libavcodec/h261dec.c:185: error: Integer Overflow L2
  ([0, +oo] - 8):unsigned32 by call to `bitstream_skip`.

libavcodec/h261dec.c:179:23: Call
177.                 BitstreamContext bak = s->bc;
178. 
179.                 ret = h261_decode_gob_header(h);
                           ^
180.                 if (ret >= 0)
181.                     return 0;

libavcodec/h261dec.c:119:21: Call
  117. 
  118.     h->gob_number = bitstream_read(&s->bc, 4); /* GN */
  119.     s->qscale     = bitstream_read(&s->bc, 5); /* GQUANT */
                           ^
  120. 
  121.     /* Check if gob_number is valid */

libavcodec/bitstream.h:183:1: Parameter `bc->bits_left`
    181. 
    182. /* Return n bits from the buffer. n has to be in the 0-32 range. */
    183. static inline uint32_t bitstream_read(BitstreamContext *bc, unsigned n)
         ^
    184. {
    185.     if (!n)

libavcodec/h261dec.c:185:13: Call
183.                 s->bc = bak;
184.             }
185.             bitstream_skip(&s->bc, 8);
                 ^
186.         }
187.     }

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

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

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

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

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

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

libavcodec/bitstream.h:237:5: Binary operation: ([0, +oo] - 8):unsigned32 by call to `bitstream_skip` 
    235.     bc->bits <<= n;
    236. #endif
    237.     bc->bits_left -= n;
             ^
    238. }
    239. 

static inline void skip_remaining(BitstreamContext *bc, unsigned n)
{
#ifdef BITSTREAM_READER_LE
    bc->bits >>= n;
#else
    bc->bits <<= n;
#endif
    bc->bits_left -= n;
}
['static int h261_resync(H261Context *h)\n{\n    MpegEncContext *const s = &h->s;\n    int left, ret;\n    if (h->gob_start_code_skipped) {\n        ret = h261_decode_gob_header(h);\n        if (ret >= 0)\n            return 0;\n    } else {\n        if (bitstream_peek(&s->bc, 15) == 0) {\n            ret = h261_decode_gob_header(h);\n            if (ret >= 0)\n                return 0;\n        }\n        s->bc = s->last_resync_bc;\n        bitstream_align(&s->bc);\n        left = bitstream_bits_left(&s->bc);\n        for (; left > 15 + 1 + 4 + 5; left -= 8) {\n            if (bitstream_peek(&s->bc, 15) == 0) {\n                BitstreamContext bak = s->bc;\n                ret = h261_decode_gob_header(h);\n                if (ret >= 0)\n                    return 0;\n                s->bc = bak;\n            }\n            bitstream_skip(&s->bc, 8);\n        }\n    }\n    return -1;\n}', 'static int h261_decode_gob_header(H261Context *h)\n{\n    unsigned int val;\n    MpegEncContext *const s = &h->s;\n    if (!h->gob_start_code_skipped) {\n        val = bitstream_peek(&s->bc, 15);\n        if (val)\n            return -1;\n        bitstream_skip(&s->bc, 16);\n    }\n    h->gob_start_code_skipped = 0;\n    h->gob_number = bitstream_read(&s->bc, 4);\n    s->qscale     = bitstream_read(&s->bc, 5);\n    if (s->mb_height == 18) {\n        if ((h->gob_number <= 0) || (h->gob_number > 12))\n            return -1;\n    } else {\n        if ((h->gob_number != 1) && (h->gob_number != 3) &&\n            (h->gob_number != 5))\n            return -1;\n    }\n    while (bitstream_read_bit(&s->bc) != 0)\n        bitstream_skip(&s->bc, 8);\n    if (s->qscale == 0) {\n        av_log(s->avctx, AV_LOG_ERROR, "qscale has forbidden 0 value\\n");\n        if (s->avctx->err_recognition & AV_EF_BITSTREAM)\n            return -1;\n    }\n    h->current_mba = 0;\n    h->mba_diff    = 0;\n    return 0;\n}', 'static inline uint32_t bitstream_read(BitstreamContext *bc, unsigned n)\n{\n    if (!n)\n        return 0;\n    if (n > bc->bits_left) {\n        refill_32(bc);\n        if (bc->bits_left < 32)\n            bc->bits_left = n;\n    }\n    return get_val(bc, n);\n}', 'static inline void bitstream_skip(BitstreamContext *bc, unsigned n)\n{\n    if (n <= bc->bits_left)\n        skip_remaining(bc, n);\n    else {\n        n -= bc->bits_left;\n        skip_remaining(bc, bc->bits_left);\n        if (n >= 64) {\n            unsigned skip = n / 8;\n            n -= skip * 8;\n            bc->ptr += skip;\n        }\n        refill_64(bc);\n        if (n)\n            skip_remaining(bc, n);\n    }\n}', 'static inline void skip_remaining(BitstreamContext *bc, unsigned n)\n{\n#ifdef BITSTREAM_READER_LE\n    bc->bits >>= n;\n#else\n    bc->bits <<= n;\n#endif\n    bc->bits_left -= n;\n}']