Multiple HTML5 Video Source Blob URL Uploading

I am trying video uploading.But first user can preview the video and then upload it.The problem is multiple BLOB Url uploading via ajax and getting file as List HttpPostedFileBase .I am using ASP.NET MVC.

                    var $  source = $  ('#' + id);                     var reader = new FileReader();                     reader.readAsDataURL(this.files[0]);                     reader.onloadend = (function() {                     $  source[0].src = reader.result;                     $  source.parent()[0].load();