diff --git a/biz/base_frame_processor.py b/biz/base_frame_processor.py
index 9cbfc8e..cf9335b 100644
--- a/biz/base_frame_processor.py
+++ b/biz/base_frame_processor.py
@@ -81,7 +81,16 @@ class BaseFrameProcessorWorker(threading.Thread):
     
     def _encode_image_to_base64(self, img) -> str:
         """图像编码为 Base64"""
-        ok, buf = cv2.imencode(".jpg", img)
+        # 检查并调整图片尺寸
+        h, w = img.shape[:2]
+        if h > 720:
+            new_h = 720
+            new_w = int(w * (720 / h))
+            img = cv2.resize(img, (new_w, new_h), interpolation=cv2.INTER_AREA)
+        
+        # 设置JPEG质量参数
+        params = [int(cv2.IMWRITE_JPEG_QUALITY), 80]  # 质量0.8
+        ok, buf = cv2.imencode(".jpg", img, params)
         if not ok:
             raise RuntimeError("Failed to encode image to JPEG")
         return base64.b64encode(buf.tobytes()).decode("ascii")