[M4IF Technotes] what's the meaning of video_object_layer_shape_extension

[ssurui]

In the Table 35 of the VM18.0, video_object_layer_shape_extension decide the type and number of auxiliary components.
But I don't understand some items in this table.
For example, DISPARITY, DEPTH and USER DEFINED.
I want to know the details.
Thanks for any help.
ssurui
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