FrameQueueSink.InputQueueSize Property
Returns the current count of IFrameQueueBuffer instances held in the queued (or free) list.
Syntax: 
[C#]
public int        InputQueueSize { get; };
Remarks:

This is the size of the array returned by FrameQueueSink.PopAllInputQueueBuffers.

Note: This count changes concurrently with images arriving and being popped from the queue in other threads.

Information:

Introduced in version 3.5
See also: FrameQueueSink, FrameQueueSink.PopAllInputQueueBuffers, OutputQueueSize

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