libavcodec/h261dec.c:133: error: Integer Overflow L2
  ([0, +oo] - 8):unsigned32 by call to `bitstream_skip`.

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:132:12: Call
130. 
131.     /* GEI */
132.     while (bitstream_read_bit(&s->bc) != 0)
                ^
133.         bitstream_skip(&s->bc, 8);
134. 

libavcodec/bitstream.h:145:1: Parameter `bc->bits_left`
  143. 
  144. /* Return one bit from the buffer. */
  145. static inline unsigned bitstream_read_bit(BitstreamContext *bc)
       ^
  146. {
  147.     if (!bc->bits_left)

libavcodec/bitstream.h:150:12: Call
  148.         refill_64(bc);
  149. 
  150.     return get_val(bc, 1);
                  ^
  151. }
  152. 

libavcodec/bitstream.h:130:1: Parameter `n`
    128. }
    129. 
    130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
         ^
    131. {
    132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:139:5: Assignment
    137.     bc->bits <<= n;
    138. #endif
    139.     bc->bits_left -= n;
             ^
    140. 
    141.     return ret;

libavcodec/h261dec.c:133:9: Call
131.     /* GEI */
132.     while (bitstream_read_bit(&s->bc) != 0)
133.         bitstream_skip(&s->bc, 8);
             ^
134. 
135.     if (s->qscale == 0) {

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_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 unsigned bitstream_read_bit(BitstreamContext *bc)\n{\n    if (!bc->bits_left)\n        refill_64(bc);\n    return get_val(bc, 1);\n}', 'static inline uint64_t get_val(BitstreamContext *bc, unsigned n)\n{\n#ifdef BITSTREAM_READER_LE\n    uint64_t ret = bc->bits & ((UINT64_C(1) << n) - 1);\n    bc->bits >>= n;\n#else\n    uint64_t ret = bc->bits >> (64 - n);\n    bc->bits <<= n;\n#endif\n    bc->bits_left -= n;\n    return ret;\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}']