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I'd love to know the answer to that. This is fantastic work, but it'd be a shame for it to be scunnered by rounded corners.

Because the UX folks want what they want. I want my UI out of the way, including the corners of video and my CPU load.

Easily solved by black bars just like people are used to on a TV. I assume most video players will do this when in windowed mode.

That's a good observation. Plus, you'll get black bars anyway, if you resize the window to not be the same aspect ratio as the video.