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videocapture reads the same frame differently on multiple calls

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Hi, I am new to the forum. I have started using Opencv with Java a few weeks ago. In my program I use videocapture to read frames from an avi file. Yesterday I have noticed that, over different runs of my progrem, the n-th frame read from the file is different from the same n-th frame read from the same file, in a previous run. I have confirmed this by subtracting two copies of the same frame, after resetting the video capture to the same frame number. Is this expected, or am I doing something wrong?

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