SC-07-01 meeting, New York, 2013-10

Report of the meeting of the SC-07-01 Working group on Audio Metadata held in New York, US, 2013-10-19.

The meeting was convened by chair C. Chambers.

The agenda and the report of the previous meeting, held in Rome, Italy, 2013-05-05, were approved as written.

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

Open Projects:

AES60-R Review of AES60-2011, AES standard for audio metadata - Core audio metadata
This project has an outstanding goal to harmonize with EBU T3293 as appropriate.

The EBU metadata group is just in the process of finalising version 1.5 with the new audio model and the first published draft due out in about a month.

AES-R9 AES standards project report - Considerations for standardising AES metadata sets
Nothing to report or discuss.

Development Projects:

AES-X071 Liaison with SMPTE Registration Authority
Nothing to report.

AES-X098C Administrative metadata for audio objects - Process history schema
This is still awaiting action by D. Ackerman. There was an offer from the meeting to help progress this and it is important to move forward.

AES-X114 Metadata review
The meeting was informed of work just started in SMPTE to work on audio metadata. The primary proposal to develop a multi-channel audio model using XML, and SMPTE drafting group 31FS is developing plans for this work. It was agreed that the AES should request a liaison with this work in SMPTE as it could have a direct impact on work in SC-07-01. It was agreed that there are potential interoperability issues and we need to keep an eye on this. P. Jessop kindly agreed to look though the 31FS slide pack and provide links to the SMPTE project groups referred to in this pack.

There is some work on-going in a group called Digital Data Exchange (D-DEx) (supported by recording companies are rights societies) that can best be described as participation metadata in recordings, basically gathering data on who are involved in particular studio recordings and there currently is a healthy debate on if this data can be constrained to an agree values list and granularity required. There are also issues on how this data is carried through the mixing, editing and mastering chain and who should ensure the eventual requirements are met. It is being proposed that this would be supported within the D-DEx metadata dictionary and it could be that AES60 may have a part to play in this work. To be carried forward.

There was nothing further to say on the use of metadata within live performance area from last meeting at the moment. To be carried forward.

AES-X155 AES standard for audio metadata - Production recording metadata set (iXML)
A new draft has been produced and posted to the working group site. One of the key changes was to resolve the issues where the same data is put into the iXML metadata set and the Broadcast Wave BEXT chunk (AES31-2). This involved the moving of the common BEXT data into an annex and say that if BEXT data exists, this data is takes precedence in the case of conflicts.

One of the main concerns is that the BEXT chunk is being overloaded with inappropriate information and the meeting discussed this at length.

The standards secretary said that there were a few questions on data types still outstanding and members of the meeting agreed to help clear these up off-line.

Please study the draft in the document site and fed back any further comments to the groups reflector as soon as possible as this document will proceed to the next stage very soon.


The proposed ISRC standard is now out to ballot.

New Projects:

The Chairman has raised a new project proposal to work on an audio technical metadata schema that is titled AES-X220: Professional audio technical metadata set and schema. However, the extensions to the EBU core may well cover this function so this project proposal will be held pending the new documents from the EBU.

C. Lacinak raised a proposal for a new project to provided guidance on managing the persistence of embedded audio metadata. The meeting agreed that this would be a valuable item of work.

NOTE: Since the meeting the PIR was raised and approved. The project AES-X224: Best Practices for the Management of Embedded Metadata in Audio Files has now been registered to this group with the goal of producing a guidance document.]

New business:

There was no new business.

The next meeting will be scheduled in conjunction with the AES 136th Convention in Berlin, Germany, 26 to 29 April, 2014.

AES - Audio Engineering Society