RTSP_FLAG_PREFER_TCP   95 libavformat/rtsp.c     { "prefer_tcp", "try RTP via TCP first, if available", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_PREFER_TCP}, 0, 0, DEC|ENC, "rtsp_flags" },
RTSP_FLAG_PREFER_TCP 1917 libavformat/rtsp.c                 && (rt->rtsp_flags & RTSP_FLAG_PREFER_TCP))