libavcodec/mpegvideo_enc.c:1655: error: Uninitialized Value
  The value read from skip_dct[_] was never initialized.

libavcodec/mpegvideo_enc.c:1655:17: 
1653.     {
1654.         for(i=0;i<mb_block_count;i++) {
1655.             if(!skip_dct[i]){
                      ^
1656.                 int overflow;
1657.                 s->block_last_index[i] = s->dct_quantize(s, s->block[i], i, s->qscale, &overflow);
