libavcodec/h264.c:1086: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264.c:1086:17: 
1084.                 h->sub_mb_type[i8] = sub_mb_type;
1085. 
1086.                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[0], 1);
                      ^
1087.                 fill_rectangle(&h->ref_cache[1][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[1], 1);
1088.                 if(!IS_INTRA(mb_type_col[y8])
