libavcodec/mpegvideo_enc.c:1997: error: Uninitialized Value
  The value read from skip_dct[_] was never initialized.

libavcodec/mpegvideo_enc.c:1997:22: 
1995.         if (s->avctx->quantizer_noise_shaping) {
1996.             for (i = 0; i < mb_block_count; i++) {
1997.                 if (!skip_dct[i]) {
                           ^
1998.                     s->block_last_index[i] =
1999.                         dct_quantize_refine(s, s->block[i], weight[i],
