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app.py

@@ -880,10 +880,11 @@ elif app_mode == 'Test Video Translation':
 
         finally:
             # Clean up resources
-            video_capture.release()
-            if video_writer is not None:
+            if 'video_capture' in locals() and video_capture is not None:
+                video_capture.release()
+            if 'video_writer' in locals() and video_writer is not None:
                 video_writer.close()
-            cv2.destroyAllWindows()
+            # Note: cv2.destroyAllWindows() removed for headless compatibility
 
 # Footer
 st.markdown(