If you are streaming from your connection then these ports will already be open, the only ones VM block are
TCP & UDP ports 135, 137, 138, 139 – Used by the NetBIOS service
NetBIOS services allow file sharing over a local network. When exposed to the Internet, it can be exploited to carry out malicious activities such as Distributed Denial of Service (DDoS) attacks or to gain unauthorised access to systems on a local network.
TCP & UDP port 445 – Used by the SMB protocol
Port 445 is vulnerable to a number of attacks which target vulnerabilities in systems running file-sharing services. This port is used by various malware strains to gain entry to a network, namely the WannaCry and Nimda malware variants.
I dont work for VirginMedia all opinions are my own. 39 years in IT.