diff --git a/configs/test_cam1_face_det_rtsp_server.json b/configs/test_cam1_face_det_rtsp_server.json
index 23932f2..9030bb4 100644
--- a/configs/test_cam1_face_det_rtsp_server.json
+++ b/configs/test_cam1_face_det_rtsp_server.json
@@ -36,11 +36,11 @@
           "role": "filter",
           "enable": true,
           "model_path": "./models/RetinaFace_mobile320.rknn",
-          "conf": 0.02,
+          "conf": 0.002,
           "nms": 0.4,
           "max_faces": 10,
           "output_landmarks": true,
-          "input_format": "rgb",
+          "input_format": "bgr",
           "face_class_index": -1,
           "letterbox": true
         },
diff --git a/include/utils/simple_json.h b/include/utils/simple_json.h
index ad4843b..875fe37 100644
--- a/include/utils/simple_json.h
+++ b/include/utils/simple_json.h
@@ -5,11 +5,13 @@
 #pragma once
 
 #include <cctype>
+#include <cerrno>
 #include <map>
 #include <optional>
 #include <cstdlib>
 #include <string>
 #include <string_view>
+#include <type_traits>
 #include <variant>
 #include <vector>
 
@@ -119,6 +121,8 @@ public:
             return child->AsString(def);
         } else if constexpr (std::is_same_v<T, double>) {
             return child->AsNumber(def);
+        } else if constexpr (std::is_same_v<T, float>) {
+            return static_cast<float>(child->AsNumber(static_cast<double>(def)));
         } else if constexpr (std::is_same_v<T, int>) {
             return child->AsInt(def);
         } else if constexpr (std::is_same_v<T, bool>) {