avconv.c:4051: error: Null Dereference
  pointer `today` last assigned on line 4049 could be null and is dereferenced at line 4051, column 69.

avconv.c:4045:1: start of procedure opt_vstats()
4043. }
4044. 
4045. static int opt_vstats(const char *opt, const char *arg)
      ^
4046. {
4047.     char filename[40];

avconv.c:4048:5: 
4046. {
4047.     char filename[40];
4048.     time_t today2 = time(NULL);
          ^
4049.     struct tm *today = localtime(&today2);
4050. 

avconv.c:4049:5: 
4047.     char filename[40];
4048.     time_t today2 = time(NULL);
4049.     struct tm *today = localtime(&today2);
          ^
4050. 
4051.     snprintf(filename, sizeof(filename), "vstats_%02d%02d%02d.log", today->tm_hour, today->tm_min,

avconv.c:4051:5: 
4049.     struct tm *today = localtime(&today2);
4050. 
4051.     snprintf(filename, sizeof(filename), "vstats_%02d%02d%02d.log", today->tm_hour, today->tm_min,
          ^
4052.              today->tm_sec);
4053.     return opt_vstats_file(opt, filename);
