diff --git a/src/rtsp_manager.cpp b/src/rtsp_manager.cpp
index 3c3928c..0c96561 100644
--- a/src/rtsp_manager.cpp
+++ b/src/rtsp_manager.cpp
@@ -25,29 +25,21 @@ void RTSPManager::init()
 // 创建 media factory
 GstRTSPMediaFactory *RTSPManager::create_media_factory(const Camera &cam)
 {
+    // 输出分辨率直接用相机原始分辨率
     int out_width = cam.width;
     int out_height = cam.height;
 
-    // 如果是 1280x960，则裁剪到 1280x720
-    std::string videocrop_str;
-    if (cam.width == 1280 && cam.height == 960)
-    {
-        out_height = 720;
-        int crop_top = (960 - 720) / 2;
-        videocrop_str = " ! videocrop top=" + std::to_string(crop_top) + " bottom=" + std::to_string(crop_top);
-    }
-
+    // 构建 pipeline
     std::string launch_str =
         "( v4l2src device=" + cam.device +
-        " ! video/x-raw,format=NV12,width=" + std::to_string(cam.width) +
-        ",height=" + std::to_string(cam.height) +
+        " ! video/x-raw,format=NV12,width=" + std::to_string(out_width) +
+        ",height=" + std::to_string(out_height) +
         ",framerate=" + std::to_string(cam.fps) + "/1"
-                                                  " ! queue max-size-buffers=8 leaky=2" +
-        videocrop_str +
-        " ! queue max-size-buffers=8 leaky=2"
-        " ! mpph264enc"
-        " ! h264parse"
-        " ! rtph264pay name=pay0 pt=96 )";
+                                                  " ! queue max-size-buffers=2 leaky=downstream"
+                                                  " ! mpph264enc bps=2000000 gop=" +
+        std::to_string(cam.fps) + " b_frame=0"
+                                  " ! h264parse"
+                                  " ! rtph264pay name=pay0 pt=96 )";
 
     GstRTSPMediaFactory *factory = gst_rtsp_media_factory_new();
     gst_rtsp_media_factory_set_launch(factory, launch_str.c_str());