libavcodec/h264_direct.c:428: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264_direct.c:428:29: 
426.                             fill_rectangle(&h->mv_cache[0][scan8[i8 * 4]], 2, 2,
427.                                            8, 0, 4);
428.                         if (ref[1] == 0)
                                 ^
429.                             fill_rectangle(&h->mv_cache[1][scan8[i8 * 4]], 2, 2,
430.                                            8, 0, 4);
