Issue on Pyaudio_Test.ipynb

[blinkomaniak]

These lines:

stream = p.open(format=p.get_format_from_width(wf.getsampwidth()), channels=wf.getnchannels(), rate=wf.getframerate(), output=True, stream_callback=callback)

produces this error:

---

OSError Traceback (most recent call last)
in
3 rate=wf.getframerate(),
4 output=True,
----> 5 stream_callback=callback)

~/anaconda3/lib/python3.7/site-packages/pyaudio.py in open(self, *args, **kwargs)
748 """
749
--> 750 stream = Stream(self, *args, **kwargs)
751 self._streams.add(stream)
752 return stream

~/anaconda3/lib/python3.7/site-packages/pyaudio.py in init(self, PA_manager, rate, channels, format, input, output, input_device_index, output_device_index, frames_per_buffer, start, input_host_api_specific_stream_info, output_host_api_specific_stream_info, stream_callback)
439
440 # calling pa.open returns a stream object
--> 441 self._stream = pa.open(**arguments)
442
443 self._input_latency = self._stream.inputLatency

OSError: [Errno -9996] Invalid output device (no default output device)

What migth be the cause?
Thanks

[mwickert]

Blinkomaniak, To me it looks like you may have not specified a proper input and/or output device. If you are on Windows the device listing is fairly extensive. On macOS the listing is very short. I have a variety of course project that have sample Jupyter notebooks that begin with a checkout of the pyaudio_helper interface. Some samples are also included in the GitHub repo. Consider this https://scikit-dsp-comm.readthedocs.io/en/latest/nb_examples/Real-Time-DSP_Using_pyaudio_helper_and_ipywidgets.html example notebook. This IPYNB document is under docs/source/nb_examples/. On a Win10 machine for example you might see: [cid:image001.png@01D59E5C.DE0F1D50] In this scenario I pick 1 as the input device index and 3 as the output device index: [cid:image002.png@01D59E5C.DE0F1D50] Other recent examples can be found at http://www.eas.uccs.edu/~mwickert/ece5650/notes/Python_Projects/Project1_f2019.zip and http://www.eas.uccs.edu/~mwickert/ece4680/lecture_notes/Audio_Record_Playback.zip . Mark Wickert From: blinkomaniak <notifications@github.com> Sent: Saturday, November 16, 2019 11:00 PM To: mwickert/SP-Comm-Tutorial-using-scikit-dsp-comm <SP-Comm-Tutorial-using-scikit-dsp-comm@noreply.github.com> Cc: Subscribed <subscribed@noreply.github.com> Subject: [mwickert/SP-Comm-Tutorial-using-scikit-dsp-comm] Issue on Pyaudio_Test.ipynb (#1) This lines: stream = p.open(format=p.get_format_from_width(wf.getsampwidth()), channels=wf.getnchannels(), rate=wf.getframerate(), output=True, stream_callback=callback) produces this error:

…

________________________________ OSError Traceback (most recent call last) in 3 rate=wf.getframerate(), 4 output=True, ----> 5 stream_callback=callback) ~/anaconda3/lib/python3.7/site-packages/pyaudio.py in open(self, *args, **kwargs) 748 """ 749 --> 750 stream = Stream(self, *args, **kwargs) 751 self._streams.add(stream) 752 return stream ~/anaconda3/lib/python3.7/site-packages/pyaudio.py in init(self, PA_manager, rate, channels, format, input, output, input_device_index, output_device_index, frames_per_buffer, start, input_host_api_specific_stream_info, output_host_api_specific_stream_info, stream_callback) 439 440 # calling pa.open returns a stream object --> 441 self._stream = pa.open(**arguments) 442 443 self._input_latency = self._stream.inputLatency OSError: [Errno -9996] Invalid output device (no default output device) What migth be the cause? Thanks — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<#1?email_source=notifications&email_token=AC74UBWE4NXTHUUC3QR2LMLQUDMWTA5CNFSM4JOIL6JKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4HZ2W2EA>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AC74UBQKCZ5IRDBSOZ6ZTULQUDMWTANCNFSM4JOIL6JA>.