Why is live streaming video source not rendering even though it says it is playing?

I have a media player setup and am trying to stream using both a stream media source and open url nodes in BP. I can stream some files over the internet but cannot get this live video stream to display.

It is an rtsp stream with h.264 encoding.

When I connect the video source using OpenURL node or Stream Media Source it will buffer and says it starts playing (the timer is counting up as well) but nothing is ever rendered to the screen.

This doesn’t make sense to me. The media source matches supported outputs in the technical reference. Media Framework Technical Reference | Unreal Engine Documentation

Are there any things I may be missing? Anything to test or try differently? I can get the stream fine using other programs. Does UE4 not really support rtsp streaming?