如何从Sitecore媒体项目中检索视频详细信息？

在这里，我正在网站中实施视频站点地图，并且试图在sitecore中获取视频的详细信息。我可以阅读标题，说明等详细信息。但是如何获取以下详细信息，例如持续时间，播放器位置以及以下XML中提到的其他详细信息

<video:video>
       <video:thumbnail_loc>http://www.example.com/thumbs/123.jpg</video:thumbnail_loc> 
       <video:title>Grilling steaks for summer</video:title>
       <video:description>Alkis shows you how to get perfectly done steaks every            
         time</video:description>
       <video:content_loc>http://www.example.com/video123.flv</video:content_loc>
       <video:player_loc allow_embed="yes" autoplay="ap=1">
         http://www.example.com/videoplayer.swf?video=123</video:player_loc>
       <video:duration>600</video:duration>
       <video:expiration_date>2009-11-05T19:20:30+08:00</video:expiration_date>
       <video:rating>4.2</video:rating> 
       <video:view_count>12345</video:view_count>    
       <video:publication_date>2007-11-05T19:20:30+08:00</video:publication_date>
       <video:family_friendly>yes</video:family_friendly>   
       <video:restriction relationship="allow">IE GB US CA</video:restriction> 
       <video:gallery_loc title="Cooking Videos">http://cooking.example.com</video:gallery_loc>
       <video:price currency="EUR">1.99</video:price>
       <video:requires_subscription>yes</video:requires_subscription>
       <video:uploader info="http://www.example.com/users/grillymcgrillerson">GrillyMcGrillerson
         </video:uploader>
       <video:live>no</video:live>
     </video:video> 

这是我的代码：

HtmlAgilityPack.HtmlDocument document = htmlWeb.Load("http://www.example.com/us/cars/new-models/xc60");
var urls = document.DocumentNode.Descendants("source")
           .Select(x => x.Attributes[1].Value).ToList();
DynamicLink dynamicLink;
_videoval = new Videodetails();
foreach (var singleurl in urls)
    {
      if (!DynamicLink.TryParse(singleurl, out dynamicLink))
      return;
      MediaItem mediaItem = Sitecore.Context.Database.GetItem(dynamicLink.ItemId, dynamicLink.Language ?? Sitecore.Context.Language);
      var videodetail = new Videodetails() { Title = mediaItem.Title,Description = mediaItem.Description };
      videolist.Add(videodetail);
    }