libavcodec/vc1.c:2538: error: Uninitialized Value
  The value read from i was never initialized.

libavcodec/vc1.c:2538:5: 
2536.         }
2537.     }
2538.     s->block_last_index[n] = i;
          ^
2539. 
2540.     return 0;
