Why is UDP multicast not being broadcast?

Question

ubuntu

Hello everyone!
The task is to receive and play a TV stream from UDP (RTP) multicast on an HTML5 player.
For this, an ubuntu server is organized, on which vlc is installed.
I execute the following command:

vlc -vvv /home/user/video.avi --sout '#standard{access=http,mux=ogg,dst=192.168.0.15:8080}'

and in the VLC player (on Windows) I write
192.168.0.15:8080
and the video is broadcast and played.
Now, it is necessary to broadcast in the same way udp and rtp streams of the form rtp://123.45.67.89:1234 and udp://123.45.67.89:1234 I execute
the following command:

vlc -vvv rtp://@123.45.67.89:1234 --sout '#standard{access=http,mux=ogg,dst=192.168.0.15:8080}'

vlc does not broadcast and swears "core libvlc debug: art not found for rtp://123.45.67.89:1234"