diff --git a/build_multi_version.py b/build_multi_version.py
index 3113077..8a116f6 100644
--- a/build_multi_version.py
+++ b/build_multi_version.py
@@ -131,7 +131,27 @@ def copy_additional_files():
     """Copy non-Python files that don't need obfuscation."""
     print("\n=== Copying additional files ===")
     
-    # Copy config directory
+    # Ensure configs directory exists in obfuscated output
+    # PyArmor should copy it, but we verify and copy if needed
+    configs_src = Path('src/orisys/configs')
+    configs_dst = Path('dist_obfuscated/src/orisys/configs')
+    
+    if configs_src.exists():
+        print(f"Ensuring configs directory is copied...")
+        if not configs_dst.exists():
+            print(f"Copying configs directory from {configs_src} to {configs_dst}")
+            shutil.copytree(configs_src, configs_dst, dirs_exist_ok=True)
+        else:
+            # Verify JSON files are present
+            json_files_src = list(configs_src.glob('*.json'))
+            json_files_dst = list(configs_dst.glob('*.json'))
+            if len(json_files_dst) < len(json_files_src):
+                print(f"Updating configs directory (found {len(json_files_dst)}/{len(json_files_src)} JSON files)")
+                shutil.copytree(configs_src, configs_dst, dirs_exist_ok=True)
+            else:
+                print(f"Configs directory already present with {len(json_files_dst)} JSON files")
+    
+    # Copy config directory (if exists at root level)
     if os.path.exists('config'):
         print("Copying config directory...")
         shutil.copytree('config', 'dist_obfuscated/config', dirs_exist_ok=True)
@@ -166,15 +186,32 @@ with open('requirements.txt', 'r') as f:
 # Find all packages including pyarmor_runtime
 packages = find_packages(where="src")
 
-# Collect all package data including PyArmor runtime files
+# Collect all package data including PyArmor runtime files and configs
 package_data = {{}}
 for pkg in packages:
     pkg_path = Path('src') / pkg.replace('.', '/')
     if pkg_path.exists():
-        # Include all .pyd, .so, .dll files (PyArmor runtime)
         data_files = []
+        
+        # Include all .pyd, .so, .dll files (PyArmor runtime)
         for pattern in ['*.pyd', '*.so', '*.dll', '*.dylib']:
             data_files.extend([str(f.relative_to(pkg_path)) for f in pkg_path.glob(pattern)])
+        
+        # Include JSON files from configs directory (for orisys.configs package)
+        if pkg == 'orisys.configs':
+            # Include all JSON files in the configs package directory
+            for json_file in pkg_path.glob('*.json'):
+                rel_path = json_file.relative_to(pkg_path)
+                data_files.append(str(rel_path))
+        
+        # For orisys package, include configs subdirectory JSON files
+        if pkg == 'orisys':
+            configs_dir = pkg_path / 'configs'
+            if configs_dir.exists() and configs_dir.is_dir():
+                for json_file in configs_dir.glob('*.json'):
+                    rel_path = json_file.relative_to(pkg_path)
+                    data_files.append(str(rel_path))
+        
         if data_files:
             package_data[pkg] = data_files
 
@@ -205,6 +242,29 @@ setup(
     print("setup.py created successfully!")
 
 
+def create_manifest_in():
+    """Create MANIFEST.in to ensure JSON files in configs are included."""
+    print("\n=== Creating MANIFEST.in ===")
+    
+    manifest_content = """# Include all JSON files in configs directory
+include src/orisys/configs/*.json
+recursive-include src/orisys/configs *.json
+
+# Include PyArmor runtime files
+recursive-include src *.pyd
+recursive-include src *.so
+recursive-include src *.dll
+recursive-include src *.dylib
+"""
+    
+    manifest_path = Path('dist_obfuscated/MANIFEST.in')
+    with open(manifest_path, 'w') as f:
+        f.write(manifest_content)
+    
+    print("MANIFEST.in created successfully!")
+    print(manifest_content)
+
+
 def get_platform_tag():
     """Get the platform tag for wheel naming."""
     system = platform.system()
@@ -347,9 +407,12 @@ def main():
         print("\n❌ Build failed during obfuscation!")
         sys.exit(1)
     
-    # Step 3: Copy additional files
+    # Step 3: Copy additional files (including configs)
     copy_additional_files()
     
+    # Step 3.5: Create MANIFEST.in to ensure JSON files are included
+    create_manifest_in()
+    
     # Step 4 & 5: Build based on mode
     if build_mode == 'universal':
         # Build one wheel for all Python versions
diff --git a/src/orisys/sensor.py b/src/orisys/sensor.py
index 8cf3fa6..f831187 100644
--- a/src/orisys/sensor.py
+++ b/src/orisys/sensor.py
@@ -514,7 +514,20 @@ class Sensor:
 
     def _open_video_source(self, override, box):
         """Initialize video capture and calibration."""
-        self.cap = cv2.VideoCapture(self.vid_src)
+        # Use DirectShow backend on Windows for cameras (more stable than MSMF)
+        if isinstance(self.vid_src, int):
+            # For camera indices, try DirectShow first (avoids MSMF errors)
+            try:
+                self.cap = cv2.VideoCapture(self.vid_src, cv2.CAP_DSHOW)
+            except:
+                # Fallback to default backend
+                self.cap = cv2.VideoCapture(self.vid_src)
+        else:
+            # For file paths, use default backend
+            self.cap = cv2.VideoCapture(self.vid_src)
+        
+        # Set buffer size to 1 to reduce latency and avoid frame accumulation
+        self.cap.set(cv2.CAP_PROP_BUFFERSIZE, 1)
         self.cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter.fourcc('M', 'J', 'P', 'G'))
         self.cap.set(cv2.CAP_PROP_FPS, self._config_fps)
         self.cap.set(cv2.CAP_PROP_FRAME_WIDTH, self._config_resolution_raw[0])