.txt
2018-08-27
10 (System) New version approved
2018-08-27
10 (System) Request for posting confirmation emailed to previous authors: Michael Graczyk , Jan Skoglund
2018-08-27
10 Jan Skoglund Uploaded new revision
2018-08-16
09 Sabrina Tanamal IANA Review state changed to IANA OK - Actions Needed from IANA - Not OK
2018-08-13
09 Jan Skoglund New version available: draft-ietf-codec-ambisonics-09.txt
2018-08-13
09 (System) New version approved
2018-08-13
09 (System) Request for posting confirmation emailed to previous authors: Michael Graczyk , Jan Skoglund
2018-08-13
09 Jan Skoglund Uploaded new revision
2018-08-06
08 (System) Sub state has been changed to AD Followup from Revised ID Needed
2018-08-06
08 Jan Skoglund New version available: draft-ietf-codec-ambisonics-08.txt
2018-08-06
08 (System) New version approved
2018-08-06
08 (System) Request for posting confirmation emailed to previous authors: Michael Graczyk , Jan Skoglund
2018-08-06
08 Jan Skoglund Uploaded new revision
2018-08-02
07 Cindy Morgan IESG state changed to Approved-announcement to be sent::Revised I-D Needed from IESG Evaluation
2018-08-01
07 Suresh Krishnan [Ballot Position Update] New position, No Objection, has been recorded for Suresh Krishnan
2018-08-01
07 Ignas Bagdonas [Ballot Position Update] New position, No Objection, has been recorded for Ignas Bagdonas
2018-07-31
07 Terry Manderson [Ballot Position Update] New position, No Objection, has been recorded for Terry Manderson
2018-07-31
07 Adam Roach
[Ballot comment]
Thanks for everyone's work on this document. I have two minor comments.

---------------------------------------------------------------------------

§4:

Are implementors intended to assume that the elided matrix …
[Ballot comment]
Thanks for everyone's work on this document. I have two minor comments.

---------------------------------------------------------------------------

§4:

Are implementors intended to assume that the elided matrix coefficients are all
0.0? If so, it's probably best to say so explicitly.

---------------------------------------------------------------------------

§6:

To be clear, these code points that are being reserved are for experimental
channel mappings in general, not just channel mappings that are specific to
ambisonics, right? If so, I would suggest calling this out explicitly.
2018-07-31
07 Adam Roach [Ballot Position Update] New position, No Objection, has been recorded for Adam Roach
2018-07-31
07 Alissa Cooper [Ballot Position Update] New position, No Objection, has been recorded for Alissa Cooper
2018-07-30
07 Benjamin Kaduk
[Ballot comment]
I see that Section 5.2 attempts to Update RFC 7845 to allow for the larger
channel mapping information used by family 3, but …
[Ballot comment]
I see that Section 5.2 attempts to Update RFC 7845 to allow for the larger
channel mapping information used by family 3, but I'm still a little
unclear about what behavior I should expect from a pure RFC 7845
implementation that receives a family 3 stream.  The actual mapping table
would be "too long", but would the implementation detect that, or just note
that it's an unrecognized family and generate silence?

Section 1

I think we want to say "by adding itesm with values 2 and 3" to the
registry, since we add two entries and not a single superposed entry.

Section 3.1

While I can deduce this from the list of allowed numbers of channels,
noting that both ends of the range (0 and 14) are allowed values probably
would add clarity.
 
Section 3.2

Figure 3 could perhaps make it more clear that C and K are not necessarily
equal.

The term "side information" is used without definition (and is not used in
RFC 7845).  Does this clause really add anything in comparison to if we
just say "The matrix MUST be provided in the channel mapping table portion
of the identification header, in place of a normal channel mapping table"?

Section 5.1

Family 255 is specified in Section 5.1.1.3 of RFC 7845, not 5.1.1.4.
(Also, the unqualified Section references should probably all be of the
form Section N of RFC 7845, for the benefift of the HTML linkification
tooling.)

Section 8

Sometimes I see a "Description" column that allows for in-registry
visibility that a range is for experimental usage.  I suppose it would not
be too hard to also modify the registry structure to add such a thing, if
you want.
2018-07-30
07 Benjamin Kaduk [Ballot Position Update] New position, No Objection, has been recorded for Benjamin Kaduk
2018-07-30
07 Deborah Brungard [Ballot Position Update] New position, No Objection, has been recorded for Deborah Brungard
2018-07-30
07 Eric Rescorla
[Ballot comment]
Rich version of this review at:
https://mozphab-ietf.devsvcdev.mozaws.net/D3213



IMPORTANT
S 3.2.
>                          …
[Ballot comment]
Rich version of this review at:
https://mozphab-ietf.devsvcdev.mozaws.net/D3213



IMPORTANT
S 3.2.
>                                                        | Stream Count  |
>        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>        | Coupled Count | Demixing Matrix                              :
>        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>          Figure 4: Channel Mapping Table for Channel Mapping Family 3

Are you saying I MUST use family 3?


S 5.2.
>        The remaining channel mapping families (2...254) are reserved.  A
>        demuxer implementation encountering a 'channel mapping family'
>        value that it does not recognize SHOULD NOT attempt to decode the
>        packets and SHOULD NOT use any information except for the first 19
>        octets of the ID header packet (Fig. 2) and the comment header
>        (Fig. 10).

What is the rationale for this change? Also, why are you doing it in
this document? This seems like it's going to be extremely hard for
implementors to find in future.

This is outside the DISCUSS criteria, but I would strongly recommend
you split this into a separate document.


COMMENTS
S 3.2.
>      whether or not there is a separate non-diegetic stereo stream.  This
>      corresponds to periphonic ambisonics from zeroth to fourteenth order
>      plus potentially two channels of non-diegetic stereo.  Explicitly the
>      allowed number of channels are 1, 3, 4, 6, 9, 11, 16, 18, 25, 27, 36,
>      38, 49, 51, 64, 66, 81, 83, 100, 102, 121, 123, 144, 146, 169, 171,
>      196, 198, 225, and 227.

This seems like the same graf as in 3.1, so perhaps merge these?


S 3.2.

>                Figure 3: Demixing in Channel Mapping Family 3

>      The matrix MUST be provided as side information and MUST be stored in
>      the channel mapping table part of the identification header, c.f.
>      section 5.1.1 in [RFC7845].  The matrix replaces the need for a

I don't think you want "c.f." here, b/c "cf." means "compare". I
suspect you just want "see". Also, there's no period between c and f.


S 5.1.
>      Figure 6: Stereo Downmixing Matrix for Channel Mapping Family 2 and 3
>            - Ambisonic Channels Plus a Non-diegetic Stereo Stream

>  5.  Updates to RFC 7845

>  5.1.  Format of the Channel Mapping Table

What are the interop implications of this? I.e., is a file formatted
according to this document at all playable with an existing Ogg
decoder? If not, perhaps say so
2018-07-30
07 Eric Rescorla Ballot comment text updated for Eric Rescorla
2018-07-30
07 Eric Rescorla
[Ballot comment]
Rich version of this review at:
https://mozphab-ietf.devsvcdev.mozaws.net/D3213



IMPORTANT
S 3.2.
>                          …
[Ballot comment]
Rich version of this review at:
https://mozphab-ietf.devsvcdev.mozaws.net/D3213



IMPORTANT
S 3.2.
>                                                        | Stream Count  |
>        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>        | Coupled Count | Demixing Matrix                              :
>        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>          Figure 4: Channel Mapping Table for Channel Mapping Family 3

Are you saying I MUST use family 3?


S 5.2.
>        The remaining channel mapping families (2...254) are reserved.  A
>        demuxer implementation encountering a 'channel mapping family'
>        value that it does not recognize SHOULD NOT attempt to decode the
>        packets and SHOULD NOT use any information except for the first 19
>        octets of the ID header packet (Fig. 2) and the comment header
>        (Fig. 10).

What is the rationale for this change? Also, why are you doing it in
this document? This seems like it's going to be extremely hard for
implementors to find in future.

COMMENTS
S 3.2.
>      whether or not there is a separate non-diegetic stereo stream.  This
>      corresponds to periphonic ambisonics from zeroth to fourteenth order
>      plus potentially two channels of non-diegetic stereo.  Explicitly the
>      allowed number of channels are 1, 3, 4, 6, 9, 11, 16, 18, 25, 27, 36,
>      38, 49, 51, 64, 66, 81, 83, 100, 102, 121, 123, 144, 146, 169, 171,
>      196, 198, 225, and 227.

This seems like the same graf as in 3.1, so perhaps merge these?


S 3.2.

>                Figure 3: Demixing in Channel Mapping Family 3

>      The matrix MUST be provided as side information and MUST be stored in
>      the channel mapping table part of the identification header, c.f.
>      section 5.1.1 in [RFC7845].  The matrix replaces the need for a

I don't think you want "c.f." here, b/c "cf." means "compare". I
suspect you just want "see". Also, there's no period between c and f.


S 5.1.
>      Figure 6: Stereo Downmixing Matrix for Channel Mapping Family 2 and 3
>            - Ambisonic Channels Plus a Non-diegetic Stereo Stream

>  5.  Updates to RFC 7845

>  5.1.  Format of the Channel Mapping Table

What are the interop implications of this? I.e., is a file formatted
according to this document at all playable with an existing Ogg
decoder? If not, perhaps say so
2018-07-30
07 Eric Rescorla [Ballot Position Update] New position, No Objection, has been recorded for Eric Rescorla
2018-07-30
07 Alexey Melnikov [Ballot Position Update] New position, No Objection, has been recorded for Alexey Melnikov
2018-07-29
07 Spencer Dawkins [Ballot Position Update] New position, No Objection, has been recorded for Spencer Dawkins
2018-07-28
07 Warren Kumari [Ballot comment]
So, so far outside my area of expertise...
2018-07-28
07 Warren Kumari [Ballot Position Update] New position, No Objection, has been recorded for Warren Kumari
2018-07-24
07 Mirja Kühlewind [Ballot Position Update] New position, No Objection, has been recorded for Mirja Kühlewind
2018-07-12
07 Gunter Van de Velde Request for Telechat review by OPSDIR is assigned to Joel Jaeggli
2018-07-12
07 Gunter Van de Velde Request for Telechat review by OPSDIR is assigned to Joel Jaeggli
2018-07-10
07 Cindy Morgan Placed on agenda for telechat - 2018-08-02
2018-07-10
07 Ben Campbell IESG state changed to IESG Evaluation from Waiting for AD Go-Ahead
2018-07-10
07 Ben Campbell Ballot has been issued
2018-07-10
07 Ben Campbell [Ballot Position Update] New position, Yes, has been recorded for Ben Campbell
2018-07-10
07 Ben Campbell Created "Approve" ballot
2018-07-10
07 (System) IESG state changed to Waiting for AD Go-Ahead from In Last Call
2018-07-06
07 (System) IANA Review state changed to IANA - Not OK from IANA - Review Needed
2018-07-06
07 Sabrina Tanamal
(Via drafts-lastcall@iana.org): IESG/Authors/WG Chairs:

The IANA Functions Operator has completed its review of draft-ietf-codec-ambisonics-07. If any part of this review is inaccurate, please let …
(Via drafts-lastcall@iana.org): IESG/Authors/WG Chairs:

The IANA Functions Operator has completed its review of draft-ietf-codec-ambisonics-07. If any part of this review is inaccurate, please let us know.

The IANA Functions Operator understands that, upon approval of this document, there is a single action which we must complete.

First, in the Opus Channel Mapping Families registry located at:

https://www.iana.org/assignments/opus-channel-mapping-families/

the registry is updated with the following three, new values:

Value: 2
Reference: [ RFC-to-be; section 3.1 ]

Value: 3
Reference: [ RFC-to-be; section 3.2 ]

Value: 240-254
Reference: [ RFC-to-be; section 6 ]

As this document requests registrations in a Specification Required (see RFC 8126) registry, we will initiate the required Expert Review via a separate request. If there is no expert designated for the registry, we will work with the IESG to have one assigned. Expert review will need to be completed before your document can be approved for publication as an RFC.

The IANA Functions Operator understands that this is the only action required to be completed upon approval of this document.

Note:  The actions requested in this document will not be completed until the document has been approved for publication as an RFC. This message is meant only to confirm the list of actions that will be performed.

Thank you,

Sabrina Tanamal
Senior IANA Services Specialist
2018-07-06
07 Paul Kyzivat Request for Last Call review by GENART Completed: Ready. Reviewer: Paul Kyzivat.
2018-06-28
07 Jean Mahoney Request for Last Call review by GENART is assigned to Paul Kyzivat
2018-06-28
07 Jean Mahoney Request for Last Call review by GENART is assigned to Paul Kyzivat
2018-06-27
07 Tero Kivinen Request for Last Call review by SECDIR is assigned to Phillip Hallam-Baker
2018-06-27
07 Tero Kivinen Request for Last Call review by SECDIR is assigned to Phillip Hallam-Baker
2018-06-26
07 Amy Vezza IANA Review state changed to IANA - Review Needed
2018-06-26
07 Amy Vezza
The following Last Call announcement was sent out (ends 2018-07-10):

From: The IESG
To: IETF-Announce
CC: ben@nostrum.com, draft-ietf-codec-ambisonics@ietf.org, codec@ietf.org, tterriberry@mozilla.com, Tim …
The following Last Call announcement was sent out (ends 2018-07-10):

From: The IESG
To: IETF-Announce
CC: ben@nostrum.com, draft-ietf-codec-ambisonics@ietf.org, codec@ietf.org, tterriberry@mozilla.com, Tim Terriberry , codec-chairs@ietf.org
Reply-To: ietf@ietf.org
Sender:
Subject: Last Call:  (Ambisonics in an Ogg Opus Container) to Proposed Standard


The IESG has received a request from the Internet Wideband Audio Codec WG
(codec) to consider the following document: - 'Ambisonics in an Ogg Opus
Container'
  as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2018-07-10. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the beginning of
the Subject line to allow automated sorting.

Abstract


  This document defines an extension to the Opus audio codec to
  encapsulate coded ambisonics using the Ogg format.  It also contains
  updates to RFC 7845 to reflect necessary changes in the description
  of channel mapping families.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-codec-ambisonics/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-codec-ambisonics/ballot/

The following IPR Declarations may be related to this I-D:

  https://datatracker.ietf.org/ipr/3200/





2018-06-26
07 Amy Vezza IESG state changed to In Last Call from Last Call Requested
2018-06-26
07 Ben Campbell Last call was requested
2018-06-26
07 Ben Campbell IESG state changed to Last Call Requested from AD Evaluation::AD Followup
2018-06-26
07 Ben Campbell Last call announcement was generated
2018-06-26
07 Ben Campbell Ballot writeup was changed
2018-06-26
07 Ben Campbell Ballot approval text was generated
2018-06-19
07 (System) Sub state has been changed to AD Followup from Revised ID Needed
2018-06-19
07 Jan Skoglund New version available: draft-ietf-codec-ambisonics-07.txt
2018-06-19
07 (System) New version approved
2018-06-19
07 (System) Request for posting confirmation emailed to previous authors: codec-chairs@ietf.org, Michael Graczyk , Jan Skoglund
2018-06-19
07 Jan Skoglund Uploaded new revision
2018-06-15
06 Ben Campbell IESG state changed to AD Evaluation::Revised I-D Needed from AD Evaluation
2018-06-14
06 Ben Campbell IESG state changed to AD Evaluation from Publication Requested
2018-06-14
06 Ben Campbell
This is my AD Evaluation of draft-ietf-codec-ambisonics-06. Overall the draft is in good shape. I just have a couple of minor comments/questions, and a few …
This is my AD Evaluation of draft-ietf-codec-ambisonics-06. Overall the draft is in good shape. I just have a couple of minor comments/questions, and a few editorial comments.
————————————————

*** Substantive ***:

§3.2, last sentence: "
Also note that the total output channel number, C, MUST be set in the 3rd field of the identification header.”

Is that MUST intended as a new normative requirement? The wording makes it seem more like a statement of fact. (The prefix of “Also note that…” tends to suggest the sentence is an FYI rather than a normative requirement.

§4: I am a little confused by the MAYs in this section. Are there other alternatives? Is this an example approach? A sentence or two of context would be helpful.

*** Editorial ***:

§2: Please use the boilerplate from RFC 8174 unless there is a reason to do otherwise. (I note at least one lower case normative keyword (“should”); there may be more.

§3.1,

- first paragraph: First sentence is a fragment. Should there be a conjunction between the last two values in the list of allowed numbers of channels? (The pattern repeats in §3.2)

- figure 1: It would be helpful to define “order” and “degree” (defined in figure 2) prior to using them.

§5.2, first sentence: Missing article before “Treatment”.

§7: s/ “need take” / “need to take"
2018-06-01
06 Timothy Terriberry
As required by RFC 4858, this is the current template for the Document
Shepherd Write-Up.

Changes are expected over time. This version is dated …
As required by RFC 4858, this is the current template for the Document
Shepherd Write-Up.

Changes are expected over time. This version is dated 24 February 2012.

(1) What type of RFC is being requested (BCP, Proposed Standard,
Internet Standard, Informational, Experimental, or Historic)?  Why
is this the proper type of RFC?  Is this type of RFC indicated in the
title page header?

Proposed Standard. This is the proper type of RFC as this document adds normative requirements for implementations that wish to support ambisonics in the Ogg Opus format described by RFC 7845, and also updates RFC 7845 (if approved).

(2) The IESG approval announcement includes a Document Announcement
Write-Up. Please provide such a Document Announcement Write-Up. Recent
examples can be found in the "Action" announcements for approved
documents. The approval announcement contains the following sections:

Technical Summary

This document defines an extension to the Opus audio codec to encapsulate coded ambisonics using the Ogg format. It also contains updates to RFC 7845 to reflect necessary changes in the description of channel mapping families.

Working Group Summary

There were no particularly controversial aspects of this draft, and consensus on all decisions was generally easy to reach.

Document Quality

The format has been implemented in the open-source libopus library (using an experimental mapping family identifier), with support included in the opus-tools package. Several significant vendors have indicated a plan to implement the specification, including Gooogle, Mozilla, and the open source VideoLAN and FFmpeg projects. Mark Harris performed a particularly thorough review, and motivated many of the necessary updates to RFC 7845. In addition, the updates to the "Opus Channel Mapping Families" IANA registry were reviewed by the original authors of RFC 7845 (which created that registry).

Personnel

  Who is the Document Shepherd? Who is the Responsible Area
  Director?

Document Shepherd: Timothy B. Terriberry
Responsible Area Director: Ben Campbell

(3) Briefly describe the review of this document that was performed by
the Document Shepherd.  If this version of the document is not ready
for publication, please explain why the document is being forwarded to
the IESG.

I have been involved with this document since it was first brought to the IETF, and even originally recommended to the authors that the work be brought here. I have reviewed all of the revisions in detail, and as an author of the original RFC 7845 and a developer of the libopus open-source project, I believe that the proposed format is technically sound and explained in sufficient detail to enable other implementations. I believe this document is ready for publication.

(4) Does the document Shepherd have any concerns about the depth or
breadth of the reviews that have been performed?

No.

(5) Do portions of the document need review from a particular or from
broader perspective, e.g., security, operational complexity, AAA, DNS,
DHCP, XML, or internationalization? If so, describe the review that
took place.

This document has no AAA, DNS, DCHP, XML, or internationalization components, and I believe that it raises no new security or operation complexity issues beyond those of RFC 7845. Therefore we have not sought such review.

(6) Describe any specific concerns or issues that the Document Shepherd
has with this document that the Responsible Area Director and/or the
IESG should be aware of? For example, perhaps he or she is uncomfortable
with certain parts of the document, or has concerns whether there really
is a need for it. In any event, if the WG has discussed those issues and
has indicated that it still wishes to advance the document, detail those
concerns here.

I have no specific concerns or issues.

(7) Has each author confirmed that any and all appropriate IPR
disclosures required for full conformance with the provisions of BCP 78
and BCP 79 have already been filed. If not, explain why.

I have received confirmation from Jan Skoglund. Michael Graczyk has left Google, who was employing him to work on this draft, and I have been unsuccessful in contacting him. However, Jan Skoglund was his boss at Google and believes that any and all appropriate IPR disclosures have already been filed.

(8) Has an IPR disclosure been filed that references this document?
If so, summarize any WG discussion and conclusion regarding the IPR
disclosures.

The following IPR disclosure has been filed:
https://datatracker.ietf.org/ipr/3200/

There has been no discussion on the mailing list. Since the application has been offered with Royalty-Free, Reasonable and Non-Discriminatory terms, and only relates to one specific aspect of one possible method for encoding, we do not anticipate any issues.

(9) How solid is the WG consensus behind this document? Does it
represent the strong concurrence of a few individuals, with others
being silent, or does the WG as a whole understand and agree with it? 

I believe that all of the active WG members, which includes all of those who participated in the standardization RFC 7845, as well as several additional members who joined to participate in the standardization of this format understand and agree with this document.

(10) Has anyone threatened an appeal or otherwise indicated extreme
discontent? If so, please summarise the areas of conflict in separate
email messages to the Responsible Area Director. (It should be in a
separate email because this questionnaire is publicly available.)

No appeals or other indications of extreme discontent have been threatened or lodged.

(11) Identify any ID nits the Document Shepherd has found in this
document. (See https://www.ietf.org/tools/idnits/ and the Internet-Drafts
Checklist). Boilerplate checks are not enough; this check needs to be
thorough.

No ID nits were identified.

(12) Describe how the document meets any required formal review
criteria, such as the MIB Doctor, media type, and URI type reviews.

This document does not define a new MIB, media type, or URI type.

(13) Have all references within this document been identified as
either normative or informative?

Yes.

(14) Are there normative references to documents that are not ready for
advancement or are otherwise in an unclear state? If such normative
references exist, what is the plan for their completion?

No.

(15) Are there downward normative references references (see RFC 3967)?
If so, list these downward references to support the Area Director in
the Last Call procedure.

No.

(16) Will publication of this document change the status of any
existing RFCs? Are those RFCs listed on the title page header, listed
in the abstract, and discussed in the introduction? If the RFCs are not
listed in the Abstract and Introduction, explain why, and point to the
part of the document where the relationship of this document to the
other RFCs is discussed. If this information is not in the document,
explain why the WG considers it unnecessary.

This document updates RFC 7845. RFC 7845 is listed on the title page header, in the abstract, and is discussed in the introduction.

(17) Describe the Document Shepherd's review of the IANA considerations
section, especially with regard to its consistency with the body of the
document. Confirm that all protocol extensions that the document makes
are associated with the appropriate reservations in IANA registries.
Confirm that any referenced IANA registries have been clearly
identified. Confirm that newly created IANA registries include a
detailed specification of the initial contents for the registry, that
allocations procedures for future registrations are defined, and a
reasonable name for the new registry has been suggested (see RFC 5226).

I confirm that all protocol extensions that the document makes are associated with the appropriate reservations in an IANA registry, and that the referenced IANA registry has been clearly identified. This document does not create any new IANA registries.

(18) List any new IANA registries that require Expert Review for future
allocations. Provide any public guidance that the IESG would find
useful in selecting the IANA Experts for these new registries.

N/A

(19) Describe reviews and automated checks performed by the Document
Shepherd to validate sections of the document written in a formal
language, such as XML code, BNF rules, MIB definitions, etc.

No sections of the document are written in a formal language.
2018-06-01
06 Timothy Terriberry Responsible AD changed to Ben Campbell
2018-06-01
06 Timothy Terriberry IETF WG state changed to Submitted to IESG for Publication from WG Document
2018-06-01
06 Timothy Terriberry IESG state changed to Publication Requested
2018-06-01
06 Timothy Terriberry IESG process started in state Publication Requested
2018-06-01
06 Timothy Terriberry Changed consensus to Yes from Unknown
2018-06-01
06 Timothy Terriberry Intended Status changed to Proposed Standard from None
2018-06-01
06 Timothy Terriberry Changed document writeup
2018-05-31
Jenny Bui Posted related IPR disclosure: Google LLC's Statement about IPR related to draft-ietf-codec-ambisonics
2018-05-22
06 Timothy Terriberry Notification list changed to Tim Terriberry <tterriberry@mozilla.com>
2018-05-22
06 Timothy Terriberry Document shepherd changed to Tim Terriberry
2018-05-21
06 Jan Skoglund New version available: draft-ietf-codec-ambisonics-06.txt
2018-05-21
06 (System) New version approved
2018-05-21
06 (System) Request for posting confirmation emailed to previous authors: Michael Graczyk , Jan Skoglund
2018-05-21
06 Jan Skoglund Uploaded new revision
2018-05-01
05 Jan Skoglund New version available: draft-ietf-codec-ambisonics-05.txt
2018-05-01
05 (System) New version approved
2018-05-01
05 (System) Request for posting confirmation emailed to previous authors: Michael Graczyk , Jan Skoglund
2018-05-01
05 Jan Skoglund Uploaded new revision
2018-04-30
05 (System) Request for posting confirmation emailed to previous authors: Michael Graczyk , Jan Skoglund
2018-04-30
05 Jan Skoglund Uploaded new revision
2017-10-30
04 Jan Skoglund New version available: draft-ietf-codec-ambisonics-04.txt
2017-10-30
04 (System) New version approved
2017-10-30
04 (System) Request for posting confirmation emailed to previous authors: Michael Graczyk , Jan Skoglund
2017-10-30
04 Jan Skoglund Uploaded new revision
2017-05-02
03 Jan Skoglund New version available: draft-ietf-codec-ambisonics-03.txt
2017-05-02
03 (System) New version approved
2017-05-02
03 (System) Request for posting confirmation emailed to previous authors: codec-chairs@ietf.org, Michael Graczyk , Jan Skoglund
2017-05-02
03 Jan Skoglund Uploaded new revision
2017-03-29
02 Timothy Terriberry Added to session: IETF-98: codec  Thu-0900
2017-03-27
02 Jan Skoglund New version available: draft-ietf-codec-ambisonics-02.txt
2017-03-27
02 (System) New version approved
2017-03-27
02 (System) Request for posting confirmation emailed to previous authors: Michael Graczyk , Jan Skoglund
2017-03-27
02 Jan Skoglund Uploaded new revision
2016-11-21
01 Jan Skoglund New version available: draft-ietf-codec-ambisonics-01.txt
2016-11-21
01 (System) New version approved
2016-11-21
01 (System) Request for posting confirmation emailed to previous authors: "Michael Graczyk" , codec-chairs@ietf.org
2016-11-21
01 Jan Skoglund Uploaded new revision
2016-07-19
00 Timothy Terriberry This document now replaces draft-graczyk-codec-ambisonics instead of None
2016-07-19
00 Michael Graczyk New version available: draft-ietf-codec-ambisonics-00.txt