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build_udp_url(buf, sizeof(buf),
hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
connect);
if (ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
goto fail;
local_rtp_port = ff_udp_get_local_port(s->rtp_hd);
if (local_rtp_port>=0 && local_rtcp_port<0) {
local_rtcp_port = local_rtp_port + 1;
}