1     Definition 2     Functional Requirements 3     Syntax
4     Semantics 5    Conformance Testing 6     Performance Assessment

1      Definition

An Item represented by a series of Scene Descriptors for a certain duration (from a start Time to an end Time).

2      Functional Requirements

Event Descriptors contains Scene Descriptors between two Times.

3      Syntax

https://schemas.mpai.community/OSD/V1.2/data/AudioVisualEventDescriptors.json

4      Semantics

Label Size Description
Header N1 Bytes Event Descriptors Header
– Standard – EventDescriptors 9 Bytes The characters “OSD-EVD-V”
– Version N2 Bytes Major version – 1 or 2 characters
– Dot-separator 1 Byte The character “.”
– Subversion N3 Bytes Minor version – 1 or 2 characters
MInstanceID N4 Bytes Identifier of M-Instance.
EventDescriptorsID N5 Bytes Identifier of Event Descriptors.
EventDescriptorsSpaceTime N6 Bytes Data about start and end Space-Time.
EventDescriptors[] N7 Bytes Collection of Scene Descriptors between Start Time and End Time
– SceneDescriptors N8 Bytes Set of  Scene Descriptors of IDs.
DescrMetadata N9 Bytes Descriptive Metadata

5     Conformance Testing

A Data instance Conforms with Event Descriptors (OSD-EVD) V1.3 if:

  1. The Data validates against the Event Descriptors’ JSON Schema.
  2. All Data in the  Event Descriptors’ JSON Schema
    1. Have the specified type
    2. Validate against their JSON Schemas
    3. Conform with their Data Qualifiers if present.

6     Performance Assessment