func: static const char *read_ts(const char *buf, int *ts_start, int *ts_end,
  
                             int *x1, int *y1, int *x2, int *y2)
  
  {
  
      int i, hs, ms, ss, he, me, se;
  
  
  
      for (i=0; i<2; i++) {
  
          /* try to read timestamps in either the first or second line */
  
          int c = sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
  
                         "%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
  
                         &hs, &ms, &ss, ts_start, &he, &me, &se, ts_end,
  
                         x1, x2, y1, y2);
  
          buf += strcspn(buf, "\n") + 1;
  
          if (c >= 8) {
  
              *ts_start = 100*(ss + 60*(ms + 60*hs)) + *ts_start/10;
  
              *ts_end   = 100*(se + 60*(me + 60*he)) + *ts_end  /10;
  
              return buf;
  
          }
  
      }
  
      return NULL;
  
  }
  