finished

app.py

@@ -40,10 +40,6 @@ def convert_to_grayscale(video_file, history):
 
     return output_file, history
 
-def get_history(history):
-    history_html = "<br>".join(history)
-    return history_html
-
 with gr.Blocks() as demo:
     history_state = gr.State([])
 
@@ -62,9 +58,11 @@ with gr.Blocks() as demo:
     with gr.Tab("History") as history_tab:
         history_output = gr.HTML(label="History")
 
-        def update_history(history):
-            return get_history(history)
-
-        convert_button.click(fn=update_history, inputs=history_state, outputs=history_output)
+        history_output.change(
+            fn=lambda history: "<pre>" + "\n".join(history) + "</pre>",
+            inputs=history_state,
+            outputs=history_output,
+            queue=False
+        )
 
 demo.launch()