@romulovieira-me After further reading...... yes... you probably need to tell the interface on the receiving computer to join the group.
This is useful reading........ https://tldp.org/HOWTO/Multicast-HOWTO-2.html ....
But if you ping 184.108.40.206 from your sending computer you will probably find that r-inspiron3442.local is already a group member (as osc is working).
If that is the case then [streamin~] is the problem as it never makes a request to the os to receive a multicast address.
If the ping is not returned then do a google search for "Linux '(whichever) IGMP" to find out how to join the group.