libavformat/http.c:292: error: Integer Overflow R2
  ([0, +oo] + [0, +oo]):signed32 by call to `av_strlcatf`.

libavformat/http.c:267:1: Parameter `headers.strlen`
265. }
266. 
267. static int http_connect(URLContext *h, const char *path, const char *hoststr,
     ^
268.                         const char *auth, int *new_location)
269. {

libavformat/http.c:292:16: Call
290.                           sizeof(headers) - len);
291.     if (!has_header(s->headers, "\r\nRange: "))
292.         len += av_strlcatf(headers + len, sizeof(headers) - len,
                    ^
293.                            "Range: bytes=%"PRId64"\r\n", s->off);
294.     if (!has_header(s->headers, "\r\nConnection: "))

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. 
