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We start with a PDF file with presentation slides. We capture the video of the screen (screen streaming) while making an arbitrarily long presentation and store it in a file. We also keep the original PDF file. Then, the problem this paper attempts to solve is how to find frames in the video which correspond to transitions between pages in the slides during presentation. The method needs to be automatic and robust to complex transitions like going backwards, switching between applications, etc. This process is referred to as video slicing or video annotation and has many practical uses. The main intended uses are (1) automatic video slicing and (2) creating short sketches of longer videos.