libavcodec/h264_direct.c:425: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264_direct.c:425:29: 
423.                     const int16_t *mv_col = l1mv[x8 * 3 + y8 * 3 * b4_stride];
424.                     if (FFABS(mv_col[0]) <= 1 && FFABS(mv_col[1]) <= 1) {
425.                         if (ref[0] == 0)
                                 ^
426.                             fill_rectangle(&h->mv_cache[0][scan8[i8 * 4]], 2, 2,
427.                                            8, 0, 4);
