Fix MicroDVD being recognized as DVDSUB subtitles (#12149)

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -1208,8 +1208,8 @@ namespace MediaBrowser.Controller.MediaEncoding
                 var subtitlePath = state.SubtitleStream.Path;
                 var subtitleExtension = Path.GetExtension(subtitlePath.AsSpan());
 
-                if (subtitleExtension.Equals(".sub", StringComparison.OrdinalIgnoreCase)
-                    || subtitleExtension.Equals(".sup", StringComparison.OrdinalIgnoreCase))
+                // dvdsub/vobsub graphical subtitles use .sub+.idx pairs
+                if (subtitleExtension.Equals(".sub", StringComparison.OrdinalIgnoreCase))
                 {
                     var idxFile = Path.ChangeExtension(subtitlePath, ".idx");
                     if (File.Exists(idxFile))

MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs

@@ -624,15 +624,19 @@ namespace MediaBrowser.MediaEncoding.Probing
         {
             if (string.Equals(codec, "dvb_subtitle", StringComparison.OrdinalIgnoreCase))
             {
-                codec = "dvbsub";
+                codec = "DVBSUB";
             }
-            else if ((codec ?? string.Empty).Contains("PGS", StringComparison.OrdinalIgnoreCase))
+            else if (string.Equals(codec, "dvb_teletext", StringComparison.OrdinalIgnoreCase))
             {
-                codec = "PGSSUB";
+                codec = "DVBTXT";
             }
-            else if ((codec ?? string.Empty).Contains("DVD", StringComparison.OrdinalIgnoreCase))
+            else if (string.Equals(codec, "dvd_subtitle", StringComparison.OrdinalIgnoreCase))
             {
-                codec = "DVDSUB";
+                codec = "DVDSUB"; // .sub+.idx
+            }
+            else if (string.Equals(codec, "hdmv_pgs_subtitle", StringComparison.OrdinalIgnoreCase))
+            {
+                codec = "PGSSUB"; // .sup
             }
 
             return codec;

MediaBrowser.Model/Entities/MediaStream.cs

@@ -656,14 +656,14 @@ namespace MediaBrowser.Model.Entities
         {
             string codec = format ?? string.Empty;
 
-            // sub = external .sub file
-
-            return !codec.Contains("pgs", StringComparison.OrdinalIgnoreCase)
-                   && !codec.Contains("dvd", StringComparison.OrdinalIgnoreCase)
-                   && !codec.Contains("dvbsub", StringComparison.OrdinalIgnoreCase)
-                   && !string.Equals(codec, "sub", StringComparison.OrdinalIgnoreCase)
-                   && !string.Equals(codec, "sup", StringComparison.OrdinalIgnoreCase)
-                   && !string.Equals(codec, "dvb_subtitle", StringComparison.OrdinalIgnoreCase);
+            // microdvd and dvdsub/vobsub share the ".sub" file extension, but it's text-based.
+
+            return codec.Contains("microdvd", StringComparison.OrdinalIgnoreCase)
+                   || (!codec.Contains("pgs", StringComparison.OrdinalIgnoreCase)
+                       && !codec.Contains("dvdsub", StringComparison.OrdinalIgnoreCase)
+                       && !codec.Contains("dvbsub", StringComparison.OrdinalIgnoreCase)
+                       && !string.Equals(codec, "sup", StringComparison.OrdinalIgnoreCase)
+                       && !string.Equals(codec, "sub", StringComparison.OrdinalIgnoreCase));
         }
 
         public bool SupportsSubtitleConversionTo(string toCodec)