title: WordPress: Media error: Format(s) not supported or source(s) not found
body: <p>I'm trying to add a MP4 video to my media library. It doesn't give any error but when I try to play the video it gives this message inside the video player:</p>
  <blockquote>
  <p>Media error: Format(s) not supported or source(s) not found</p>
  </blockquote>
  <p>The video size is 2MB.</p>