improve video aspect

www/js/beauty.js

@@ -269,12 +269,13 @@ if ($('#my-player').length > 0 && typeof(videojs) != 'undefined') {
     myPlayer.one('play', function() {
         myPlayer.pause();
 
+        var height = myPlayer.videoHeight(), width = myPlayer.videoWidth(),
+            aspect = height / width;
         var canvas = document.createElement('canvas');
         var video = $('video.vjs-tech').get(0);
 
-        //360p
-        canvas.width = 640;
-        canvas.height = 360;
+        canvas.width = Math.ceil(360/aspect);
+        canvas.height = 360;    //360p
 
         var ctx = canvas.getContext('2d');
         ctx.drawImage( video, 0, 0, canvas.width, canvas.height );