Merge pull request #13262 from gnattu/don't-use-x265-params-on-ultrafast

Don't use custom params on ultrafast x265 preset

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -2061,7 +2061,13 @@ namespace MediaBrowser.Controller.MediaEncoding
                 // 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.
-                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";
+                param += " -x265-params:0 no-scenecut=1:no-open-gop=1:no-info=1";
+
+                if (encodingOptions.EncoderPreset < EncoderPreset.ultrafast)
+                {
+                    // The following params are slower than the ultrafast preset, don't use when ultrafast is selected.
+                    param += ":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";
+                }
             }
 
             if (string.Equals(videoEncoder, "libsvtav1", StringComparison.OrdinalIgnoreCase)