SoundLoader.load crashes in Kivy kv

1 week ago 3

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Kivy SoundLoader.load() crashes (block) if I use KV for UI building, but works fine, when I do widgets in the code. What's the cause? And ho to solve it?

The code, reduced to the load method which blocks everything:

This doesn't work:

my.kv:

#:kivy 1.0.9 MyButton: text: "MyButton"

my.py

from kivy.uix.button import Button from kivy.core.audio import SoundLoader class MyButton(Button): pass class MyApp(App): sound = None def build(self): self.sound = SoundLoader.load('music.mp3') return super().build() if __name__ == '__main__': MyApp().run()

But this works:

my.py:

from kivy.uix.button import Button from kivy.core.audio import SoundLoader class MyApp(App): sound = None def build(self): self.sound = SoundLoader.load('music.mp3') return button if __name__ == '__main__': MyApp().run()

I also traced back where the SoundLoader.load() stops. Soundloader.load() iterates Soundloader._classes as classobj (here: SoundAvplayer) and calls the respective extensions() method to get a list of allowed file extensions. And exactly here inside SoundAvPlayer.extensions() stops the program. Although it only has to return a simple list (or tuple) of strings.

Any idea?