libavcodec/h261dec.c:296: error: Integer Overflow L2
  (2 - [`h->s.bc.bits_left`, `h->s.bc.bits_left` + 32]):unsigned32 by call to `bitstream_skip`.

libavcodec/h261dec.c:259:1: Parameter `h->s.bc.bits_left`
257.  * @return <0 if an error occurred
258.  */
259. static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
     ^
260. {
261.     MpegEncContext *const s = &h->s;

libavcodec/h261dec.c:293:21: Call
291.         // 0    1       1s
292.         // *    *       0*
293.         int check = bitstream_peek(&s->bc, 2);
                         ^
294.         i = 0;
295.         if (check & 0x2) {

libavcodec/bitstream.h:215:1: Parameter `n`
  213. /* Return n bits from the buffer, but do not change the buffer state.
  214.  * n has to be in the 0-32 range. */
  215. static inline unsigned bitstream_peek(BitstreamContext *bc, unsigned n)
       ^
  216. {
  217.     if (n > bc->bits_left)

libavcodec/h261dec.c:296:13: Call
294.         i = 0;
295.         if (check & 0x2) {
296.             bitstream_skip(&s->bc, 2);
                 ^
297.             block[0] = (check & 0x1) ? -1 : 1;
298.             i        = 1;

libavcodec/bitstream.h:241:1: <LHS trace>
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: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:241:1: <RHS trace>
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: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:246:9: Binary operation: (2 - [h->s.bc.bits_left, h->s.bc.bits_left + 32]):unsigned32 by call to `bitstream_skip` 
  244.         skip_remaining(bc, n);
  245.     else {
  246.         n -= bc->bits_left;
               ^
  247.         skip_remaining(bc, bc->bits_left);
  248.         if (n >= 64) {
