libavcodec/h264_direct.c:409: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264_direct.c:409:13: 
407.             fill_rectangle(&h->mv_cache[0][scan8[i8 * 4]], 2, 2, 8, mv[0], 4);
408.             fill_rectangle(&h->mv_cache[1][scan8[i8 * 4]], 2, 2, 8, mv[1], 4);
409.             fill_rectangle(&h->ref_cache[0][scan8[i8 * 4]], 2, 2, 8,
                 ^
410.                            (uint8_t)ref[0], 1);
411.             fill_rectangle(&h->ref_cache[1][scan8[i8 * 4]], 2, 2, 8,
