libavcodec/mpegvideo_enc.c:1667: error: Uninitialized Value
  The value read from skip_dct[_] was never initialized.

libavcodec/mpegvideo_enc.c:1667:21: 
1665.         if(s->avctx->quantizer_noise_shaping){
1666.             for(i=0;i<mb_block_count;i++) {
1667.                 if(!skip_dct[i]){
                          ^
1668.                     s->block_last_index[i] = dct_quantize_refine(s, s->block[i], weight[i], orig[i], i, s->qscale);
1669.                 }
