Update app.py

app.py

@@ -120,7 +120,8 @@ iface: gr.Interface = gr.Interface(
 )
 
 # make mp3 bitrate slider visible only when "save as mp3" is checked
-iface.inputs[-2].change(fn=lambda mp3: gr.update(visible=mp3), inputs=iface.inputs[-2], outputs=iface.inputs[-1])
+# iface.inputs[-2].change(fn=lambda mp3: gr.update(visible=mp3), inputs=iface.inputs[-2], outputs=iface.inputs[-1])
+iface.components[-2].change(fn=lambda mp3: gr.update(visible=mp3), inputs=iface.components[-2], outputs=iface.components[-1])
 
 # launch the gradio interface
 iface.launch()