SC-02-12 meeting, Online, 2020-05

Report of the meeting of the SC-02-12 Working Group on Audio Applications of Networks of the SC-02 Subcommittee on Digital Audio, held online in connection with the 149th Convention, 2020-10-09.

The meeting was convened by chair Morten Lave.

The formal notice on patent policy was read.

The report of the previous meeting, held online, in connection with the 148th Convention, 2020-05-28, was approved as written.

The agenda was approved as posted

In attendence were Richard Cabot, Thomas Lago, Morten Lave, John Grant, Jeff Berryman, Nicolas Sturmel, Kevin Gross, John Fletcher, Peter Stevens, Matt Leatherman, Paul Treleaven, David Andrews, Al Walker, Terry Walker, Terry Hilton, Eric Hoehn,, Kent Terry, Oliviet Chambin, Gints Linis, Martin Renz, Andreas Hildebrand, Simon Jones, David Prince, Stephen Scott, Wataru Hatano, Andy Rosen.

Projects assigned to this group but not mentioned here had no action requested or required - see for details.

Open Projects:

AES67-R - Review of AES67-2018 , AES standard for audio applications of networks - High-performance streaming audio-over-IP interoperability

It was reported that work is being done in SC-02-12M regarding use of AES67 in WAN context. It is not simple as there are multiple factors involved. SMPTE is pursuing a similar effort under 2110.
Furthermore, the revision of standard is ongoing, a mark-up draft is in progress and there is a large list of proposed additions on top of the ones currently being working into the draft document.
Target for the revised standard is still 2021.

Removing Offensive Language.
Changes required to avoid offensive language will be done in SC-02-12M. The group will lean on similar work done by other standards and groups and follow their lead. It is a challenge as IEEE standards still use the language and will probably lack behind in removing it. It might be helpful to look at what 2059-112 has done.
The goal is to remove offensive language, clarity depends on context and offensive language should be removed while maintaining clarity.

AES70-1-R Review of AES70-1-2018: AES standard for audio applications of networks - Open Control Architecture - Part 1: Framework
AES70-2-R Review of AES70-2-2018: AES standard for audio applications of networks - Open Control Architecture - Part 2: Class structure
AES70-3-R Review of AES70-3-2018: AES standard for audio applications of networks - Open Control Architecture - Part 3: Protocol for TCP/IP networks

No work has been done here yet, the OCA alliance working on a set of changes for 70-2021.
There are currently a total of 43 items up for change and they will be passed to SC-02-12L from the OCA Alliance soon.

Removing Offensive Language.
The group will deal with offensive language and do not anticipate any problems in doing so.

AES74-R Review of AES74-2019 AES standard for audio applications of networks -Requirements for Media Network Directories and Directory Services

Nothing to report.

AES-R16 AES Standards Report - PTP parameters for AES67 and SMPTE ST 2059-2 interoperability

Removing Offensive Language.
Will be added to the ones that needs changes due to offensive language by SC-02-12M.

AES-R17-2017 (s2018): Standards project report - AES67 Interoperability PlugFest - London 2017

Removing Offensive Language.
Use terminology which was in use at the time of the event, like a newspaper report of something that happened.
How this is addressed will be determined after addressing the same issues in AES67 such that the new terms can be correctly referred to.

AES-X242 Streaming audio metadata over IP

Work proceeding, still target to get work done this year, there is more clarity now, but it might slip into the next year.
When it reaches the draft point would like to be able to share with SMPTE. (interchange)
It would be desirable to be able to cross share drafts before either are voted on to make sure they are not diverging.
This work is proceeding into 2021.

AES-X243 AES70 Connection Management for AES67 and SMPTE ST 2110-30

A couple of months before we have a draft, it will be a 70-
Expect to be able to provide draft in 2021.

AES-X251 AES74 Conformance Survey

Survey is now drafted, published for comments, comment period closed on September 30, re-rendering into usable survey document. Members of the group will be assigned to answer the survey for the identified hitlist of technologies.


Liaison with MPEG (John Grant)

Nothing new to report.

Liaison with mobile (John Grant)

ETSI, non IP networking. The 3 documents are moving forward.
Working towards a first use in private networks, industrial applications etc.
Two things being solved:
- Latency
- Efficiency of coding

The latter important for super simple devices.
This could eventually be useful for things such as wireless microphones.

This technology also distributes time rather efficiently mostly because it grew out of media requirements and not IP like the existing Internet.

Liaison with AMWA (Anthony Kuzub)

Broadcast applications are looking at using AI and machine learning by aggregating data using the registries such as NMOS and other standard protocols.

AMWA is receiving the AES70 object model well. These contributions are important.
Berryman will provide a report for the next SC-02-12 meeting regarding the NMOS modeling and how it relates to AES70 etc. Kuzub will collaborate.

Liaison with IEC62379-1 (Common control interface, orig. BBC project in 2004, ATM etc.) (Peter Stevens)

Process gone into withdrawal - maintenance. No further work to be done for the time being.

ST 2059 (Use of PTP for professional media sync.) (Paul Treleaven)

ST 2059 part 1 and 2 should be with AES and if not, it is on its way.
Produced report on offensive language in general and an administrative guideline on how to deal with terms. Both can be shared if they have not been.
2110 expanding -41 on Metadata, the scope has been increased to include NMOS parameters.
Also -43 for time text transport is finally nearing completion.

Liaison with Avnu ProAV AVTP (Morten Lave)

Nothing to report.

Next Meeting

The next meeting will be scheduled in conjunction with the AES 150th Convention, to be held online in May 2021.

AES - Audio Engineering Society