py.py

work

output = popen("/usr/local/bin/ffprobe -v error -show_format -show_streams %s" % self._audio).read()
for spec in {'sample_rate', 'channels'}:
  eval(u'{0:s} = popen("echo "{0:s}" | grep {0:s}).read().replace("{0:s}=", "").rstrip("\n")'.format(spec))

# sample_rate = popen("echo \"%s\" | grep sample_rate" % output).read().replace("sample_rate=", "").rstrip('\n')
# channels = popen("echo \"%s\" | grep channels" % output).read().replace("channels=", "").rstrip('\n')

  if int(sample_rate) > 16000 or int(channels) > 1:
            filename, extension = self._audio.split('.')
            output_file = ".%s_mono.%s" % (filename, extension)
            system('/usr/local/bin/ffmpeg -y -i %s -out_sample_rate 16000 -ac 1 %s &> /dev/null' % (self._audio, output_file))
            if isfile(output_file):
                self._audio = output_file

            return isfile(output_file)