Fixed SMI to SRT UTF-16 Encoding bug

CONTRIBUTORS.md

@@ -27,6 +27,7 @@
  - [pjeanjean](https://github.com/pjeanjean)
  - [DrPandemic](https://github.com/drpandemic)
  - [joern-h](https://github.com/joern-h)
+ - [Khinenw](https://github.com/HelloWorld017)
 
 # Emby Contributors
 

MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs

@@ -425,7 +425,13 @@ namespace MediaBrowser.MediaEncoding.Subtitles
 
             var encodingParam = await GetSubtitleFileCharacterSet(inputPath, language, inputProtocol, cancellationToken).ConfigureAwait(false);
 
-            if (!string.IsNullOrEmpty(encodingParam))
+            // FFmpeg automatically convert character encoding when it is UTF-16
+            // If we specify character encoding, it rejects with "do not specify a character encoding" and "Unable to recode subtitle event"
+            if ((inputPath.EndsWith(".smi") || inputPath.EndsWith(".sami")) && (encodingParam == "UTF-16BE" || encodingParam == "UTF-16LE"))
+            {
+                encodingParam = "";
+            }
+            else if (!string.IsNullOrEmpty(encodingParam))
             {
                 encodingParam = " -sub_charenc " + encodingParam;
             }