SRT Streamer PRO can accept stream from network sources like RTSP-cam, HTTP-services, UDP Multicast stream.
In this mode the app works in "pass-through" mode: it DOES NOT decode/encode. It just wrap original feed to SRT.
For configure network source just edit "networks.ini" file and after refresh Dashboard-page in browser.
networks.ini
add your network sources
For example for add RTSP-cam add this row:
my_cam1 = rtsp://192.168.1.123:554/live/av0
After editing the file, refresh the page so that the streamer re-reads the list of sources.