Update app.py

app.py

@@ -5,14 +5,6 @@
 Set DASHSCOPE_API_KEY in the environment before running.
 """
 import os
-import time
-import base64
-import asyncio
-import json
-import secrets
-import signal
-from pathlib import Path
-
 import gradio as gr
 import numpy as np
 from dotenv import load_dotenv
@@ -20,7 +12,9 @@ from fastapi import FastAPI
 from fastapi.responses import HTMLResponse, StreamingResponse
 from fastrtc import (
     AdditionalOutputs,
-    AsyncStreamHandler,
+    # AsyncStreamHandler,
+    AsyncAudioVideoStreamHandler,
+    WebRTC,
     Stream,
     get_cloudflare_turn_credentials_async,
     wait_for_item,