title: How to create an h264 video with an alpha channel for use with HTML5 Canvas?
body: <p>I've been interested in this demo: <a href="http://jakearchibald.com/scratch/alphavid/" rel="nofollow noreferrer">http://jakearchibald.com/scratch/alphavid/</a></p>
  
  <p>I also saw this question on here:</p>
  
  <p><a href="https://stackoverflow.com/questions/4073303/can-i-have-a-video-with-transparent-background-using-html5-video-tag">Can I have a video with transparent background using HTML5 video tag?</a></p>
  
  <p>But I can't seem to figure out: How do you create h264, ogg and webm video files with alpha channels?</p>