<html>
<head>
<title>video example</title>
</head>

<body>
    <video id="myVideo" height="400" width="400" autoplay onended="run();">   
        <source id="ss"  src="video/video1.mp4" type='video/mp4'>
    </video>

    <script>
        video_count =1;
        videoPlayer = document.getElementById("ss");        
        video=document.getElementById("myVideo");

        function run(){
            video_count++;
            if (video_count == 4) video_count = 1;
            videoPlayer.setAttribute("src","video/video"+video_count+".mp4");       
            video.play();

       }

    </script>
</body>
</html>