title: Python Popen - command line application not working
body: <p>I am trying to run the below command line application in python, but now getting anywhere. This works perfectly via Terminal on OSX:</p>
  
  <pre><code>/JS/ChannelAssign5+1stereo.app/Contents/MacOS/ChannelAssign5+1stereo "/Volumes/GRAID/_PREVIEWS/MASTER copy.mov"
  </code></pre>
  
  <p>When I try to run the same this via <code>subprocess.Popen</code> the command line application opens but does not run the file MASTER copy.mov.</p>
  
  <pre><code>    command = ['./JS/ChannelAssign5+1stereo.app/Contents/MacOS/ChannelAssign5+1stereo', '%s' % '/Volumes/GRAID/_PREVIEWS/MASTER copy.mov']
      p1 = subprocess.Popen(command)
  </code></pre>
  
  <p>What am I doing wrong?</p>