libavformat/nutdec.c:489: error: Integer Overflow L1
  ([-oo, -8] - [0, +oo]):unsigned64.

libavformat/nutdec.c:483:30: <LHS trace>
481.     int64_t end, tmp;
482. 
483.     nut->last_syncpoint_pos= avio_tell(bc)-8;
                                  ^
484. 
485.     end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);

libavformat/nutdec.c:483:30: Call
481.     int64_t end, tmp;
482. 
483.     nut->last_syncpoint_pos= avio_tell(bc)-8;
                                  ^
484. 
485.     end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);

libavformat/aviobuf.c:187:9: Assignment
  185. 
  186.     if(!s)
  187.         return AVERROR(EINVAL);
               ^
  188. 
  189.     pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));

libavformat/nutdec.c:483:5: Assignment
481.     int64_t end, tmp;
482. 
483.     nut->last_syncpoint_pos= avio_tell(bc)-8;
         ^
484. 
485.     end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);

libavformat/nutdec.c:489:45: <RHS trace>
487. 
488.     tmp= ff_get_v(bc);
489.     *back_ptr= nut->last_syncpoint_pos - 16*ff_get_v(bc);
                                                 ^
490.     if(*back_ptr < 0)
491.         return -1;

libavformat/nutdec.c:489:45: Call
487. 
488.     tmp= ff_get_v(bc);
489.     *back_ptr= nut->last_syncpoint_pos - 16*ff_get_v(bc);
                                                 ^
490.     if(*back_ptr < 0)
491.         return -1;

libavformat/aviobuf.c:749:5: Assignment
  747. 
  748. uint64_t ff_get_v(AVIOContext *bc){
  749.     uint64_t val = 0;
           ^
  750.     int tmp;
  751. 

libavformat/aviobuf.c:754:9: Assignment
  752.     do{
  753.         tmp = avio_r8(bc);
  754.         val= (val<<7) + (tmp&127);
               ^
  755.     }while(tmp&128);
  756.     return val;

libavformat/aviobuf.c:756:5: Assignment
  754.         val= (val<<7) + (tmp&127);
  755.     }while(tmp&128);
  756.     return val;
           ^
  757. }
  758. 

libavformat/nutdec.c:489:5: Binary operation: ([-oo, -8] - [0, +oo]):unsigned64
487. 
488.     tmp= ff_get_v(bc);
489.     *back_ptr= nut->last_syncpoint_pos - 16*ff_get_v(bc);
         ^
490.     if(*back_ptr < 0)
491.         return -1;
