title: Concatenation two Video clip
body: <p>I'm trying to concatenate two video clips with the following code:</p>
  
  <pre><code>import moviepy
  import os
  from moviepy.editor import VideoFileClip, concatenate_videoclips
  file1 = 'IMG_3591.MOV'
  file2 = 'IMG_3592.MOV'
  final_clip = concatenate_videoclips([file1,file2],method="compose")
  final_clip.write_videofile("my_concatenation.mp4")
  </code></pre>
  
  <p>However, I'm getting the  following error:</p>
  
  <blockquote>
    <p>AttributeError: 'str' object has no attribute 'duration'</p>
  </blockquote>
  
  <p>What am I doing wrong?</p>