diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index 9399679a4f..61693e33c0 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -2056,11 +2056,12 @@ namespace MediaBrowser.Controller.MediaEncoding
                 param += " -x264opts:0 subme=0:me_range=16:rc_lookahead=10:me=hex:open_gop=0";
             }
 
-            if (string.Equals(videoEncoder, "libx265", StringComparison.OrdinalIgnoreCase))
+            if (string.Equals(videoEncoder, "libx265", StringComparison.OrdinalIgnoreCase) && encodingOptions.EncoderPreset < EncoderPreset.ultrafast)
             {
                 // libx265 only accept level option in -x265-params.
                 // level option may cause libx265 to fail.
                 // libx265 cannot adjust the given level, just throw an error.
+                // The following params are slower than the ultrafast preset, don't use when ultrafast is selected.
                 param += " -x265-params:0 subme=3:merange=25:rc-lookahead=10:me=star:ctu=32:max-tu-size=32:min-cu-size=16:rskip=2:rskip-edge-threshold=2:no-sao=1:no-strong-intra-smoothing=1:no-scenecut=1:no-open-gop=1:no-info=1";
             }