An Open, Standards-Based Framework for Audio Metadata Transport in Live Content Workflows

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: SMPTE Mot. Imag. J
Volume: 127, No. 2, pp. 18–26
Abstract: Described is a model for open audio metadata transport in live workflows that will meet the requirements for next-generation audio systems such as ATSC 3.0. The framework is standards-based and is essence agnostic. The format groups audio metadata into logical payloads that can be customized for specific use cases. It allows for bit efficient coding of audio metadata, but also allows for full, structured syntaxes, including XML-based syntaxes. The format is also not tied to a specific metadata standard. Current audio metadata standards are supported, but the format is open to support new audio formats as they arise, as well as private and/or nonstandard metadata. Realization of the framework using key-length-value (KLV) for the base structure of the format is proposed. SMPTE ST 2109 targets applications for transport in AES3 streams, for operation with existing serial digital interface (SDI) and AES3-based infrastructures. Methods for transport over internet protocol (IP) are proposed including native KLV transport using Realtime Transport Protocol (RTP) over IP, which can be utilized by ST 2110 media flows. While targeted at live production and distribution, the format takes into consideration metadata paths for emission to enable a seamless “microphone to speaker” metadata path for efficient delivery of audio metadata from content creator to the end user. Interoperation with file-based formats and workflows are also considered in the design.
Publication Date: 2018-03-01
DOI: 10.5594/JMI.2017.2786422
ISSN: Print: 1545-0279 | Electronic: 2160-2492
Link: https://doi.org/10.5594/JMI.2017.2786422
Author(s): Kent Terry
Keyword(s): ATSC 3.0, Audio, Audio Over IP, Immersive Audio, Key-length-value (KLV), Live Production, Metadata, Object-based Audio
Copyright: © 2017 SMPTE

Bibliographic Reference(s)

Immersive and Personalized Audio: A Practical System for Enabling Interchange, Distribution, and Delivery of Next-Generation Audio Experiences [Active]
AES41-1.2012 — Audio Engineering Society (AES), AES41-1-2012, “AES Standard for Digital Audio—Audio-Embedded Metadata— Part 1: General.” EXTERNAL
AES67.2015 — Audio Engineering Society (AES), AES67-2015, “AES Standard for Audio Applications of Networks–High-performance Streaming Audio-over-IP Interoperability.” EXTERNAL
ETSI.TS-103-190-1 — European Telecommunications Standards Institute (ETSI), TS 103 190-1 V1.2.1, “Digital Audio Compression (AC-4) Standard,” Section 4.3.15. EXTERNAL
EMDF-RA.org. Accessed October. 26, 2017. [Online]. Available: http://www.emdf-ra.org EXTERNAL
R-REC-BS.1738-1 — International Telecommunication Union-Radiocommunication (ITU-R), Recommendation BS.1738-1, “Identification and Ordering of 4 and 8 Track Audio Channels Carried on International Contribution Circuits,” International Telecommunications Union, Oct. 2015. EXTERNAL
IETF RFC 6597 [Active*]
SMPTE RDD 6:2008 [Active*]
SMPTE RDD 33:2015 [Active]
SMPTE ST 336:2007 [Superseded]
SMPTE ST 337:2015 [Active, Stabilized]
SMPTE ST 355:2001 [Active, Stabilized]
SMPTE ST 2020-1:2014 [Active, Stabilized]
SMPTE ST 2022-2:2007 [Active]
SMPTE ST 2022-6:2012 [Active]
SMPTE ST 2035:2009 [Superseded]

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Kent Terry; An Open, Standards-Based Framework for Audio Metadata Transport in Live Content Workflows, SMPTE Motion Imaging Journal ( Volume: 127, Issue: 2, March 2018); SMPTE, 2018. Available at https://doi.org/10.5594/JMI.2017.2786422

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Kent Terry; An Open, Standards-Based Framework for Audio Metadata Transport in Live Content Workflows, SMPTE Motion Imaging Journal ( Volume: 127, Issue: 2, March 2018); SMPTE, 2018. Available at https://doi.org/10.5594/JMI.2017.2786422

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<span class="citation">Kent Terry; <cite>An Open, Standards-Based Framework for Audio Metadata Transport in Live Content Workflows</cite>, SMPTE Motion Imaging Journal ( Volume: 127, Issue: 2, March 2018); SMPTE, 2018. Available at <a href="https://doi.org/10.5594/JMI.2017.2786422" target="_blank" rel="noopener">https://doi.org/10.5594/JMI.2017.2786422</a></span>

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Kent Terry; An Open, Standards-Based Framework for Audio Metadata Transport in Live Content Workflows, SMPTE Motion Imaging Journal ( Volume: 127, Issue: 2, March 2018); SMPTE, 2018
doi: 10.5594/JMI.2017.2786422
url: https://doi.org/10.5594/JMI.2017.2786422

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Kent Terry; <cite id="bib-10-5594-jmi-2017-2786422">An Open, Standards-Based Framework for Audio Metadata Transport in Live Content Workflows</cite>, SMPTE Motion Imaging Journal ( Volume: 127, Issue: 2, March 2018); SMPTE, 2018
<span class="doi">10.5594/JMI.2017.2786422</span>
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