Pause programmatically video player mpv

Question

I would like to know if there is a way to send a message to a running process on linux ?

For example, is it possible to programmatically \"pause\" a video launched w

Answer 1

kill -s STOP $(pidof mpv) and kill -s CONT $(pidof mpv)

or better :

xdotool key --window "$(xdotool search --class mpv)" p

The key "P", is set by default to pause the video.