Error Getting Mac OS X Sound Output

I made the following program in an attempt to try and retrieve all the audio that is being played on my Mac and replay it but everytime I run the code in main.txt, I run across the following output,

Default Devices:

> 0 Built-in Microphone, Core Audio (2 in, 0 out)
< 1 Built-in Output, Core Audio (0 in, 2 out)

Traceback (most recent call last):
  File "main.py", line 15, in <module>
    with sd.Stream(channels=2,dtype="float32",callback=callback):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sounddevice.py", line 1654, in __init__
    **_remove_self(locals()))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sounddevice.py", line 772, in __init__
    'Error opening {0}'.format(self.__class__.__name__))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sounddevice.py", line 2563, in _check
    raise PortAudioError(errormsg, err)
sounddevice.PortAudioError: Error opening Stream: Invalid number of channels [PaErrorCode -9998]

[mgeier]

@khlorghaal Do you mean the message Invalid number of channels?

This message comes directly from the PortAudio library, so we cannot change it.

But we could probably do some additional checks before trying to create the stream. E.g. we could try to call check_input_settings() and check_output_settings(). This way, the error message might contain information whether it’s about “input” or “output” channels. Do you think this would help?

[mgeier]

@khlorghaal I’ve created #242 to address your suggestion, but I’m not sure if it’s a good idea. Please express your opinions over there.