libavformat/rtpdec_h261.c:124: error: Integer Overflow L2
  ([0, 64] - [0, 64]):unsigned32 by call to `bitstream_skip`.

libavformat/rtpdec_h261.c:123:13: Call
121.             /* ebit/sbit values inconsistent, assuming packet loss */
122.             BitstreamContext bc;
123.             bitstream_init(&bc, buf, len * 8 - ebit);
                 ^
124.             bitstream_skip(&bc, sbit);
125.             if (rtp_h261_ctx->endbyte_bits) {

libavcodec/bitstream.h:84:9: Assignment
  82.         bc->buffer    =
  83.         bc->ptr       = NULL;
  84.         bc->bits_left = 0;
              ^
  85.         return AVERROR_INVALIDDATA;
  86.     }

libavformat/rtpdec_h261.c:124:13: Call
122.             BitstreamContext bc;
123.             bitstream_init(&bc, buf, len * 8 - ebit);
124.             bitstream_skip(&bc, sbit);
                 ^
125.             if (rtp_h261_ctx->endbyte_bits) {
126.                 rtp_h261_ctx->endbyte |= bitstream_read(&bc, 8 - rtp_h261_ctx->endbyte_bits);

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:246:9: Call
  244.     else {
  245.         n -= bc->bits_left;
  246.         skip_remaining(bc, bc->bits_left);
               ^
  247.         if (n >= 64) {
  248.             unsigned skip = n / 8;

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, 64] - [0, 64]):unsigned32 by call to `bitstream_skip` 
    234.     bc->bits <<= n;
    235. #endif
    236.     bc->bits_left -= n;
             ^
    237. }
    238. 
