Update app.py

app.py

@@ -271,12 +271,14 @@ def loadurl(url):
     return url
 
 def select_frame(evt: gr.SelectData):
+    global depth_selected
     if evt.index != depth_selected:
         print(output_frame.selected_index)
         depth_selected = evt.index
         return gr.Gallery(selected_index=evt.index, preview=True)
 
 def select_depth(evt: gr.SelectData):
+    global frame_selected
     if evt.index != frame_selected:
         print(output_depth.selected_index)
         frame_selected = evt.index