How to play or pause the mplayer using the play and pause buttons of Qt window?

Question

How to play or pause the mplayer using the play and pause buttons of Qt window, if I know the process id? Is there any command to stop and pause using PID?

Answer 1

If you do not want to be multiplatform, in Linux you can use SIGSTOP to pause and SIGCONT to continue.

For example to stop process with PID 123:

kill -SIGSTOP 123

And then continue:

kill -SIGCONT 123

This is not directly portable to other platforms (majority of mobile phones, Windows).