This is an example MLT filter implemented in HTML. It renders the video into an HTML canvas with a circle clip applied. The rendered video can be viewed here demo/mlt/mlt_filter_demo_html.
<html>
<head>
<style type="text/css">
html, body {
width: 100%;
height: 100%;
margin: 0;
}
</style>
<script type="text/javascript">
function Filter() {
var canvas = document.createElement('canvas');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
document.body.appendChild(canvas);
this.context = canvas.getContext('2d');
var radius = webvfx.getNumberParameter("radius");
if (!radius)
radius = 0.5;
this.context.beginPath();
this.context.arc(canvas.width/2, canvas.height/2,
canvas.height * radius, 0, Math.PI*2, true)
this.context.clip();
this.image = new Image();
}
Filter.prototype.render = function(time) {
webvfx.getImage("video").assignToHTMLImageElement(this.image);
this.context.drawImage(this.image, 0, 0);
}
function init() {
var filter = new Filter();
webvfx.renderRequested.connect(filter, Filter.prototype.render);
webvfx.imageTypeMap = { "video" : webvfx.SourceImageType };
webvfx.readyRender(true);
}
window.addEventListener("load", init, false);
</script>
</head>
<body>
</body>
</html>
