Mash keys in MPV to learn them
Check out mpv --input-test --force-window --idle. This opens an idle MPV
window to eats all keyboard inputs and report back what commands MPV would have
normally ran. In other words, mash your keyboard and mouse to learn all the
keyboard inputs!
(Spotted the above command in the MPV manpage, under Command Interface → input.conf.)
Why did I end up elbow-deep in MPV documentation? I had accidentally scrolled left or right and lost my place watching Ad Astra. Argh!!! Indeed, I disabled horizontal scrolling which defaults to seeking the track. Brush your trackpad and whoops, seeks ahead, and oopsie woopsie— spoilers! Prickly default.