libavcodec/h264.c:3845: error: Buffer Overrun L3
  Offset added: 256 Size: [0, +oo].

libavcodec/h264.c:3829:1: <Length trace>
3827.  * Replicates H264 "master" context to thread contexts.
3828.  */
3829. static void clone_slice(H264Context *dst, H264Context *src)
      ^
3830. {
3831.     memcpy(dst->block_offset,     src->block_offset, sizeof(dst->block_offset));

libavcodec/h264.c:3829:1: Parameter `src->long_ref[*]`
3827.  * Replicates H264 "master" context to thread contexts.
3828.  */
3829. static void clone_slice(H264Context *dst, H264Context *src)
      ^
3830. {
3831.     memcpy(dst->block_offset,     src->block_offset, sizeof(dst->block_offset));

libavcodec/h264.c:3845:5: Array access: Offset added: 256 Size: [0, +oo]
3843. 
3844.     memcpy(dst->short_ref,        src->short_ref,        sizeof(dst->short_ref));
3845.     memcpy(dst->long_ref,         src->long_ref,         sizeof(dst->long_ref));
          ^
3846.     memcpy(dst->default_ref_list, src->default_ref_list, sizeof(dst->default_ref_list));
3847.     memcpy(dst->ref_list,         src->ref_list,         sizeof(dst->ref_list));
