1. Using the multicast address can bring your wifi to a screeching halt if you have a decent number of connected devices. The cost scales up with the number of devices, even if they are not receiving. Changing to the direct recipient IP address fixed my wifi problems.
For the sake of completeness, I want to mention that you can use a direct IP address for UDP (Multicast over WiFi can be very resource heavy), and to minimize your latency you will need to run your player with command line options: