python-通过websockets流音频IBM无法正常工作

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我正在尝试使用IBM Watson通过websockets通过麦克风流式传输音频.我收到以下错误：

TypeError: The system cannot find the file specified

我认为子流程有问题,请帮助我纠正此问题/使其正常工作.

from ws4py.client.threadedclient import WebSocketClient
import base64, json, ssl, subprocess, threading, time

class SpeechToTextClient(WebSocketClient):
    def __init__(self):
        ws_url = "wss://stream.watsonplatform.net/speech-to-text/api/v1/recognize"

        username = "81bffb34-906b-4057-becf-72752e14e756"
        password= "jPwZAMMB5Fwp"
        auth_string = "%s:%s" % (username, password)
        base64string= base64.encodestring(auth_string).replace("\n", "")

        self.listening = False

        try:
            WebSocketClient.__init__(self, ws_url, headers=[("Authorization", "Basic %s" % base64string)])
            self.connect()
        except: print("Failed to open WebSocket.")

    def opened(self):
        self.send('{"action": "start", "content-type": "audio/l16;rate=16000"}')
        self.stream_audio_thread = threading.Thread(target=self.stream_audio)
        self.stream_audio_thread.start()

    def received_message(self, message):
        message = json.loads(str(message))
        if "state" in message:
            if message["state"] == "listening":
                self.listening = True
        print("Message received: " + str(message))

    def stream_audio(self):
        while not self.listening:
            time.sleep(0.1)

        reccmd = ["arecord", "-f", "S16_LE", "-r", "16000", "-t", "raw"]
        p = subprocess.Popen(reccmd, stdout=subprocess.PIPE)

        while self.listening:
            data = p.stdout.read(1024)

            try:
                self.send(bytearray(data), binary=True)
            except ssl.SSLError:
                pass

        p.kill()

    def close_connection(self):
        self.listening = False
        self.stream_audio_thread.join()
        WebSocketClient.close(self)





if __name__ == "__main__":

    SpeechToTextClient()

这是完整的错误输出：

C:\Python27\python.exe C:/Users/vetle/Desktop/testing_ibm.py

Message received: {u'state': u'listening'}
Exception in thread Thread-2:
Traceback (most recent call last):
File "C:\Python27\lib\threading.py", line 801, in __bootstrap_inner
   self.run()
File "C:\Python27\lib\threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "C:/Users/vetle/Desktop/testing_ibm.py", line 38, in stream_audio
p = subprocess.Popen(reccmd, stdout=subprocess.PIPE)
File "C:\Python27\lib\subprocess.py", line 390, in __init__
errread, errwrite)
File "C:\Python27\lib\subprocess.py", line 640, in _execute_child
startupinfo)
WindowsError: [Error 2] The system cannot find the file specified

解决方法:

Arecord是用于在Alsa框架中录制音频的linux工具,它无法在Linux上使用.您需要使用诸如pyaudio之类的东西来录制声音.

   def stream_audio(self):
        while not self.listening:
            time.sleep(0.1)

       p = pyaudio.PyAudio()

       stream = p.open(format=pyaudio.paInt16,
                channels=1, 
                rate=16000, 
                input=True,
                frames_per_buffer=1024)

        while self.listening:
            data = stream.read(2048)

            try:
                self.send(bytearray(data), binary=True)
            except ssl.SSLError:
                pass

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