SoundSDL2 freezes when loading audio

[pe7ro]

Software Versions

• Python: 3.13.2
• OS:Linux 6.12.17-amd64
• Kivy: 2.3.1
• Kivy installation method: apt

Describe the bug kivy.core.audio.audio_sdl2.SoundSDL2 freezes when trying to load '.oga' audio after UI is shown

Expected behavior Either of the following:

• the sound is loaded
• an exception is thrown
• a warning is logged and None is returned

To Reproduce

Code and Logs and screenshots

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.core.audio import SoundLoader

class PongApp(App):
    def build(self):
        Clock.schedule_interval(self.update, 1)
        return Widget()

    def update(self, dt):
        self.sound = SoundLoader.load('/usr/share/sounds/freedesktop/stereo/service-login.oga')
        exit()

if __name__ == '__main__':
    PongApp().run()

Additional context At the same time the following code logs a warning and sets sound to None.

from kivy.core.audio import SoundLoader

sound = SoundLoader.load('/usr/share/sounds/freedesktop/stereo/service-login.oga')

[INFO   ] [Audio       ] Providers: audio_gstplayer, audio_sdl2 (audio_ffpyplayer ignored)
[WARNING] [Audio       ] Unable to find a loader for </usr/share/sounds/freedesktop/stereo/service-login.oga>

Sidenote: Using SoundGstplayer in both cases load the audio correctly.

from kivy.core.audio.audio_gstplayer import SoundGstplayer

sound = SoundGstplayer(source='/usr/share/sounds/freedesktop/stereo/service-login.oga')

[spinningD20]

I've run into this as well, but wasn't able to narrow it down this far. Thanks @pe7ro !

All I knew was that my kivy app (game) was freezing completely at some point, if I used a python variant of 3.13 (3.10, 3.11, 3.12 are fine).

It's definitely something with SoundLoader. Commenting out its usage, 3.13 no longer freezes.

I figured I'd chime in to specify it's definitely not an issue with versions of python prior to 3.13.

[nobu1308]

I can confirm that the code above freezes when run. (Note: I added from kivy.clock import Clock to the imports)

Python: 3.12.3 OS: Ubuntu 24.04 (kernel 6.8.8) Kivy: 2.3.1

The code works correctly (exits normally) with Kivy 2.3.0. (pip install kivy==2.3.0) Original application context: https://github.com/sanderland/katrain/issues/773

[lyskouski]

It (SoundLoader.load) freezes on Windows with Kivy 2.3.0

Python: 3.12.2
OS: Windows 11
Kivy: 2.3.0

Workaround:

if platform.system() == 'Windows':
    from kivy.core.audio.audio_sdl2 import MusicSDL2
else:
    from kivy.core.audio import SoundLoader
#...
    def play():
            if platform.system() == 'Windows':
                sound = MusicSDL2(source=path)
            else:
                sound = SoundLoader.load(path)
            Clock.schedule_once(lambda dt: sound.play(), 0)