Is any command to stop and pause the mplayer using the PId

hello friends i am playing mplayer from my qt application using the play button....i have two more buttons called pause and stop....in play button i used system ("mplayer "+s.toAsci开发者_运维百科i()+"&"); where s is the playlist.

In the pause button i used system("p"); but it is not working. I am able to store the process id of mplayer to a text file using system("ps -A |grep mplayer > PID.txt");. Is there any command to stop and pause the mplayer using the PId....?

Thanks in Advance

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Not with PID as far as I know. However, check out slave mode (-slave). From man mplayer:

This option switches on slave mode. This is intended for use of MPlayer as a backend to other programs. Instead of intercepting keyboard events, MPlayer will read simplistic command lines from its stdin. The section SLAVE MODE PROTOCOL explains the syntax.

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In slave mode, you can send

"pause\n" 

to pause and resume. First time you send then it will pause and the second time sending will resume the playing.