How do you run an image_view node so that it uses compression when consuming data from a usb_cam node?

The usbcam wiki says it "Uses the imagetransport library to allow compressed image transport", so I thought all I had to do was simply specify image_transport:="compression", but that doesn't seem to work.

If I run the standard roslaunch usb_cam usb_cam-test.launch, which runs a usbcam node and a imageview node without compression, that correctly generates a window showing webcam video.

However, if I modify that so that the image_view node explicitly uses compression, with the launch file:

<launch>
  <node name="usb_cam" pkg="usb_cam" type="usb_cam_node" output="screen" >
    <param name="video_device" value="/dev/video0" />
    <param name="image_width" value="640" />
    <param name="image_height" value="480" />
    <param name="pixel_format" value="yuyv" />
    <param name="camera_frame_id" value="usb_cam" />
    <param name="io_method" value="mmap"/>
  </node>
  <node name="image_view" pkg="image_view" type="image_view" respawn="false" output="screen">
    <remap from="image" to="/usb_cam/image_raw"/>
    <param name="autosize" value="true" />
    <param name="image_transport" value="compressed" />
  </node>
</launch>

it runs the usbcam node, but the imageview node immediately exits with just the output:

[ INFO] [1584235215.892228366]: Initializing nodelet with 4 worker threads.
[ INFO] [1584235216.181954413]: Using transport "compressed"

Why is this?