dạ anh ơi, khi chạy lệnh rosrun my_cam image_publisher.py thì máy em báo lỗi như thế này Image is being published to the topic /image_raw ... [ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (1758) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module source reported: Could not read from resource. [ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (888) open OpenCV | GStreamer warning: unable to start pipeline [ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (480) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created Traceback (most recent call last): File "/home/ducmatau/catkin_ws/src/my_cam/image_publisher.py", line 30, in <module> publish_image() File "/home/ducmatau/catkin_ws/src/my_cam/image_publisher.py", line 18, in publish_image rospy.ERROR() TypeError: 'int' object is not callable. Anh cho em hỏi làm thế nào để fix ạ, em cảm ơn