diff --git a/pipeline_webcam.py b/pipeline_webcam.py
index 8c1ca3e..88babac 100755
--- a/pipeline_webcam.py
+++ b/pipeline_webcam.py
@@ -1,22 +1,32 @@
-#!/usr/bin/python3
-
 import argparse
 import os
 import cv2
 import time
 import logging
 import shutil
+import threading  # added threading
 
 from siwatsystem.pympta import load_pipeline_from_zip, run_pipeline
 
 logging.basicConfig(level=logging.DEBUG, format="%(asctime)s [%(levelname)s] %(message)s")
 
+# Global variables for frame sharing
+global_frame = None
+global_ret = False
+capture_running = False
+
+def video_capture_loop(cap):
+    global global_frame, global_ret, capture_running
+    while capture_running:
+        global_ret, global_frame = cap.read()
+        time.sleep(0.01)  # slight delay to reduce CPU usage
+
 def clear_cache(cache_dir: str):
     if os.path.exists(cache_dir):
         shutil.rmtree(cache_dir)
-    os.makedirs(cache_dir, exist_ok=True)
 
 def main(mpta_file: str, video_source: str):
+    global capture_running
     CACHE_DIR = os.path.join(".", ".mptacache")
     clear_cache(CACHE_DIR)
     logging.info(f"Loading pipeline from local file: {mpta_file}")
@@ -30,13 +40,19 @@ def main(mpta_file: str, video_source: str):
         logging.error(f"Cannot open video source {video_source}")
         return
 
+    # Start video capture in a separate thread
+    capture_running = True
+    capture_thread = threading.Thread(target=video_capture_loop, args=(cap,))
+    capture_thread.start()
+
     logging.info("Press 'q' to exit.")
     try:
         while True:
-            ret, frame = cap.read()
-            if not ret:
-                logging.error("Failed to capture frame.")
-                break
+            # Use the global frame and ret updated by the thread
+            if not global_ret or global_frame is None:
+                continue  # wait until a frame is available
+            
+            frame = global_frame  # local copy to work with
 
             detection, bbox = run_pipeline(frame, model_tree, return_bbox=True)
             if bbox:
@@ -50,9 +66,11 @@ def main(mpta_file: str, video_source: str):
             if cv2.waitKey(1) & 0xFF == ord('q'):
                 break
     finally:
+        # Stop capture thread and cleanup
+        capture_running = False
+        capture_thread.join()
         cap.release()
         cv2.destroyAllWindows()
-        # Clear cache on shutdown
         clear_cache(CACHE_DIR)
         logging.info("Cleaned up .mptacache directory on shutdown.")
 
diff --git a/siwatsystem/pympta.py b/siwatsystem/pympta.py
index 20b2770..5179799 100644
--- a/siwatsystem/pympta.py
+++ b/siwatsystem/pympta.py
@@ -106,7 +106,8 @@ def run_pipeline(frame, node: dict, return_bbox: bool = False):
                     best_box = box_cpu
 
         bbox = None
-        if detection and node.get("crop", False) and best_box is not None:
+        # Modified bounding box calculation: always compute bbox if best_box exists
+        if detection and best_box is not None:
             coords = best_box.xyxy[0]
             x1, y1, x2, y2 = map(int, coords)
             h, w = frame.shape[:2]
@@ -114,7 +115,8 @@ def run_pipeline(frame, node: dict, return_bbox: bool = False):
             x2, y2 = min(w, x2), min(h, y2)
             if x2 > x1 and y2 > y1:
                 bbox = (x1, y1, x2, y2)
-                frame = frame[y1:y2, x1:x2]
+                if node.get("crop", False):
+                    frame = frame[y1:y2, x1:x2]
 
         if detection is not None:
             for branch in node["branches"]: