title: Using PHP to convert video files to mp4, flv, webgl, webm, ogv, etc
body: <p>are there any functions or scripts available that allows for a video (either in a folder or on upload) to be converted to different filytypes so that they may be viewed in all types of systems?</p>
  
  <p>I know youtube does this so that HTML5 compatible browsers don't watch flash versions of the files. </p>
  
  <p>Where do I start learning this?</p>