I know I'm the one that asked the question, but I'm going to throw one out there that will blow your minds: The built-in Music app on Macs (formerly known as iTunes). I've used it for years and never had an issue. It can handle different file formats and resolutions and aspect ratios with ease, you can adjust start and end points and volume of individual videos, it works great with dual monitors (second monitor being your projector of course), and it has minimal visible UI that basically only shows up if you press pause.
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