libavcodec/mpegvideo_enc.c:1971: error: Uninitialized Value
  The value read from skip_dct[_] was never initialized.

libavcodec/mpegvideo_enc.c:1971:18: 
1969.                 get_visual_weight(weight[6], ptr_cb + (dct_offset >> 1),
1970.                                   wrap_c);
1971.             if (!skip_dct[7])
                       ^
1972.                 get_visual_weight(weight[7], ptr_cr + (dct_offset >> 1),
1973.                                   wrap_c);
