libavcodec/mpegvideo_enc.c:1982: error: Uninitialized Value
  The value read from skip_dct[_] was never initialized.

libavcodec/mpegvideo_enc.c:1982:18: 
1980.     {
1981.         for (i = 0; i < mb_block_count; i++) {
1982.             if (!skip_dct[i]) {
                       ^
1983.                 int overflow;
1984.                 s->block_last_index[i] = s->dct_quantize(s, s->block[i], i, s->qscale, &overflow);
