Detect when an HTML5 video finishes

You can add an event listener with 'ended' as first param

Like this :

<video src="video.ogv" id="myVideo">
  video not supported
</video>

<script type='text/javascript'>
    document.getElementById('myVideo').addEventListener('ended',myHandler,false);
    function myHandler(e) {
        // What you want to do after the event
    }
</script>

Have a look at this Everything You Need to Know About HTML5 Video and Audio post at the Opera Dev site under the "I want to roll my own controls" section.

This is the pertinent section:

<video src="video.ogv">
     video not supported
</video>

then you can use:

<script>
    var video = document.getElementsByTagName('video')[0];

    video.onended = function(e) {
      /*Do things here!*/
    };
</script>

onended is a HTML5 standard event on all media elements, see the HTML5 media element (video/audio) events documentation.

JQUERY

$("#video1").bind("ended", function() {
   //TO DO: Your code goes here...
});

HTML

<video id="video1" width="420">
  <source src="path/filename.mp4" type="video/mp4">
  Your browser does not support HTML5 video.
</video>

Event types HTML Audio and Video DOM Reference