NMOS Flow Attributes

This Flow Attributes parameter register contains extensible attributes and their permitted values which may be used in Flow resources within the AMWA IS-04 NMOS Discovery and Registration Specification.

Criteria
Attributes

Criteria

Each entry MUST be associated with an existing defined NMOS Format, and MAY additionally relate to a specific media_type.
Each entry MUST define or refer to an existing unique attribute name within the scope of a Flow.
Each entry MUST have a short description.
Each entry MUST identify any AMWA Specifications and versions from which it is valid.
Each entry MUST define all permitted values for the attribute, either via an explicit list, well-defined references or both.
Entries MAY be used to expand the set of permitted values associated with an existing extensible attribute.
Each entry MUST link to a schema definition held within this repository (unless covered by a schema within the original specification).
Additions and updates to this parameter register are to be submitted via a Pull Request (PR) according to the General Procedures and Criteria.

As noted in IS-04 v1.3, new Flow attributes may be defined here as opposed to requiring a new version of the specification.

Query APIs and their clients which support v1.3 of IS-04 or operate in a mixed-version environment MUST be tolerant to the presence of Flow attributes and values which may be added at a later date. This is further detailed in the IS-04 Upgrade Path document.

Attributes

Note: JSON schemas supporting validation of all the attributes defined in this register are available as flow_video_register.json and flow_audio_register.json. These MAY be used in addition to the schemas, such as flow_video.json and flow_audio.json, found in the AMWA IS-04 specification.

Bit Rate

Name: bit_rate
Description: Target bit rate of the codestream, in kilobits/second.
Specification: AMWA BCP-006-01
Applicability: urn:x-nmos:format:video or urn:x-nmos:format:audio
Permitted Values:
- Since AMWA IS-04 v1.3, integer values expressed in units of 1000 bits per second, rounding up

Colorspace

Name: colorspace
Description: Colorspace used for the video.
Specification: AMWA IS-04 v1.1
Applicability: urn:x-nmos:format:video
Permitted Values:
- Since AMWA IS-04 v1.1, values complying with the IS-04 schema
  - BT601
  - BT709
  - BT2020
  - BT2100
- Since AMWA IS-04 v1.3, values defined for the colorimetry format-specific parameter in any published revision of SMPTE ST 2110-20
- Since ST 2110-20:2017
  - ST2065-1
  - ST2065-3
  - UNSPECIFIED (when no other value applies)
  - XYZ
- Since ST 2110-20:2022
  - ALPHA

Components

Name: components
Description: Array of objects describing the components of the video.
Specification: AMWA IS-04 v1.1 for raw video Flows, extended for AMWA BCP-006-01 to coded video Flows since IS-04 v1.3
Applicability: urn:x-nmos:format:video

Permitted Values:

For raw video Flows, since AMWA IS-04 v1.1, values complying with the IS-04 schema
For coded video Flows, since AMWA IS-04 v1.3, values complying with the schema accompanying this register

For example:

"components": [
  { "name": "Y",  "width": 1280, "height": 720, "bit_depth": 10 },
  { "name": "Cb", "width": 640,  "height": 720, "bit_depth": 10 },
  { "name": "Cr", "width": 640,  "height": 720, "bit_depth": 10 }
]

Level

Name: level
Description: Indicates constraints on parameters of the coding tools that are in use, as defined for the Flow media type.
Specification: AMWA BCP-006-01
Applicability: urn:x-nmos:format:video
Permitted Values:
- Since AMWA IS-04 v1.3, string values defined for the Flow media type, as enumerated in the schema accompanying this register
- For video/jxsv, the values are the level names defined by ISO/IEC 21122-2, with any white space Unicode characters omitted as per RFC 9134
- For example
  - 1k-1

Profile

Name: profile
Description: Indicates the subset of coding tools that are in use, as defined for the Flow media type.
Specification: AMWA BCP-006-01
Applicability: urn:x-nmos:format:video
Permitted Values:
- Since AMWA IS-04 v1.3, string values defined for the Flow media type, as enumerated in the schema accompanying this register
- For video/jxsv, the values are the profile names defined by ISO/IEC 21122-2, with any white space Unicode characters omitted as per RFC 9134
- For example
  - Main444.12

Sublevel

Name: sublevel
Description: Indicates additional constraints on parameters of the coding tools that are in use, as defined for the Flow media type.
Specification: AMWA BCP-006-01
Applicability: urn:x-nmos:format:video
Permitted Values:
- Since AMWA IS-04 v1.3, string values defined for the Flow media type, as enumerated in the schema accompanying this register
- For video/jxsv, the values are the sublevel names defined by ISO/IEC 21122-2, with any white space Unicode characters omitted as per RFC 9134
- For example
  - Sublev3bpp

Transfer Characteristic

Name: transfer_characteristic
Description: Transfer characteristic.
Specification: AMWA IS-04 v1.1
Applicability: urn:x-nmos:format:video
Permitted Values:
- Since AMWA IS-04 v1.1, values complying with the IS-04 schema
  - SDR
  - HLG
  - PQ
- Since AMWA IS-04 v1.3, values defined for the TCS format-specific parameter in any published revision of SMPTE ST 2110-20
- Since ST 2110-20:2017
  - LINEAR
  - BT2100LINPQ
  - BT2100LINHLG
  - ST2065-1
  - ST428-1
  - DENSITY
  - UNSPECIFIED (when no other value applies)
- Since ST 2110-20:2022
  - ST2115LOGS3

Documentation built at 10:40:44 CDT on 2025-07-30.