AVCaptureOutput.DataDroppedReason.lateData
The system dropped data because you’ve configured capture output to drop data when delegate queue is in a blocked state, and there’s data to deliver.
Declaration
case lateDataDiscussion
Use the alwaysDiscardsLateVideoFrames property of AVCaptureVideoDataOutput or the alwaysDiscardsLateDepthData property of AVCaptureDepthDataOutput to choose whether the capture output discards data.