libavformat/rtsp.c:928: error: Integer Overflow R2
  ([0, +oo] + [0, +oo]):signed32 by call to `av_strlcatf`.

libavformat/rtsp.c:874:1: Parameter `transport.strlen`
872.  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
873.  */
874. static int
     ^
875. make_setup_request (AVFormatContext *s, const char *host, int port,
876.                     int protocol, const char *real_challenge)

libavformat/rtsp.c:928:17: Call
926.                      trans_pref, port);
927.             if (rt->server_type == RTSP_SERVER_RTP)
928.                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
                     ^
929.         }
930. 

libavutil/string.c:68:1: <LHS trace>
66. }
67. 
68. size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
    ^
69. {
70.     int len = strlen(dst);

libavutil/string.c:68:1: Parameter `size`
  66. }
  67. 
  68. size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
      ^
  69. {
  70.     int len = strlen(dst);

libavutil/string.c:74:12: <RHS trace>
72. 
73.     va_start(vl, fmt);
74.     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
               ^
75.     va_end(vl);
76. 

libavutil/string.c:74:12: Risky value from: vsnprintf
  72. 
  73.     va_start(vl, fmt);
  74.     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
                 ^
  75.     va_end(vl);
  76. 

libavutil/string.c:74:5: Binary operation: ([0, +oo] + [0, +oo]):signed32 by call to `av_strlcatf` 
  72. 
  73.     va_start(vl, fmt);
  74.     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
          ^
  75.     va_end(vl);
  76. 
