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After irc help from the mpv developers, it turns out mpv 0.28.2 bugs I reported were fixed in new version 0.29.0 available since July 23. So Alt-+ (or "e" or "W") now works to zoom in to get rid of black bars, and Alt-up now works to pan up.

Thanks for your sensible reply! But clearly it's easy for a playback program to position the video anywhere it wants on the screen, just like Mac Blu-Ray Player Pro does with its Fill option... alternatively vertical centering or pan up/down would be easy to support. In fact, mpv keyboard shortcuts ...

I'm having problems playing 24:10 movie .MKVs on my new 3840 x 1600 (24:10) QHD+ monitor. My preferred player mpv in Video -> Normal Size mode puts a huge black bar on top so the bottom of the movie is truncated, and in "f" full or Window -> Zoom mode it shrinks the video so it can fit bla...