title: Unrecognized option 'c copy'
body: <p>I have been working on a script as a part of both learning process and creating handy tools. I am trying to loop over a list of video files to extract a certain part of each video on the list. By looking at example scripts and ffmpeg documentation I finally came up with this:</p>
  
  <pre><code>import os
  import sys
  import subprocess as sp
  
  from moviepy.tools import subprocess_call
  
  def ffmpeg_extract_pandomim_subclip():
  
      with open('videolist.txt') as f:
          lines = f.readlines()
      lines = [x.strip() for x in lines]
  
      for video in lines:
          name, ext = os.path.splitext(video)
          targetname = "%s-pandomim%s" % (name, ext)
          t1 = "00:10:00"
          t2 = "00:15:00"
          cmd = ["ffmpeg",
                 "-i", "%s%s" % (name, ext),
                 "-ss", t1,
                 "-to", t2, "-c copy", targetname]
  
          subprocess_call(cmd)
  
  ffmpeg_extract_pandomim_subclip()
  </code></pre>
  
  <p>I know this is not the ideal way to do it: I created a videolist.txt and listed all the video file names in that txt file, line by line,(T1-1.mp4, T1-2.mp4,... ) that share the same folder with the python script "new 1.py" and the actual videos which are T1-1.mp4, T1-2.mp4,... </p>
  
  <p>The error I am getting really confuses me because when I use -c copy from cmd it works just fine. </p>
  
  <p>The full error is:</p>
  
  <pre><code>C:\Users\çomak\AppData\Local\Programs\Python\Python35-32\python.exe "C:/ffmpeg/bin/new 1.py"
  
  [MoviePy] Running:
  &gt;&gt;&gt; ffmpeg -i T1-1.mp4 -ss 00:10:00 -to 00:15:00 -c copy T1-1-pandomim.mp4
  [MoviePy] This command returned an error !Traceback (most recent call last):
    File "C:/ffmpeg/bin/new 1.py", line 28, in &lt;module&gt;
      ffmpeg_extract_pandomim_subclip()
    File "C:/ffmpeg/bin/new 1.py", line 25, in ffmpeg_extract_pandomim_subclip
      subprocess_call(cmd)
    File "C:\Users\çomak\AppData\Local\Programs\Python\Python35-32\lib\site-packages\moviepy\tools.py", line 48, in subprocess_call
      raise IOError(err.decode('utf8'))
  OSError: ffmpeg version N-83975-g6c4665d Copyright (c) 2000-2017 the FFmpeg developers
    built with gcc 6.3.0 (GCC)
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
    libavutil      55. 48.100 / 55. 48.100
    libavcodec     57. 83.100 / 57. 83.100
    libavformat    57. 66.104 / 57. 66.104
    libavdevice    57.  3.100 / 57.  3.100
    libavfilter     6. 76.100 /  6. 76.100
    libswscale      4.  3.101 /  4.  3.101
    libswresample   2.  4.100 /  2.  4.100
    libpostproc    54.  2.100 / 54.  2.100
  Unrecognized option 'c copy'.
  Error splitting the argument list: Option not found
  
  
  Process finished with exit code 1
  </code></pre>
  
  <p>I am using Pycharm and if I remove the -c copy part it works, but the process is slow... With -c copy, it is much faster.</p>
  
  <p>I appreciate your time and effort to help me out!</p>