libavcodec/h264_direct.c:433: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264_direct.c:433:29: 
431.                     const int16_t *mv_col = l1mv[x8 * 3 + y8 * 3 * b4_stride];
432.                     if (FFABS(mv_col[0]) <= 1 && FFABS(mv_col[1]) <= 1) {
433.                         if (ref[0] == 0)
                                 ^
434.                             fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2,
435.                                            8, 0, 4);
