libavcodec/mpegvideo_enc.c:1646: error: Uninitialized Value
  The value read from skip_dct[_] was never initialized.

libavcodec/mpegvideo_enc.c:1646:17: 
1644.         if(!s->chroma_y_shift){ /* 422 */
1645.             if(!skip_dct[6]) get_visual_weight(weight[6], ptr_cb + (dct_offset>>1), wrap_c);
1646.             if(!skip_dct[7]) get_visual_weight(weight[7], ptr_cr + (dct_offset>>1), wrap_c);
                      ^
1647.         }
1648.         memcpy(orig[0], s->block[0], sizeof(DCTELEM)*64*mb_block_count);
