Catalog Fields — LOC-00 §3.1

The MOQ Common Catalog defines the required base fields and optional extensions.

The LOC Streaming Format allows the following optional extensions for video media.

temporalId: Identifies the temporal layer/sub-layer encoded, starting with 0 for the base layer, and increasing with higher temporal fidelity.
spatialId: Identifies the spatial and quality layer encoded, starting with 0 for the base layer, and increasing with higher fidelity.
depends: Identifies track dependencies for a given track, usually for video media with scalable layers in separate tracks.
renderGroup: Identifies a group of time-aligned tracks which should be rendered simultaneously.
selectionParams: Selection parameters for media quality, fidelity, etc.; see next section.

Each video track can have the following associated Selection Parameters.

codec: Codec information (including profile, level, tier, etc.), as defined by the codec registrations listed in [WEBCODECS-CODEC-REGISTRY].
framerate: As defined in section 7.8 of [WEBCODECS-CODEC-REGISTRY].
bitrate: As defined in section 7.7 and 7.8 of [WEBCODECS-CODEC-REGISTRY].
width, height: As defined in section 7.8 of [WEBCODECS-CODEC-REGISTRY].
displayWidth, displayheight: As defined in section 7.7 of [WEBCODECS-CODEC-REGISTRY].

The LOC Streaming Format allows the following optional extensions for audio media.

renderGroup: Identifies a group of time-aligned tracks which should be rendered simultaneously.
selectionParams: Selection parameters for media quality, fidelity, etc.; see next section.

Each audio track can have the following associated Selection Parameters.

codec: Codec information as defined by the codec registrations listed in [WEBCODECS-CODEC-REGISTRY].
bitrate: As defined in section 7.7 and 7.8 of [WEBCODECS-CODEC-REGISTRY].
samplerate: As defined in section 7.7 of [WEBCODECS-CODEC-REGISTRY].
chanelConfig: As defined in section 7.7 of [WEBCODECS-CODEC-REGISTRY].
lang: The primary language of the track, using standard tags from [RFC5646].