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 Audio-Visual Event Descriptors (OSD-EVD) V1.3 if:

  1. The Data validates against the Audio-Visual Event Descriptors’ JSON Schema.
  2. All Data in the  Audio-Visual 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