这段的目的是给ffmpeg拼接参数，然后跑ffmpeg输出音频文件。照着网上的案例抄的，结果报错。网上多方查询未果，求大佬指点！

    cmd = 'ffmpeg'
    cmd += ' -y'
    cmd += ' -i "%s"' % os.path.join(target_dir, target_file)
    cmd += ' -vn'
    cmd += ' -ss %.2d:%.2d:%.2d' % (track['start'] / 60 / 60, track['start'] / 60 % 60, int(track['start'] % 60))
    if 'duration' in track:
        cmd += ' -t %.2d:%.2d:%.2d' % (track['duration'] / 60 / 60, track['duration'] / 60 % 60, int(track['duration'] % 60))
    cmd += ' ' + ' '.join('-metadata %s="%s"' % (k, v) for (k, v) in metadata.items())
    #cmd += ' "%.2d - %s - %s.mp3"' % (track['track'], track['artist'], track['title'])
    cmd += ' -acodec ac3'
    cmd += ' "%s.ac3"' % (track['title'])
#以上是拼接参数
      import shlex, subprocess
      print(cmd)
#此处print出来的字符串正常
#下一行报错AttributeError: 'bytes' object has no attribute 'read'，全部报错信息附后
      args = shlex.split(cmd.encode("utf-8"))
      p = subprocess.Popen(args)
      p.wait()


全部报错信息：
Traceback (most recent call last):
  File "C:\Users\fjiang\Desktop\split-cuesheet2ac3.py", line 93, in <module>
    args = shlex.split(cmd.encode("utf-8"))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\fjiang\AppData\Local\Programs\Python\Python311\Lib\shlex.py", line 315, in split
    return list(lex)
           ^^^^^^^^^
  File "C:\Users\fjiang\AppData\Local\Programs\Python\Python311\Lib\shlex.py", line 300, in __next__
    token = self.get_token()
            ^^^^^^^^^^^^^^^^
  File "C:\Users\fjiang\AppData\Local\Programs\Python\Python311\Lib\shlex.py", line 109, in get_token
    raw = self.read_token()
          ^^^^^^^^^^^^^^^^^
  File "C:\Users\fjiang\AppData\Local\Programs\Python\Python311\Lib\shlex.py", line 140, in read_token
    nextchar = self.instream.read(1)
               ^^^^^^^^^^^^^^^^^^
AttributeError: 'bytes' object has no attribute 'read'
--
修改:Osram FROM 111.8.143.*
FROM 111.8.143.*