[Question] Issue of Invalid output device when using pyaudio in VAD inference
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@fayejf 
Hi,
I have implemented a code for using the Marble_Net VAD model according to the below tutorial:
[Online_Offline_Microphone_VAD_Demo](https://github.com/NVIDIA/NeMo/blob/stable/tutorials/asr/Online_Offline_Microphone_VAD_Demo.ipynb)  
But I got the following error (I have tested it on Colab and two other servers):
```
OSError: [Errno -9996] Invalid output device (no default output device)
```
How can I address it? (I have searched the error and examined some solutions, but none of them worked. The issue related to the `pyaudio` library)
Would you please guide me that how can I remove the `pyaudio library` and use the VAD model for inferencing just a mono-channel 16Khz audio file in HDD? 
