Update app.py

app.py

@@ -52,9 +52,13 @@ def video_frame_callback(frame):
 webrtc_ctx = webrtc_streamer(
     key="keyboard-demo",
     mode=WebRtcMode.SENDRECV,
-    rtc_configuration={"iceServers": get_ice_servers()},
+    rtc_configuration={
+        "iceServers": get_ice_servers(),
+        "iceTransportPolicy": "relay",
+    },
     video_frame_callback=video_frame_callback,
     media_stream_constraints={"video": True, "audio": False},
+    async_processing=True,
 )
 
 st.markdown("### Instructions")