Update app.py

app.py

@@ -8,6 +8,7 @@ from PIL import Image
 from io import BytesIO
 import base64
 import cv2
+import numpy as np
 import queue
 
 # 🌟🔥 Initialize session state like a galactic DJ spinning tracks!
@@ -35,7 +36,7 @@ class CamThread(threading.Thread):
         cam.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)
         cam.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter_fourcc('M', 'J', 'P', 'G'))  # Use MJPG for better USB compatibility
         if not cam.isOpened():
-            st.error(f"🚨 Failed to open {self.preview_name}")
+            st.error(f"🚨 Failed to open {self.preview_name}. Check connection or index.")
             return
 
         while self.running:
@@ -81,6 +82,7 @@ def auto_capture(frame_queues):
 # 🎛️ Sidebar config like a spaceship control panel!
 with st.sidebar:
     st.header("🎚️📸 Snap Shack")
+    frame_queues = [queue.Queue(maxsize=1), queue.Queue(maxsize=1)]  # Define frame_queues here
     if st.button("⏰ Start Auto-Snap"):
         st.session_state['auto_capture_running'] = True
         threading.Thread(target=auto_capture, args=(frame_queues,), daemon=True).start()
@@ -102,7 +104,6 @@ with st.sidebar:
 st.title("📸 OpenCV Snap Craze")
 
 # 📸📷 Start camera threads
-frame_queues = [queue.Queue(maxsize=1), queue.Queue(maxsize=1)]
 threads = [
     CamThread("Camera 0", 0, frame_queues[0]),
     CamThread("Camera 1", 1, frame_queues[1])
@@ -166,7 +167,7 @@ if st.session_state['file_history']:
 else:
     st.write("🕳️ Nothing snapped yet!")
 
-# Cleanup on app exit (not typically needed in Streamlit, but good practice)
+# Cleanup on app exit
 def cleanup():
     for thread in threads:
         thread.stop()