try to detect 3d type

MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs

@@ -168,6 +168,12 @@ namespace MediaBrowser.MediaEncoding.Probing
                 }
 
                 ExtractTimestamp(info);
+
+                var stereoMode = GetDictionaryValue(tags, "stereo_mode");
+                if (string.Equals(stereoMode, "left_right", StringComparison.OrdinalIgnoreCase))
+                {
+                    info.Video3DFormat = Video3DFormat.FullSideBySide;
+                }
             }
 
             return info;

MediaBrowser.Providers/MediaInfo/FFProbeVideoInfo.cs

@@ -231,6 +231,8 @@ namespace MediaBrowser.Providers.MediaInfo
             video.HasSubtitles = mediaStreams.Any(i => i.Type == MediaStreamType.Subtitle);
             video.Timestamp = mediaInfo.Timestamp;
 
+            video.Video3DFormat = video.Video3DFormat ?? mediaInfo.Video3DFormat;
+
             await _itemRepo.SaveMediaStreams(video.Id, mediaStreams, cancellationToken).ConfigureAwait(false);
 
             if (options.MetadataRefreshMode == MetadataRefreshMode.FullRefresh ||