libavcodec/h264.c:3970: error: Buffer Overrun L3
  Offset: [-1, +oo] Size: 16 by call to `execute_decode_slices`.

libavcodec/h264.c:3755:9: Assignment
3753.     for(;pass <= 1;pass++){
3754.         buf_index = 0;
3755.         context_count = 0;
              ^
3756.         next_avc = h->is_avc ? 0 : buf_size;
3757.         nal_index = 0;

libavcodec/h264.c:3970:13: Call
3968. 
3969.         if(context_count == h->max_contexts) {
3970.             execute_decode_slices(h, context_count);
                  ^
3971.             context_count = 0;
3972.         }

libavcodec/h264.c:3700:1: <Offset trace>
3698.  * @param context_count number of contexts to execute
3699.  */
3700. static int execute_decode_slices(H264Context *h, int context_count){
      ^
3701.     MpegEncContext * const s = &h->s;
3702.     AVCodecContext * const avctx= s->avctx;

libavcodec/h264.c:3700:1: Parameter `context_count`
  3698.  * @param context_count number of contexts to execute
  3699.  */
  3700. static int execute_decode_slices(H264Context *h, int context_count){
        ^
  3701.     MpegEncContext * const s = &h->s;
  3702.     AVCodecContext * const avctx= s->avctx;

libavcodec/h264.c:3700:1: <Length trace>
3698.  * @param context_count number of contexts to execute
3699.  */
3700. static int execute_decode_slices(H264Context *h, int context_count){
      ^
3701.     MpegEncContext * const s = &h->s;
3702.     AVCodecContext * const avctx= s->avctx;

libavcodec/h264.c:3700:1: Parameter `h->thread_context[*]`
  3698.  * @param context_count number of contexts to execute
  3699.  */
  3700. static int execute_decode_slices(H264Context *h, int context_count){
        ^
  3701.     MpegEncContext * const s = &h->s;
  3702.     AVCodecContext * const avctx= s->avctx;

libavcodec/h264.c:3721:14: Array access: Offset: [-1, +oo] Size: 16 by call to `execute_decode_slices` 
  3719. 
  3720.         /* pull back stuff from slices to master context */
  3721.         hx = h->thread_context[context_count - 1];
                     ^
  3722.         s->mb_x = hx->s.mb_x;
  3723.         s->mb_y = hx->s.mb_y;
