add ForceLiveStream option

MediaBrowser.Model/Dlna/TranscodingProfile.cs

@@ -35,6 +35,9 @@ namespace MediaBrowser.Model.Dlna
         [XmlAttribute("context")]
         public EncodingContext Context { get; set; }
 
+        [XmlAttribute("forceLiveStream")]
+        public bool ForceLiveStream { get; set; }
+
         public List<string> GetAudioCodecs()
         {
             List<string> list = new List<string>();