diff --git a/reproject/alert.py b/reproject/alert.py
index 0a9fa2d..ccc54ee 100644
--- a/reproject/alert.py
+++ b/reproject/alert.py
@@ -18,6 +18,7 @@ class Alert:
         self.encode_thread = None
         self.upload_thread = None
         self.stop_event = threading.Event()
+        self.abort_event = threading.Event()  # 新增：用于超时强制中断
         self.dropped_frames = 0
 
     def start(self, width=1920, height=1080, fps=30):
@@ -54,15 +55,19 @@ class Alert:
         self.stream.width = width
         self.stream.height = height
         self.stream.pix_fmt = "yuv420p"
-        # 使用更快的编码预设
-        # self.stream.options = {"preset": "ultrafast", "crf": "23"}
+        self.stream.options = {"preset": "ultrafast", "tune": "zerolatency", "crf": "23"}
         print("AV container and stream initialized")
 
         # 启动编码线程
         def _encode() -> None:
             try:
                 print("Encode thread starting")
+                # 修改循环条件：增加 abort_event 检查
                 while not self.stop_event.is_set() or not self.frame_queue.empty():
+                    if self.abort_event.is_set():
+                        print("Encode thread aborted by timeout (dropping remaining frames)")
+                        break
+                    
                     try:
                         frame = self.frame_queue.get(timeout=0.1)
                         if frame is None:
@@ -100,13 +105,10 @@ class Alert:
         self.frame_queue.put(None)
         self.stop_event.set()
 
-        # 等待编码线程完成
+        # 等待编码线程完成（不设超时，确保所有帧都编码完成）
         if self.encode_thread:
-            self.encode_thread.join(timeout=30)
-            if self.encode_thread.is_alive():
-                print("Warning: Encode thread still running after timeout")
-            else:
-                print(f"Encode thread completed with {self.frame_count} frames")
+            self.encode_thread.join()
+            print(f"Encode thread completed with {self.frame_count} frames")
 
         # 完成编码，flush所有待处理的数据
         try:
diff --git a/reproject/main.py b/reproject/main.py
index 45f04b3..d10b3a1 100644
--- a/reproject/main.py
+++ b/reproject/main.py
@@ -1,5 +1,6 @@
 from calendar import c
 from tracemalloc import stop
+from av import buffer
 import cv2
 import threading
 import time
@@ -46,7 +47,7 @@ def capture_thread():
     """
     采集线程：优化了分发逻辑，对视频流进行降频处理
     """
-    cap = cv2.VideoCapture(0)
+    cap = cv2.VideoCapture(1)
     cap.set(cv2.CAP_PROP_FRAME_WIDTH, 1280)
     cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 720)
 
@@ -208,7 +209,7 @@ def analysis_thread():
         payload["eye_close_freq"] = last_freq
         front_data["eye_close_freq"] = last_freq
         bpm = heart_monitor.process_frame(frame, result["landmark"])
-        if bpm != None:
+        if bpm != None and result["has_face"]:
             result["heart_rate"] = bpm
             payload["heart_rate"] = bpm
             front_data["heart_rate"] = bpm
@@ -446,6 +447,7 @@ def alert_thread(server):
     alert_status = False
     alert_st = ""
     level = 0
+    timett = 0
     while not stop_event.is_set():
         try:
             frame = ana_video_queue.get(timeout=1)
@@ -484,6 +486,15 @@ def alert_thread(server):
                 # no_face_time
                 if data["label"] == "":
                     no_face_time += 1
+                    sleep_time = 0
+                    haqian_time = 0
+                    heart_spe = 0
+                    heart_num = 0
+                    eye_close = False
+                    down_emo_time = 0
+                    pianyi_time = 0
+                else:
+                    no_face_time = 0
 
                 alert_time = now
 
@@ -497,7 +508,7 @@ def alert_thread(server):
                     alert_st += alert_info["pianyi_time"] + "; "
                     pianyi_time = 0
                     level += 1
-                if no_face_time >= 60:
+                if no_face_time >= 30:
                     alert_status = True
                     alert_st += alert_info["no_face_time"] + "; "
                     no_face_time = 0
@@ -517,7 +528,7 @@ def alert_thread(server):
                     alert_status = True
                     alert_st += alert_info["haqian_time"] + ";"
                     level += 1
-                if heart_spe < 60 or heart_spe > 120:
+                if (heart_spe < 60 and timett != 0 and heart_spe != 0) or heart_spe > 120:
                     alert_status = True
                     alert_st += alert_info["heart_spe"] + ";"
                     level += 1
@@ -543,18 +554,38 @@ def alert_thread(server):
                     alert = server.alert(int(time.time()), alert_st, info_level)
                     alert = HookMocker(alert, "http://10.128.48.48:5000/api/osshook")
                     alert.start(width=1280, height=720, fps=30)
-                    for f in buffered_frame:
-                        alert.provide_frame(f)
-                    alert.end()
+                    print(f"upload buffered frames... {buffered_frame.__len__()}")
+                    frames_to_upload = buffered_frame
+                    buffered_frame = []
+                    upload_task = threading.Thread(
+                        target=handle_alert_upload,
+                        args=(frames_to_upload, alert),
+                        daemon=True
+                    )
+                    upload_task.start()                  
                 alert_status = False
                 alert_st = ""
                 buffered_frame = []
                 level = 0
+                timett += 1
         except queue.Empty:
             continue
-        except Exception as e:
-            print(f"[Alert] 错误: {e}")
-            continue
+        # except Exception as e:
+        #     print(f"[Alert] 错误: {e}")
+        #     continue
+
+def handle_alert_upload(frames, _alert_instance):
+    """
+    后台线程：负责将缓存的帧喂给 alert 对象，并执行编码和上传
+    """
+    try:
+        # print("后台上传线程启动...")
+        for f in frames:
+            _alert_instance.provide_frame(f)
+        _alert_instance.end() # 这里阻塞也没关系，因为是在后台线程里
+        # print("后台上传线程结束")
+    except Exception as e:
+        print(f"后台上传出错: {e}")
 
 
 def draw_debug_info(frame, result):