ff

bin/ffx/media_descriptor.py

@@ -165,6 +165,18 @@ class MediaDescriptor:
                     TrackDisposition.FORCED, t.getSubIndex() == int(subIndex)
                 )
 
+    def checkDefaultAndForcedDispositions(self):
+        try:
+            self.getDefaultVideoTrack()
+            self.getForcedVideoTrack()
+            self.getDefaultAudioTrack()
+            self.getForcedAudioTrack()
+            self.getDefaultSubtitleTrack()
+            self.getForcedSubtitleTrack()
+            return True
+        except ValueError:
+            return False
+
     def getReorderedTrackDescriptors(self):
 
         videoTracks = self.sortSubIndices(self.getVideoTracks())

bin/ffx/media_details_screen.py

@@ -463,6 +463,9 @@ class MediaDetailsScreen(Screen):
 
     def action_new_pattern(self):
         
+        if not self.__currentMediaDescriptor.checkDefaultAndForcedDispositions():
+            return
+
         selectedShow = self.getSelectedShow()
         
         #HINT: Callback is invoked after this method has exited. As a workaround the callback is executed directly