Prefer tonemapx during HDR image extraction

Signed-off-by: gnattu <gnattuoc@me.com>

MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs

@@ -708,16 +708,22 @@ namespace MediaBrowser.MediaEncoding.Encoder
                 filters.Add("thumbnail=n=" + (useLargerBatchSize ? "50" : "24"));
             }
 
-            // Use SW tonemap on HDR10/HLG video stream only when the zscale filter is available.
+            // Use SW tonemap on HDR10/HLG video stream only when the zscale or tonemapx filter is available.
             var enableHdrExtraction = false;
 
-            if ((string.Equals(videoStream?.ColorTransfer, "smpte2084", StringComparison.OrdinalIgnoreCase)
+            if (string.Equals(videoStream?.ColorTransfer, "smpte2084", StringComparison.OrdinalIgnoreCase)
                 || string.Equals(videoStream?.ColorTransfer, "arib-std-b67", StringComparison.OrdinalIgnoreCase))
-                && SupportsFilter("zscale"))
             {
-                enableHdrExtraction = true;
-
-                filters.Add("zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0:peak=100,zscale=t=bt709:m=bt709,format=yuv420p");
+                if (SupportsFilter("tonemapx"))
+                {
+                    enableHdrExtraction = true;
+                    filters.Add("tonemapx=tonemap=bt2390:desat=0:peak=100:t=bt709:m=bt709:p=bt709:format=yuv420p");
+                }
+                else if (SupportsFilter("zscale"))
+                {
+                    enableHdrExtraction = true;
+                    filters.Add("zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0:peak=100,zscale=t=bt709:m=bt709,format=yuv420p");
+                }
             }
 
             var vf = string.Join(',', filters);