libavformat/rtsp.c:1170: error: Integer Overflow R2
  ([0, +oo] + [0, +oo]):signed32 by call to `av_strlcatf`.

libavformat/rtsp.c:1085:1: Parameter `transport.strlen`
1083.  * @return 0 on success, <0 on error, 1 if protocol is unavailable.
1084.  */
1085. static int make_setup_request(AVFormatContext *s, const char *host, int port,
      ^
1086.                               int lower_transport, const char *real_challenge)
1087. {

libavformat/rtsp.c:1170:13: Call
1168.             if (rt->server_type != RTSP_SERVER_REAL)
1169.                 av_strlcat(transport, "unicast;", sizeof(transport));
1170.             av_strlcatf(transport, sizeof(transport),
                  ^
1171.                      "client_port=%d", port);
1172.             if (rt->transport == RTSP_TRANSPORT_RTP &&

libavutil/avstring.c:82:1: <LHS trace>
80. }
81. 
82. size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
    ^
83. {
84.     int len = strlen(dst);

libavutil/avstring.c:82:1: Parameter `size`
  80. }
  81. 
  82. size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
      ^
  83. {
  84.     int len = strlen(dst);

libavutil/avstring.c:88:12: <RHS trace>
86. 
87.     va_start(vl, fmt);
88.     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
               ^
89.     va_end(vl);
90. 

libavutil/avstring.c:88:12: Risky value from: vsnprintf
  86. 
  87.     va_start(vl, fmt);
  88.     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
                 ^
  89.     va_end(vl);
  90. 

libavutil/avstring.c:88:5: Binary operation: ([0, +oo] + [0, +oo]):signed32 by call to `av_strlcatf` 
  86. 
  87.     va_start(vl, fmt);
  88.     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
          ^
  89.     va_end(vl);
  90. 
