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Hi, I have trouble trying to use ar_track_alvar with usb_node. Don't know if you can help, but I did not find any other discussion about that... When I launch the node I get that :

core service [/rosout] found process[ar_track_alvar-1]: started with pid [1819] [ar_track_alvar-1] process has died [pid 1819, exit code -11, cmd /home/viki/ros_workspace/ar_track_alvar/bin/individualMarkersNoKinect 4.4 0.08 0.2 /usb_cam/image_raw /usb_cam/camera_info /torso_lift_link __name:=ar_track_alvar __log:=/home/viki/.ros/log/89dacf3e-34ac-11e2-9ff4-00031d09cf22/ar_track_alvar-1.log]. log file: /home/viki/.ros/log/89dacf3e-34ac-11e2-9ff4-00031d09cf22/ar_track_alvar-1*.log all processes on machine have died, roslaunch will exit shutting down processing monitor... ... shutting down processing monitor complete done

Did you have problems using it at the beginning ?

Thanks a lot