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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?

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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).

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