Python捕获子流程输出

Question

I'm working on a tensorflow project that learns from an audio stream. I'm using the subprocess module (with Popen ) and FFMPEG to read in the audio data from an mp3. I successfully open the audio file with Popen() and I can print the output through stdout . However, I can't seem to capture it.

I have tried both read() and communicate()

I'm following a tutorial here

read() simply returns nothing and communicate() throws the error: AttributeError: 'file' object has no attribute 'communicate'

Here's my code:

for image_index, image in enumerate(image_files):
  count += 1
  image_file = os.path.join(folder, image)
  try:
    output_files = "output/output" + str(count) + ".png"
    if image_file != 'train/rock/.DS_Store':
        command = [FFMPEG_BIN,
            '-i', image_file,
            '-f', 's16le',
            '-acodec', 'pcm_s16le',
            '-ar', '44100',
            '-ac', '2',
            output_files]
        pipe = sp.Popen(command, stdout=sp.PIPE)
        print (pipe)
        raw_audio = pipe.stdout.communicate(88200*4)

I've tried everything here and here

Answer 1

The Popen object has communicate not stdout :

pipe.communicate(str(88200*4))

To also capture stderr through stdout:

 pipe = sp.Popen(command, stdout=sp.PIPE, stderr=sp.STDOUT, stdin=sp.PIPE)
 raw_audio, _  = pipe.communicate(str(88200*4).encode())
 print(raw_audio)