libavcodec/mpegvideo_enc.c:3508: error: Uninitialized Value
  The value read from d1[_] was never initialized.

libavcodec/mpegvideo_enc.c:3508:29: 
3506. 
3507.                         if(analyze_gradient){
3508.                             int g= d1[ scantable[i] ];
                                  ^
3509.                             if(g && (g^new_level) >= 0)
3510.                                 continue;
