FrameQueueSink.CountOfFramesDropped Property
Returns the number of frames that were dropped by the sink due to a lack of buffers in the input queue.
Syntax: 
[C#]
public long    CountOfFramesDropped { get; };
Remarks:

This counter is reset to 0 when the sink is connected during a call to LiveStart or LivePrepare.

Information:

Introduced in version 3.5
See also: FrameQueueSink

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