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VideoCapture buffer

Hi

I a am totally new here.

I am trying to read images from a webcam with VideoCapture (cap >> image;).

I found out there is a buffer of 5 frames, so when I want to read a frame it is in fact an old one stored in the buffer.

Do you know where does this come from (hardware, OS, OpenCV) ? Why is that ? Why is it 5 frames and can it be changed ?