diff --git a/algorithm/sv_algorithm_base.cpp b/algorithm/sv_algorithm_base.cpp
index d94a336..0f23509 100644
--- a/algorithm/sv_algorithm_base.cpp
+++ b/algorithm/sv_algorithm_base.cpp
@@ -32,7 +32,7 @@ CameraAlgorithm::CameraAlgorithm()
   // this->_allocator = NULL;
   this->_t0 = std::chrono::system_clock::now();
 
-  this->alg_params_fn = _get_home() + SV_ROOT_DIR + "params/a-params/sv_algorithm_params.json";
+  this->alg_params_fn = _get_home() + SV_ROOT_DIR + "confs/sv_algorithm_params.json";
   // std::cout << "CameraAlgorithm->alg_params_fn: " << this->alg_params_fn << std::endl;
   // if (_is_file_exist(params_fn))
   //   this->loadAlgorithmParams(params_fn);
diff --git a/scripts/model_sync.py b/scripts/model_sync.py
index 6967ee0..fd744c1 100644
--- a/scripts/model_sync.py
+++ b/scripts/model_sync.py
@@ -9,6 +9,8 @@ root_url = "https://download.amovlab.com/model/SpireCV-models/"
 model_list_url = root_url + "model-list.txt"
 root_path = os.path.expanduser("~") + "/SpireCV/models"
 print("MODEL PATH:", root_path)
+if not os.path.exists(root_path):
+    os.makedirs(root_path)
 list_file = os.path.join(root_path, "model-list.txt")
 
 
diff --git a/video_io/sv_video_base.cpp b/video_io/sv_video_base.cpp
index 168e358..60fdfa1 100644
--- a/video_io/sv_video_base.cpp
+++ b/video_io/sv_video_base.cpp
@@ -1173,6 +1173,7 @@ void CameraBase::openImpl()
 }
 void CameraBase::open(CameraType type, int id)
 {
+  this->release();
   this->_type = type;
   this->_camera_id = id;
 
@@ -1215,7 +1216,7 @@ bool CameraBase::read(cv::Mat& image)
         this->_is_updated = false;
         break;
       }
-      std::this_thread::sleep_for(std::chrono::milliseconds(20));
+      std::this_thread::sleep_for(std::chrono::milliseconds(2));
       n_try ++;
     }
   }
@@ -1227,7 +1228,10 @@ bool CameraBase::read(cv::Mat& image)
 }
 void CameraBase::release()
 {
-  _cap.release();
+  this->_is_running = false;
+  this->_is_updated = false;
+  if (this->_cap.isOpened())
+    this->_cap.release();
 }