Feature request: Automatically use ROS compressed image transport

[realdealneil]

Is it possible to use the gstreamer compression capabilities inside of ros in order to publish both an image_raw topic and an image_compressed topic without using too much bandwidth on the TX1 or TX2? I've seen this done (on the Parrot SLAM Dunk board), but it resulted in a bit of a slow down because I don't think they were able to use the gstreamer compression completely (just the ROS compression which isn't nearly as efficient).