title: Moviepy - video will not export with the audio I add to it
body: <pre><code>from moviepy.editor import *
  
  
  clip = VideoFileClip('add_audio.mp4')
  
  audio = AudioFileClip('liver_1.wav')
  
  videoclip = clip.set_audio(audio)
  
  clip.write_videofile('does this work.mp4')
  </code></pre>
  <p>Please help, when I run this code the video exports but with no audio. I've tried many different formations of this with slightly different functions and still nothing works. I have yet to find someone with this issue.</p>