S3 screens and up in premium mode can handle Multicast streams. In this case you can use and HDMI to IP encoder capable of multicast streaming.
In Magic Info go to Content->New-> Streaming and add a multicast ip and port you set up in the streamer.
This is the format udp://239.x.x.x:8000 or rtp://239.x.x.x:8000
8000 is the port, it is tested and it works.
Then go to schedule and publish just created streaming content. If screens have some content, you can modify current schedule and add additional Ad channel for streaming.
Regards,