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delay in frame processing through opencv iOS

Hi,

I am using OpenCV's VideoCapture , but the problem I am facing is that the image that I take at a certain moment does not show the latest thing that the camera sees. That is, if I take an image at timestamp t, it shows what the camera saw at timestamp (t - delta), so to say. How can I resolve this delay issue in processing frames. I have searched in google and many of them mentioned like may be due to _videoCapture->grab() function. If it so, please suggest me the alternative for _videoCapture->grab()) function to reduce this delay time? Help is highly appreciable.

Thanks in advance.