python3 使用pyaudio OSError: [Errno -9996] Invalid input device (no default output device)-ubuntu16.04

程序的代码是：

#encoding:utf8
import pyaudio,wave

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "output.wav"


p = pyaudio.PyAudio()

stream = p.open(format=FORMAT,
                channels=CHANNELS,
                rate=RATE,
                input=True,
                frames_per_buffer=CHUNK)

print("* recording")

frames = []

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

print("* done recording")

stream.stop_stream()
stream.close()
p.terminate()

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

出现的问题是：

Traceback (most recent call last):
  File "vad.py", line 68, in <module>
    frames_per_buffer=CHUNK)
  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 -9996] Invalid input device (no default output device)

原因是原来装PortAudio的时候没有装好。
解决办法是重新安装。

卸载

sudo apt remove python-pyaudio python3-pyaudio
sudo apt autoremove

安装PortAudio

下载PortAudio

从网站http://www.portaudio.com/download.html下载pa_stable_v190600_20161030.tgz文件。

安装

解压下载的压缩包，进入其中

Installing ALSA Development Kit

参考网页http://portaudio.com/docs/v19-doxydocs/compile_linux.html

sudo apt install libasound-dev#一定要有这一句，这是解决问题的关键
./configure
make
sudo make install

安装pyaudio

sudo apt install python-pyaudio python3-pyaudio

重新运行上述的程序，问题解决。
以上。