update SubtitleService

MediaBrowser.Api/Subtitles/SubtitleService.cs

@@ -216,19 +216,20 @@ namespace MediaBrowser.Api.Subtitles
             }
 
             using (var stream = await GetSubtitles(request).ConfigureAwait(false))
+            {
+                if (string.Equals(request.Format, "vtt", StringComparison.OrdinalIgnoreCase) && request.AddVttTimeMap)
                 {
                     using (var reader = new StreamReader(stream))
                     {
                         var text = reader.ReadToEnd();
 
-                    if (string.Equals(request.Format, "vtt", StringComparison.OrdinalIgnoreCase) && request.AddVttTimeMap)
-                    {
                         text = text.Replace("WEBVTT", "WEBVTT\nX-TIMESTAMP-MAP=MPEGTS:900000,LOCAL:00:00:00.000");
-                    }
 
                         return ResultFactory.GetResult(text, MimeTypes.GetMimeType("file." + request.Format));
                     }
                 }
+                return ResultFactory.GetResult(stream, MimeTypes.GetMimeType("file." + request.Format));
+            }
         }
 
         private Task<Stream> GetSubtitles(GetSubtitle request)