Pygame mixer in a subprocess does not work

Asked Apr 10 '13 at 12:38

Active Apr 10 '13 at 12:46

Viewed 402 times

Debian OS. I call a subprocess

subprocess.Popen([sys.executable, "/home/pi/play_sound.py"])

And in play_sound.py, I play a sound with:

def load_sound(url):
    class NoneSound:
        def play(self): pass
    if not pygame.mixer or not pygame.mixer.get_init():
        return NoneSound()
    fullname = url
    try:
        sound = pygame.mixer.Sound(fullname)
    except pygame.error, message:
        print 'Cannot load sound:', fullname
        raise SystemExit, message
    return sound

The problem is that when I run play_sound.py separately, it works fine. But when I call it as a subprocess of another py file, it does not play the sound.

edited Apr 10 '13 at 12:46

mata

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asked Apr 10 '13 at 12:38

Hoang-Long Cao

any error messages? the file might not be seen, when launching it from another process – Bartlomiej Lewandowski Apr 10 '13 at 12:47
2

why not `import play_sound` and then just call `load_sound` whenever you need to? – mgilson Apr 10 '13 at 12:48
Maybe the parent process also initializes the mixer, and you cannot have two processes with the mixer at once? – Armin Rigo Apr 10 '13 at 14:24
No error at all. play_sound is a GUI that plays many sounds depending on the keyboard input. So I can't just simply import it in the main.py file. – Hoang-Long Cao Apr 10 '13 at 14:37
Does `from pygame.locals import *` also import mixer? How can we "export" it out of the program? – Hoang-Long Cao Apr 10 '13 at 15:55
Everything does work in Windows but not in Debian :( – Hoang-Long Cao Apr 10 '13 at 17:01
1

I solved it. We need to initialize `pygame.mixer.init()` then quit it before calling the subprocess `pygame.mixer.quit()`. – Hoang-Long Cao Apr 10 '13 at 22:18
Answering a side question: from pygame.locals import * does not import mixer. from pygame import * does, but it does not initiate pygame.mixer. – ndvo Jul 12 '13 at 20:45

Pygame mixer in a subprocess does not work

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