diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index c9122ab469..cd805f3dc5 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -7151,7 +7151,8 @@ namespace MediaBrowser.Controller.MediaEncoding
                 inputModifier += " -async " + state.InputAudioSync;
             }
 
-            if (!string.IsNullOrEmpty(state.InputVideoSync))
+            // The -fps_mode option cannot be applied to input
+            if (!string.IsNullOrEmpty(state.InputVideoSync) && _mediaEncoder.EncoderVersion < new Version(5, 1))
             {
                 inputModifier += GetVideoSyncOption(state.InputVideoSync, _mediaEncoder.EncoderVersion);
             }