libavcodec/mpegvideo_enc.c:1639: error: Uninitialized Value
  The value read from skip_dct[_] was never initialized.

libavcodec/mpegvideo_enc.c:1639:13: 
1637.     if(s->avctx->quantizer_noise_shaping){
1638.         if(!skip_dct[0]) get_visual_weight(weight[0], ptr_y                 , wrap_y);
1639.         if(!skip_dct[1]) get_visual_weight(weight[1], ptr_y              + 8, wrap_y);
                  ^
1640.         if(!skip_dct[2]) get_visual_weight(weight[2], ptr_y + dct_offset    , wrap_y);
1641.         if(!skip_dct[3]) get_visual_weight(weight[3], ptr_y + dct_offset + 8, wrap_y);
