av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, NULL);
av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, NULL);