Fix stream map when using filter_complex with unlabeled output

Signed-off-by: nyanmisaka <nst799610810@gmail.com>

Jellyfin.Api/Controllers/DynamicHlsController.cs

@@ -1844,7 +1844,11 @@ namespace Jellyfin.Api.Controllers
                 // args += " -mixed-refs 0 -refs 3 -x264opts b_pyramid=0:weightb=0:weightp=0";
 
                 // video processing filters.
-                args += _encodingHelper.GetVideoProcessingFilterParam(state, _encodingOptions, codec);
+                var videoProcessParam = _encodingHelper.GetVideoProcessingFilterParam(state, _encodingOptions, codec);
+
+                var negativeMapArgs = _encodingHelper.GetNegativeMapArgsByFilters(state, videoProcessParam);
+
+                args = negativeMapArgs + args + videoProcessParam;
 
                 // -start_at_zero is necessary to use with -ss when seeking,
                 // otherwise the target position cannot be determined.

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -2397,6 +2397,30 @@ namespace MediaBrowser.Controller.MediaEncoding
             return args;
         }
 
+        /// <summary>
+        /// Gets the negative map args by filters.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <param name="videoProcessFilters">The videoProcessFilters.</param>
+        /// <returns>System.String.</returns>
+        public string GetNegativeMapArgsByFilters(EncodingJobInfo state, string videoProcessFilters)
+        {
+            string args = string.Empty;
+
+            // http://ffmpeg.org/ffmpeg-all.html#toc-Complex-filtergraphs-1
+            if (state.VideoStream != null && videoProcessFilters.Contains("-filter_complex", StringComparison.Ordinal))
+            {
+                int videoStreamIndex = FindIndex(state.MediaSource.MediaStreams, state.VideoStream);
+
+                args += string.Format(
+                    CultureInfo.InvariantCulture,
+                    "-map -0:{0} ",
+                    videoStreamIndex);
+            }
+
+            return args;
+        }
+
         /// <summary>
         /// Determines which stream will be used for playback.
         /// </summary>
@@ -5428,7 +5452,9 @@ namespace MediaBrowser.Controller.MediaEncoding
                 // video processing filters.
                 var videoProcessParam = GetVideoProcessingFilterParam(state, encodingOptions, videoCodec);
 
-                args += videoProcessParam;
+                var negativeMapArgs = GetNegativeMapArgsByFilters(state, videoProcessParam);
+
+                args = negativeMapArgs + args + videoProcessParam;
 
                 hasCopyTs = videoProcessParam.Contains("copyts", StringComparison.OrdinalIgnoreCase);