[MPlayer-users] Two Mplayer Question

[EdwardHuang]

Dear all,

I am a beginner of programming, but I need to use a program to control a mplayer.
I want mplayer plays movies, and when some event is coming,  it is required to play MP3. ( movies have to keep playing).

My question is,
1. After I use popen("mplayer -slave filename","w") to start mplayer . How can I send a command to mplayer
(I don't know how to let my program send command into mplayer as its stdin)

2. When I try to play MP3 and Movie together, the system shows " Device is busy and unavaiable". (even I make movie to be mute)
Is there any possibility I can play the sound of movie and MP3 together?

Thanks,
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