Lauching via udp:// is no more working

[F1FAQ]

I used to launch mpv.net via a command like "udp://230.0.0.1:5000" to display a video provided by a third-party, but now mpv.net starts but shows nothing (black window).
Calling a video by file is working, only udp call is no more working
PC under Windows 10

[stax76]

Does it work with mpv? How can I reproduce it? I have no experience with udp.