udp_ipv6_resolve_host  171 libavformat/udp.c     res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
udp_ipv6_resolve_host  200 libavformat/udp.c     res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);