Sound file not playing in PySide app after PyInstaller - pyqt

Question

In my PySide app, I use the following bit of code to play a wav file:
media = Phonon.MediaObject()
audio = Phonon.AudioOutput(Phonon.MusicCategory)
Phonon.createPath(media, audio)
alarm_file = 'alarm_beep.wav'
f = QtCore.QFile(alarm_file)
if f.exists():
source = Phonon.MediaSource(alarm_file)
if source.type() != -1: # -1 stands for invalid file
media.setCurrentSource(source)
media.play()
else:
logger.debug('Alert media missing: %s' % alarm_file)
This works fine in Ubuntu when I run the Python script but when I compile the app to an exe with Pyinstaller for windows, the sound is not played.
I use the following pyinstaller command
pyinstaller --onefile --add-data "alarm_beep.wav;." main.py
to attempt to add the media file, but it's to no avail.
The exception in the console is
WARNING: bool __cdecl Phonon::FactoryPrivate::createBackend(void) phonon backend plugin could not be loaded
WARNING: bool __cdecl Phonon::FactoryPrivate::createBackend(void) phonon backend plugin could not be loaded
WARNING: bool __cdecl Phonon::FactoryPrivate::createBackend(void) phonon backend plugin could not be loaded
WARNING: bool __cdecl Phonon::FactoryPrivate::createBackend(void) phonon backend plugin could not be loaded
WARNING: Phonon::createPath: Cannot connect MediaObject ( no objectName ) to AudioOutput ( no objectName ).
Alert media missing: alarm_beep.wav
So obviously it's as if the "alarm_beep.wav" doesn't exist.
Not sure why the add-data command isn't taking care of it?

Answer 1

Once the application in bundled, the external files will be saved in a temporary directory, which you will need to reference. See this post for a discussion on referencing these external files. In short, you will need to update the path to your resource file before referencing it:
#resource_path is the relative path to the resource file, which changes when built for an executable
def resource_path(relative_path):
try:
base_path = sys._MEIPASS
except Exception:
base_path = os.path.abspath('.')
return os.path.join(base_path, relative_path)
and in the body of your code:
alarm_file = resource_path('alarm_beep.wav')