libavcodec/h264_refs.c:663: error: Integer Overflow L2
  ([0, 1] - 1):unsigned32.

libavcodec/h264_refs.c:663:25: <LHS trace>
661.     h->mmco_index= 0;
662.     if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields
663.         s->broken_link= get_bits1(gb) -1;
                             ^
664.         if(get_bits1(gb)){
665.             h->mmco[0].opcode= MMCO_LONG;

libavcodec/h264_refs.c:663:25: Call
661.     h->mmco_index= 0;
662.     if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields
663.         s->broken_link= get_bits1(gb) -1;
                             ^
664.         if(get_bits1(gb)){
665.             h->mmco[0].opcode= MMCO_LONG;

libavcodec/get_bits.h:230:1: Parameter `s->index`
  228. }
  229. 
  230. static inline unsigned int get_bits1(GetBitContext *s){
       ^
  231.     unsigned int index = s->index;
  232.     uint8_t result = s->buffer[index>>3];

libavcodec/get_bits.h:231:5: Assignment
  229. 
  230. static inline unsigned int get_bits1(GetBitContext *s){
  231.     unsigned int index = s->index;
           ^
  232.     uint8_t result = s->buffer[index>>3];
  233. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/get_bits.h:234:5: Assignment
  232.     uint8_t result = s->buffer[index>>3];
  233. #ifdef ALT_BITSTREAM_READER_LE
  234.     result >>= index & 7;
           ^
  235.     result &= 1;
  236. #else

libavcodec/get_bits.h:235:5: Assignment
  233. #ifdef ALT_BITSTREAM_READER_LE
  234.     result >>= index & 7;
  235.     result &= 1;
           ^
  236. #else
  237.     result <<= index & 7;

libavcodec/get_bits.h:243:5: Assignment
  241.     s->index = index;
  242. 
  243.     return result;
           ^
  244. }
  245. 

libavcodec/h264_refs.c:663:9: Binary operation: ([0, 1] - 1):unsigned32
661.     h->mmco_index= 0;
662.     if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields
663.         s->broken_link= get_bits1(gb) -1;
             ^
664.         if(get_bits1(gb)){
665.             h->mmco[0].opcode= MMCO_LONG;
