Global Track Attributes (Multiframe Tasks)

For videoannotation, videoplaybackannotation, and lidarannotation tasks, using the "global": true flag when defining attributes marks an attribute as a global track attribute. This means the attribute's value will be constant across the entire object track, instead of being allowed to vary from frame to frame.

  "annotation_attributes": {
    "car_color": {
      "type": "category",
      "description": "What is the color of the car?",
      "choices": ["red", "green", "blue"],
      "global": true,


Multiple Types of "Global" Attributes

Global Attributes (here) are different from Global Track Attributes for Multiframe Tasks.

Global Attributes specify a global, scene-level attribute, or an attribute of events if using events in videoannotation or videoplaybackannotation tasks. It is not used to customize the attributes of a single annotation.

Global Track Attributes (Multiframe Tasks) specify one attribute of annotations when using multiframe tasks, like videoannotation or videoplaybackannotation. Once set, all frames of the annotation must have the same, consistent attribute value. Global Track Attributes should only be used to specify annotation attributes of videoannotation , videoplaybackannotation or lidarannotation tasks.