libavcodec/h264_direct.c:447: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264_direct.c:447:33: 
445.                                                      (y8 * 2 + (i4 >> 1)) * b4_stride];
446.                         if (FFABS(mv_col[0]) <= 1 && FFABS(mv_col[1]) <= 1) {
447.                             if (ref[0] == 0)
                                     ^
448.                                 AV_ZERO32(sl->mv_cache[0][scan8[i8 * 4 + i4]]);
449.                             if (ref[1] == 0)
