Feature/support ipv6

FFMPEG support to fetch resources via IPv6 address by using square blackets notation (e.g. "PROTO://[ADDRESS]:PORT/ENDPOINT" ).

In FFMPEG, this syntax allows us to fetch not only IPv6 but also IPv4 resources in exactly the same fashion. Thus, introducing the square brackets "[, ]" before and after the address fields in the FFMPEG commands also allows the Shinobi's to access IPv6 while keeping the backwards compatibility.