为Google Speech API创建合适的WAV文件

我正在使用pyaudio将我的声音录制为wav文件.我正在使用以下代码:

def voice_recorder():
    FORMAT = pyaudio.paInt16
    CHANNELS = 2
    RATE = 22050
    CHUNK = 1024
    RECORD_SECONDS = 4
    WAVE_OUTPUT_FILENAME = "first.wav"

    audio = pyaudio.PyAudio()

    # start Recording
    stream = audio.open(format=FORMAT, channels=CHANNELS,
                    rate=RATE, input=True,
                    frames_per_buffer=CHUNK)
    print "konusun..."
    frames = []

    for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
        data = stream.read(CHUNK)
        frames.append(data)
    #print "finished recording"


    # stop Recording
    stream.stop_stream()
    stream.close()
    audio.terminate()

    waveFile = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
    waveFile.setnchannels(CHANNELS)
    waveFile.setsampwidth(audio.get_sample_size(FORMAT))
    waveFile.setframerate(RATE)
    waveFile.writeframes(b''.join(frames))
    waveFile.close()

我正在使用以下Google Speech API代码,它基本上将WAV文件中的语音转换为文本:https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/speech/api-client/transcribe. PY

当我尝试将由pyaudio生成的wav文件导入Google的代码时,我收到以下错误:

googleapiclient.errors.HttpError: 

我正在使用以下解决方法:我正在使用ffmpeg将WAV文件转换为MP3,之后我将使用sox将MP3文件转换为wav:

def wav_to_mp3():
    FNULL = open(os.devnull, 'w')
    subprocess.call(['ffmpeg', '-i', 'first.wav', '-ac', '1', '-ab', '6400', '-ar', '16000', 'second.mp3', '-y'], stdout=FNULL, stderr=subprocess.STDOUT)

def mp3_to_wav():
    subprocess.call(['sox', 'second.mp3', '-r', '16000', 'son.wav'])

Google的API与此WAV输出配合使用,但由于质量下降过多,因此效果不佳.

那么如何在第一步创建与pyaudio兼容的WAV文件呢？

使用avconv将wav文件转换为flac文件并将其发送到Google Speech API解决了该问题

subprocess.call(['avconv', '-i', 'first.wav', '-y', '-ar', '48000', '-ac', '1', 'last.flac'])