ROS 2 Foxy - Image Transport Tutorial, example subscriber node does not subscribe to compressed topic when param "_image_transport:=compressed" is set, transport hints for Image Display do not appear in RVIZ.
System: Ubuntu 20.04, Foxy. Using cyclone_dds implementation, all nodes run locally on same PC.
Following packages built from source:
image_common packages: https://github.com/ros-perception/ima...
image_transport_plugins: https://github.com/ros-perception/ima...
image_transport_tutorials: https://github.com/ros-perception/ima...
To stream images from webcam:
ros2 run image_transport_tutorials publisher_from_video 0
To subscribe to images:
ros2 run image_transport_tutorials my_subscriber --ros-args --remap __name:=compressed_listener -p _image_transport:=compressed
Launching RVIZ2:
rviz2
Relevant Information:
rqt_graph screenshot: Subscribing to /camera/image instead of /camera/image/compressed
rviz2 screenshot: No transport hint option for Image RVIZ2 Display
rviz2 does not appear in rqt_graph, despite successfully displaying image
Topics present using "ros2 topic list":
/camera/image
/camera/image/compressed
/camera/image/compressedDepth
/camera/image/theora /clicked_point
/goal_pose /initialpose
/parameter_events /rosout /tf
/tf_static
I am able to run:
ros2 topic bw for /camera/images/compressed
and
ros2 topic hz for /camera/images/compressed
However upon running:
ros2 run rqt_reconfigure rqt_reconfigure
to adjust "camera.image.jpeg.quality", the data rate of /camera/images/compressed does not change as expected (checked using ros2 topic bw for /camera/images/compressed)
