How to launch two pydub threads in parallel?

Here's the problem:

I want to play two mp3 or mpeg format audio files in parallel using pydub. What I notice is that I can start one thread no problem, but it hangs until the first audio file finishes. Only then does the second file start.

I believe this to be due to the python GIL. So I think the threads will not be able to fire in parallel. Am I correct in thinking this?

Here's a simple version of my code:

from pydub import AudioSegment

from pydub.playback import play

import threading

from threading import Thread

from threading import Event



class Song(Thread):

    def __init__(self, filename):

        """initializes the thread"""

        Thread.__init__(self)

        self.soundfilename = filename

        self._stopper = Event()

        self.setName('SoundThread')



    def run(self):

        """plays a given audio file"""

        song = AudioSegment.from_mp3(self.soundfilename)

        play(song)



    def stop(self):

        self._stopper.set()



if __name__ == '__main__':



    s1 = '01. Born To Kill.mp3'

    s2 = 't1.mpeg'



    music1 = Song(s1)

    music2 = Song(s2)



    music1.run()

    music2.run()

The only work around I discovered on the matter entails taking the mp3, converting it to wave, then feeding it to pyaudio on a thread. That's fine, but it might be computationally expensive for my purposes.

Link for workaround

Thank you!

asked Nov 20 '18 at 10:38

VladMode

You're running the run method in the main thread. The Song thread should be run using the start method.

– Kendas
Nov 20 '18 at 10:40

@Kendas, that makes sense. But that start method ultimately calls start. Or am I missing something?

– VladMode
Nov 20 '18 at 14:27

The start method initializes a new thread and runs the contents of the run method in that thread. calling the run method on its own, runs the instructions in your main thread.

– Kendas
Nov 21 '18 at 8:50

Verified, the behaviour is as you point out. Thank you again @Kendas for your guidance on this.

– VladMode
Nov 21 '18 at 9:57

add a comment |

Here's the problem:

I believe this to be due to the python GIL. So I think the threads will not be able to fire in parallel. Am I correct in thinking this?

Here's a simple version of my code:

from pydub import AudioSegment

from pydub.playback import play

import threading

from threading import Thread

from threading import Event



class Song(Thread):

    def __init__(self, filename):

        """initializes the thread"""

        Thread.__init__(self)

        self.soundfilename = filename

        self._stopper = Event()

        self.setName('SoundThread')



    def run(self):

        """plays a given audio file"""

        song = AudioSegment.from_mp3(self.soundfilename)

        play(song)



    def stop(self):

        self._stopper.set()



if __name__ == '__main__':



    s1 = '01. Born To Kill.mp3'

    s2 = 't1.mpeg'



    music1 = Song(s1)

    music2 = Song(s2)



    music1.run()

    music2.run()

Link for workaround

Thank you!

asked Nov 20 '18 at 10:38

VladMode

You're running the run method in the main thread. The Song thread should be run using the start method.

– Kendas
Nov 20 '18 at 10:40

@Kendas, that makes sense. But that start method ultimately calls start. Or am I missing something?

– VladMode
Nov 20 '18 at 14:27

The start method initializes a new thread and runs the contents of the run method in that thread. calling the run method on its own, runs the instructions in your main thread.

– Kendas
Nov 21 '18 at 8:50

Verified, the behaviour is as you point out. Thank you again @Kendas for your guidance on this.

– VladMode
Nov 21 '18 at 9:57

add a comment |

Here's the problem:

I believe this to be due to the python GIL. So I think the threads will not be able to fire in parallel. Am I correct in thinking this?

Here's a simple version of my code:

from pydub import AudioSegment

from pydub.playback import play

import threading

from threading import Thread

from threading import Event



class Song(Thread):

    def __init__(self, filename):

        """initializes the thread"""

        Thread.__init__(self)

        self.soundfilename = filename

        self._stopper = Event()

        self.setName('SoundThread')



    def run(self):

        """plays a given audio file"""

        song = AudioSegment.from_mp3(self.soundfilename)

        play(song)



    def stop(self):

        self._stopper.set()



if __name__ == '__main__':



    s1 = '01. Born To Kill.mp3'

    s2 = 't1.mpeg'



    music1 = Song(s1)

    music2 = Song(s2)



    music1.run()

    music2.run()

Link for workaround

Thank you!

asked Nov 20 '18 at 10:38

VladMode

Here's the problem:

I believe this to be due to the python GIL. So I think the threads will not be able to fire in parallel. Am I correct in thinking this?

Here's a simple version of my code:

from pydub import AudioSegment

from pydub.playback import play

import threading

from threading import Thread

from threading import Event



class Song(Thread):

    def __init__(self, filename):

        """initializes the thread"""

        Thread.__init__(self)

        self.soundfilename = filename

        self._stopper = Event()

        self.setName('SoundThread')



    def run(self):

        """plays a given audio file"""

        song = AudioSegment.from_mp3(self.soundfilename)

        play(song)



    def stop(self):

        self._stopper.set()



if __name__ == '__main__':



    s1 = '01. Born To Kill.mp3'

    s2 = 't1.mpeg'



    music1 = Song(s1)

    music2 = Song(s2)



    music1.run()

    music2.run()

Link for workaround

Thank you!

python multithreading pyaudio pydub

asked Nov 20 '18 at 10:38

VladMode

asked Nov 20 '18 at 10:38

VladMode

asked Nov 20 '18 at 10:38

VladMode

asked Nov 20 '18 at 10:38

VladMode

asked Nov 20 '18 at 10:38

VladMode

You're running the run method in the main thread. The Song thread should be run using the start method.

– Kendas
Nov 20 '18 at 10:40

@Kendas, that makes sense. But that start method ultimately calls start. Or am I missing something?

– VladMode
Nov 20 '18 at 14:27

The start method initializes a new thread and runs the contents of the run method in that thread. calling the run method on its own, runs the instructions in your main thread.

– Kendas
Nov 21 '18 at 8:50

Verified, the behaviour is as you point out. Thank you again @Kendas for your guidance on this.

– VladMode
Nov 21 '18 at 9:57

add a comment |

You're running the run method in the main thread. The Song thread should be run using the start method.

– Kendas
Nov 20 '18 at 10:40

@Kendas, that makes sense. But that start method ultimately calls start. Or am I missing something?

– VladMode
Nov 20 '18 at 14:27

The start method initializes a new thread and runs the contents of the run method in that thread. calling the run method on its own, runs the instructions in your main thread.

– Kendas
Nov 21 '18 at 8:50

Verified, the behaviour is as you point out. Thank you again @Kendas for your guidance on this.

– VladMode
Nov 21 '18 at 9:57

You're running the run method in the main thread. The Song thread should be run using the start method.

– Kendas
Nov 20 '18 at 10:40

@Kendas, that makes sense. But that start method ultimately calls start. Or am I missing something?

– VladMode
Nov 20 '18 at 14:27

The start method initializes a new thread and runs the contents of the run method in that thread. calling the run method on its own, runs the instructions in your main thread.

– Kendas
Nov 21 '18 at 8:50

Verified, the behaviour is as you point out. Thank you again @Kendas for your guidance on this.

– VladMode
Nov 21 '18 at 9:57

add a comment |

1 Answer
1

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votes

I recommend using pydub with simpleaudio which supports concurrently playing multiple sounds. For a simple example see pydub.playback._play_with_simpleaudio() which you can also just use, if you like.

The main pydub.playback.play() function tries to present the same functionality regardless of which playback method is being used, so it waits for playback to complete, but simpleaudio works fine with concurrent playback (and the _play_with_simpleaudio() function does not wait until the sound finishes playing)

answered Nov 20 '18 at 18:45

Jiaaro

44.8k32135170

Thank you Jiaaro! The solution proposed works.

– VladMode
Nov 21 '18 at 9:53

add a comment |

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1 Answer
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answered Nov 20 '18 at 18:45

Jiaaro

44.8k32135170

Thank you Jiaaro! The solution proposed works.

– VladMode
Nov 21 '18 at 9:53

add a comment |

answered Nov 20 '18 at 18:45

Jiaaro

44.8k32135170

Thank you Jiaaro! The solution proposed works.

– VladMode
Nov 21 '18 at 9:53

add a comment |

answered Nov 20 '18 at 18:45

Jiaaro

44.8k32135170

answered Nov 20 '18 at 18:45

Jiaaro

44.8k32135170

answered Nov 20 '18 at 18:45

Jiaaro

44.8k32135170

answered Nov 20 '18 at 18:45

Jiaaro

44.8k32135170

answered Nov 20 '18 at 18:45

Jiaaro

44.8k32135170

Thank you Jiaaro! The solution proposed works.

– VladMode
Nov 21 '18 at 9:53

add a comment |

Thank you Jiaaro! The solution proposed works.

– VladMode
Nov 21 '18 at 9:53

Thank you Jiaaro! The solution proposed works.

– VladMode
Nov 21 '18 at 9:53

add a comment |

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