Update app.py

app.py

@@ -287,7 +287,7 @@ with gr.Blocks(css=css) as demo:
 
     apply_to_video_btn.click(
         fn = replace_video_audio,
-        inputs = [combined_output, video_input],
+        inputs = [video_input, combined_output],
         outputs = [final_video_out]
     )