update app.py refresh_bth

app.py

@@ -324,7 +324,13 @@ def sadtalker_demo():
                     scale=1,
                     show_download_button=True,
                 )
-            refresh_btn.click(fn=lambda: gr.update(choices=list_videos()), outputs=video_list)
+            refresh_btn.click(
+                fn=lambda: gr.update(
+                    choices=["Vui lòng chọn video"] + list_videos(),
+                    value="Vui lòng chọn video",
+                ),
+                outputs=video_list,
+            )
             video_list.change(lambda x: x, inputs=video_list, outputs=video_player)
         with gr.Tab("Debug"):
             with gr.Blocks() as demo: