fix subtitle position after seek in chrome

dashboard-ui/scripts/htmlmediarenderer.js

@@ -522,10 +522,11 @@
 
                 // Safari uses integers for the mode property
                 // http://www.jwplayer.com/html5/scripting/
+                // edit: not anymore
                 var useNumericMode = false;
 
                 if (!isNaN(allTracks[i].mode)) {
-                    useNumericMode = true;
+                    //useNumericMode = true;
                 }
 
                 if (useNumericMode) {

dashboard-ui/scripts/mediaplayer.js

@@ -705,7 +705,10 @@
                                 if (mediaUrl.indexOf('.mkv') == -1) {
                                     mediaUrl += '&EnableAutoStreamCopy=false';
                                 }
-                                startTimeTicksOffset = startPosition || 0;
+
+                                if (mediaUrl.toLowerCase().indexOf('copytimestamps=true') == -1) {
+                                    startTimeTicksOffset = startPosition || 0;
+                                }
 
                                 contentType = 'video/' + mediaSource.TranscodingContainer;
                             }