NMOS – Getting Started
Resources for NMOS Implementers and Integrators
There is a continued interest in building systems which use the NMOS specifications and implementing these developments.
To make it easy, this page lists the important information that we currently have and where to find it. It’s organised by functional areas:
● Core
● Security
● Compressed Streams
● Control & Monitoring
● Systems
● Testing
Getting started quickly
There are a few resources that can get you up and running with NMOS relatively quickly.
Two things you might want to explore are the Easy NMOS tool from Nvidia and the nmoscpp implementation from Sony.
If you already have an initial NMOS implementation, be sure to look at the NMOS Test Utilities and watch a video on the NMOS Test Utilities as well.
Asking questions
AMWA members can post questions or comments on the appropriate Slack or Basecamp workspaces. Please contact Tina Lipscomb if you do not already have access. Members and non-members are invited to post Issues and questions that have to do with the NMOS specifications, open source implementations or the Testing Tool on the relevant GitHub repo.
Non-members are welcome to post technical questions about NMOS on the public AMWA Slack workspace. If you have questions about the AMWA, NMOS-related activities and presentations at upcoming events, etc., please use the Contact Form on the AMWA website.
You may also find answers to your questions on the #nmos channel on the video-dev Slack workspace.
Specifications
A complete index of published, WIP and deprecated NMOS specifications . The index is grouped by specification type (Interface Specifications, Data Model Specifications, etc) and sorted by specification id (IS-04, IS-05, etc), rather than grouped by functional area.
The Technical Overview also explains how to find and navigate through the specifications.
All NMOS specifications have their “source” on GitHub, for example https://github.com/AMWA-TV/is-04, which is automatically formatted and rendered to AMWA’s specification site, e.g. https://specs.amwa.tv/is-04, including documentation, APIs and examples, and access to particular versions of the specification (for example https://specs.amwa.tv/is-04/latest is the most recent IS-04 release, while https://specs.amwa.tv/is-04/v1.2 is the latest release of IS-04 v1.2) and work-in-progress versions.
Informative Documents
AMWA Specifications with “INFO-” identifiers are “Informative Documents”, and are used to provide implementation guides and other non-normative information. While informative in nature, and not formal technical specifications, they provide much information on how to use NMOS and are good resources for someone just getting introduced to this ecosystem. For example, the article on NMOS use of DNS-SD provides helpful guidance for those looking to implement DNS-SD in a networked media environment. As with all Specifications, INFO documents.
Parameter Registers and Control Feature sets
Specifications often make use of defined parameter values in NMOS APIs, for example JSON representing a video Flow will include a format parameter with value urn:x- nmos:format:video.
You can find the NMOS parameter registers here.
Similarly the NMOS Control & Monitoring specifications make use of “control feature sets”
Implementations
The “NMOS-controlled products” page provides links to lists of commercial NMOS-capable media nodes, registries and controllers. There is also a list of open source and free implementations.
There have been a number of excellent presentations on NMOS over the years made at the IP Showcase. You can find these on the IP Showcase website under “Resources.”
● AMWA NMOS: Powered by Open Source
● Bringing Up a NMOS-Capable ST 2110 Media Processing Node in 30 Minutes
If you have created an NMOS implementation, you will want to look at the section of this document detailing resources available for NMOS Testing.
Resources
NMOS Core
Specifications
● IS-04: Discovery & Registration
● IS-05: Device Connection Management
● IS-08: Audio Channel Mapping
● IS-11: Stream Compatibility Management
● IS-13: Annotation
● BCP-002-01: Natural Grouping
● BCP-002-02: Asset Distinguishing Information
● NMOS Parameter Registers (See the AMWA GitHub site)
Informative Documents
● INFO-004: Implementation Guide for DNS-SD
● INFO-005: Implementation Guide for NMOS Controllers
● INFO-003: Sink Metadata Processing Architecture
Open source / free software resources
● Sony’s nmos-cpp: C++ registry and node. It supports NMOS core and many other
specs and features and has been used as the basis of several manufacturers’
implementations
● Open source sender and receiver framework
● Sony’s nmos-js: Simple JavaScript (React) control application.
● Easy NMOS: provides Docker Compose scripts to deploy Sony’s open
source tools. See instructional videos here.
● Riedel’s NMOS Explorer (free, not open source) control application
● AMWA’s Device control mock application (see below)
NMOS Security
Specifications
● IS-10: Authorization
● BCP-003-01: Secure Communications
● BCP-003-02: Authorization
● BCP-003-03: Certificate Provisioning
Informative Documents
● INFO-002: Security
Open source / free software resources
● nmos-cpp
● Open source sender and receiver framework
Presentations
NMOS Compressed Streams
Specifications:
● BCP-006-01: NMOS With JPEG-XS
● BCP-006-02: NMOS With H.264
● BCP-006-03: NMOS With H.265
● BCP-007-01: NMOS With NDI
Open source / free software resources:
Work is commencing on an open source sender-receiver framework, which will support
H.264 and H.265.
NMOS Systems
Specifications:
● IS-07: Event & Tally
● IS-09: System Parameters
● MS-04: ID & Timing Model
NMOS Control & Monitoring
Specifications:
● IS-12: Control Protocol
● IS-14: Configuration Management
● MS-05-01: Control Architecture
● MS-05-02: Control Framework
● MS-05-03: Control Block Specs
● BCP-008 Minimum Status Reporting
● Control Feature Sets
Informative Documents
● INFO-006: Device Capabilities Control
Open source / free software resources
● AMWA’s Device control mock application, written in Typescript and running on the NodeJS stack. Supports much of NMOS Core as well as NMOS Control & Monitoring ● Nmos-cpp
● Open source sender and receiver framework
NMOS Testing
Testing Tool
● AMWA’s open source tool tests Node implementations for most NMOS
specifications, and all new specifications are required to provide a test suite.
● Controller testing
● The testing tool is used to prepare for JT-NM workshops, and at the event (this repo documents the procedures used)
● It is also used in AMWA Incubator workshops
● Easy NMOS (see above) runs a testing tool
Cloud testbed
● Provides a cloud-hosted registry, DNS server, testing tool and other services
● Used by the AMWA Incubator during and between workshops
● Runs on AWS
● Accessed via WireGuard VPN
● Available to AMWA members
● Contact Peter Brightwell for access