update resizing params

MediaBrowser.Api/Playback/BaseStreamingService.cs

@@ -547,7 +547,7 @@ namespace MediaBrowser.Api.Playback
             {
                 var heightParam = request.Height.Value.ToString(UsCulture);
 
-                filters.Add(string.Format("scale=trunc(oh*a*2)/2:{0}", heightParam));
+                filters.Add(string.Format("scale=trunc(oh*a/2)*2:{0}", heightParam));
             }
 
             // If a max width was requested
@@ -555,7 +555,7 @@ namespace MediaBrowser.Api.Playback
             {
                 var maxWidthParam = request.MaxWidth.Value.ToString(UsCulture);
 
-                filters.Add(string.Format("scale=min(iw\\,{0}):trunc(ow/dar/2)*2", maxWidthParam));
+                filters.Add(string.Format("scale=trunc(min(max(iw\\,ih*dar)\\,{0})/2)*2:trunc(ow/dar/2)*2", maxWidthParam));
             }
 
             // If a max height was requested