Python 捕获子进程输出 [英] Python capture subprocess output

问题描述

我正在研究一个从音频流中学习的 tensorflow 项目.我正在使用子进程模块(带有 Popen)和 FFMPEG 从 mp3 中读取音频数据.我使用 Popen() 成功打开了音频文件，并且可以通过 stdout 打印输出.但是，我似乎无法捕捉到它.

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.

我已经尝试了 read() 和 communicate()

I have tried both read() and communicate()

我正在学习教程 这里

read() 不返回任何内容，communicate() 抛出错误:AttributeError: 'file' object has no attribute 'communicate'

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

这是我的代码:

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)

我已经尝试了所有这里和这里

推荐答案

Popen 对象已与 stdout 通信:

pipe.communicate(str(88200*4))

还要通过标准输出捕获标准错误:

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)

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