libavformat/oggparsetheora.c:69: error: Integer Overflow L2
  ([0, +oo] - 56):unsigned32 by call to `bitstream_skip`.

libavformat/oggparsetheora.c:66:9: Call
64.         AVRational timebase;
65. 
66.         bitstream_init8(&bc, os->buf + os->pstart, os->psize);
            ^
67. 
68.         /* 0x80"theora" */

libavcodec/bitstream.h:103:1: Parameter `bc->bits_left`
  101. 
  102. /* Initialize BitstreamContext with buffer size in bytes instead of bits. */
  103. static inline int bitstream_init8(BitstreamContext *bc, const uint8_t *buffer,
       ^
  104.                                   unsigned byte_size)
  105. {

libavformat/oggparsetheora.c:69:9: Call
67. 
68.         /* 0x80"theora" */
69.         bitstream_skip(&bc, 7 * 8);
            ^
70. 
71.         thp->version = bitstream_read(&bc, 24);

libavcodec/bitstream.h:240:1: Parameter `n`
  238. 
  239. /* Skip n bits in the buffer. */
  240. static inline void bitstream_skip(BitstreamContext *bc, unsigned n)
       ^
  241. {
  242.     if (n < bc->bits_left)

libavcodec/bitstream.h:243:9: Call
  241. {
  242.     if (n < bc->bits_left)
  243.         skip_remaining(bc, n);
               ^
  244.     else {
  245.         n -= bc->bits_left;

libavcodec/bitstream.h:229:1: <LHS trace>
227. }
228. 
229. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
     ^
230. {
231. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:229:1: Parameter `bc->bits_left`
    227. }
    228. 
    229. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
         ^
    230. {
    231. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:229:1: <RHS trace>
227. }
228. 
229. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
     ^
230. {
231. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:229:1: Parameter `n`
    227. }
    228. 
    229. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
         ^
    230. {
    231. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:236:5: Binary operation: ([0, +oo] - 56):unsigned32 by call to `bitstream_skip` 
    234.     bc->bits <<= n;
    235. #endif
    236.     bc->bits_left -= n;
             ^
    237. }
    238. 
