Update app.py

app.py

@@ -50,7 +50,7 @@ with gr.Blocks() as demo:
             gr.Video("old_video.mp4")
         with gr.Column():
             gr.Markdown("**Example Acapella Video**")
-            gr.Video("acapella_video.mp4")   
+            gr.Video(placeholder_file)   
 
     gr.Markdown("**Try it yourself:** (for now, I recommend short videos <3 minutes)")
     io.render()