libavcodec/mpegvideo_enc.c:1963: error: Uninitialized Value
  The value read from skip_dct[_] was never initialized.

libavcodec/mpegvideo_enc.c:1963:14: 
1961.         if (!skip_dct[3])
1962.             get_visual_weight(weight[3], ptr_y + dct_offset + 8, wrap_y);
1963.         if (!skip_dct[4])
                   ^
1964.             get_visual_weight(weight[4], ptr_cb                , wrap_c);
1965.         if (!skip_dct[5])
