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I have 15 videos, each about 30 minutes long (a couple of them are 45 minutes long). So a total of about 8 hours of video. These are videos of people speaking on the stage at a conference. I also have slide decks that accompany the videos, but the slides are not in the video frame, they are separate files. So the speakers are talking about the slides, but you can't see the slides in the videos. I need you to use shotcut or whatever similar software you have, to combine the slides and videos side-by-side or picture-in-picture, with the correct slide showing when each speaker is talking about that slide. The final deliverable are 15 videos with the correct slides showing during the video picture-in-picture of side-by-side. I am enclosing a sample output screenshot.