Thank you Patrick for mpv.
When fulalas mentioned it a few days ago, I built it via the SBo and I like it.
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Uh oh... this build of it does not like my system.
Clicked its item in the xfce applications menu,
Screen went totally blank and had to Ctrl_Alt_Backspace to kill X
That was the i9 machine.
Now tried it on the i7.... same thing.
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OK, it's not just _this_ build.
I had not tried it that way with the SBo build but rather simply via the cli with
mpv filename.mp4
Just now tried it and the SBo build does the same when clicking it in the xfce applications menu.