libavcodec/h264.c:1098: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264.c:1098:13: 
1096.             int a=0, b=0;
1097. 
1098.             fill_rectangle(&h->ref_cache[0][scan8[0]], 4, 4, 8, (uint8_t)ref[0], 1);
                  ^
1099.             fill_rectangle(&h->ref_cache[1][scan8[0]], 4, 4, 8, (uint8_t)ref[1], 1);
1100.             if(!IS_INTRA(mb_type_col)
