diff --git a/configs/test_cam1_face_det_rtsp_server.json b/configs/test_cam1_face_det_rtsp_server.json
index ce823ec..d4d7522 100644
--- a/configs/test_cam1_face_det_rtsp_server.json
+++ b/configs/test_cam1_face_det_rtsp_server.json
@@ -40,11 +40,7 @@
           "nms": 0.4,
           "max_faces": 10,
           "output_landmarks": true,
-          "input_format": "bgr",
-          "input_dtype": "float32",
-          "normalize": {
-            "scale": 0.00392156862
-          }
+          "input_format": "rgb"
         },
         {
           "id": "osd_cam1",
diff --git a/plugins/ai_face_det/ai_face_det_node.cpp b/plugins/ai_face_det/ai_face_det_node.cpp
index b32ab7a..385a36e 100644
--- a/plugins/ai_face_det/ai_face_det_node.cpp
+++ b/plugins/ai_face_det/ai_face_det_node.cpp
@@ -5,6 +5,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <cstring>
+#include <fstream>
 #include <iostream>
 #include <memory>
 #include <numeric>
@@ -548,6 +549,18 @@ private:
             input_ptr = input_buf_.data();
         }
 
+        // Debug: save first frame to file for inspection
+        static bool dbg_saved_input = false;
+        if (!dbg_saved_input) {
+            dbg_saved_input = true;
+            std::ofstream ofs("/tmp/face_det_input.rgb", std::ios::binary);
+            if (ofs) {
+                ofs.write(reinterpret_cast<const char*>(input_ptr), static_cast<std::streamsize>(in_size));
+                LogInfo("[ai_face_det] saved input to /tmp/face_det_input.rgb (" +
+                        std::to_string(in_w) + "x" + std::to_string(in_h) + " RGB)");
+            }
+        }
+
         InferInput input;
         input.width = in_w;
         input.height = in_h;