Update app.py

app.py

@@ -305,12 +305,12 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
     video_clear_button.click(
         fn=lambda: (
             None,
-            None,
+            None
         ),
         outputs=[
             video_input,
-            video_output,
-        ],
+            video_output
+        ]
     )
     video_detect_button.click(
         fn=process_video,