MPV player time format HH:MM:SS or HH:MM:SS:mmm

from window:

click the LEFT timestamp

from command:

mpv .. --script-opts=osc-timems=yes ..

or add in lua-settings/osc.conf:

timems=yes

yes, add the line osd-fractions to mpv.config. this will show milliseconds in the OSD (which will appear in mpv's terminal display).

if you want to see milliseconds in the OSC (in the video window), also add the line osd-level=2 to mpv.conf. this will add a status message with the OSD time display (which is now in milliseconds) to the top of the window.

Or you can click the time display on the video each time you load a video.

mpv --osd-fractions --osd-level=2 or add to config

To toggle show - hide with keyboard, append to to input.conf:

o cycle-values osd-level 2 1

^-- or any other key