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I have a large video file (about 6 hours long), it's a record from surveillance camera, the camera itself has no illumination features, though surveiled area has pretty good light which is triggered by motion detector.

So now I have a large video file that is mostly just a black screen, but it might contain some action.
Which software and or approach should I use to locate all action areas of the video (to watch 6 hour footage does not appeal to me).

I was thinking about video player that generates timeline of thumbnails or has built-in function to find non-black frames. I prefer solution to be free and opensource, but I have searched for a while and I am kind of desperate now, so anything (that will get the job done) will do.

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