libavcodec/mpeg12.c:707: error: Integer Overflow L2
  (1 - [0, 2]):unsigned32.

libavcodec/mpeg12.c:707:21: <RHS trace>
705. {
706.     if (get_bits1(&s->gb))
707.         return 1 - (get_bits1(&s->gb) << 1);
                         ^
708.     else
709.         return 0;

libavcodec/mpeg12.c:707:21: Call
705. {
706.     if (get_bits1(&s->gb))
707.         return 1 - (get_bits1(&s->gb) << 1);
                         ^
708.     else
709.         return 0;

libavcodec/get_bits.h:259:1: Parameter `s->index`
  257. }
  258. 
  259. static inline unsigned int get_bits1(GetBitContext *s)
       ^
  260. {
  261.     unsigned int index = s->index;

libavcodec/get_bits.h:261:5: Assignment
  259. static inline unsigned int get_bits1(GetBitContext *s)
  260. {
  261.     unsigned int index = s->index;
           ^
  262.     uint8_t result = s->buffer[index>>3];
  263. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/get_bits.h:264:5: Assignment
  262.     uint8_t result = s->buffer[index>>3];
  263. #ifdef ALT_BITSTREAM_READER_LE
  264.     result >>= index & 7;
           ^
  265.     result &= 1;
  266. #else

libavcodec/get_bits.h:265:5: Assignment
  263. #ifdef ALT_BITSTREAM_READER_LE
  264.     result >>= index & 7;
  265.     result &= 1;
           ^
  266. #else
  267.     result <<= index & 7;

libavcodec/get_bits.h:276:5: Assignment
  274.     s->index = index;
  275. 
  276.     return result;
           ^
  277. }
  278. 

libavcodec/mpeg12.c:707:9: Binary operation: (1 - [0, 2]):unsigned32
705. {
706.     if (get_bits1(&s->gb))
707.         return 1 - (get_bits1(&s->gb) << 1);
             ^
708.     else
709.         return 0;
