Python speech recognition error - Invalid number of channels

Question

I'm running a speech recognition code on python as part of a project. I'm facing a really odd kind of a problem When I put the speech recognition code inside a function like:

def loop():
    r=sr.Recognizer()
    with sr.Microphone(device_index=2) as source:
            print("say something")
            audio = r.listen(source)
            try:
                    print("you said "+r.recognize_google(audio))
            except sr.UnknownValueError:
                    print("Could not understand")
            except sr.RequestError as e:
                    print("errpr: {0}".format(e))

It gives me the following error:

with sr.Microphone(device_index=2) as source: File "/usr/local/lib/python3.5/dist-packages/speech_recognition/init.py", line 141, in enter input=True, # stream is an input stream File "/usr/local/lib/python3.5/dist-packages/pyaudio.py", line 750, in open stream = Stream(self, *args, **kwargs) File "/usr/local/lib/python3.5/dist-packages/pyaudio.py", line 441, in init self._stream = pa.open(**arguments) OSError: [Errno -9998] Invalid number of channels

But if I run the same lines of code outside the function like not inside the def loop(): it runs properly

What should I do? My python version is 3.5.4

removing the device_index made it work for me with sr.Microphone() as source: — ClumsyPuffin
It works without error but it gets stuck at r.listen(audio) for which I couldn't find solutions that worked — RishiC
you have to speak something at the "say something" prompt or else it will be stuck — ClumsyPuffin

Daniel Kukiela Daniel Kukiela · Accepted Answer · 2018-06-20T17:26:11

Try that way:

r = sr.Recognizer()
m = sr.Microphone(device_index=2)

def loop():
    with m as source:
        print("say something")
        audio = r.listen(source)
        try:
            print("you said "+r.recognize_google(audio))
        except sr.UnknownValueError:
            print("Could not understand")
        except sr.RequestError as e:
            print("errpr: {0}".format(e))

loop()

Don't create multiple Microphone() instances.

Python speech recognition error - Invalid number of channels

2 Answers