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Linux: FRAME_QUEUE_SZ value

Tool/software: Linux

In the DemoApp example using TinTin camera there is a people tracking project -

It has a frameCallback() function where size of the frame received from device is checked against the parameter FRAME_QUEUE_SZ which is defined as 3.

Why is this parameter defined as 3 ? Any reasons for choosing 3 as the size of the queue for frames referred by frame callback function ?