libavcodec/vc1dec.c:3960: error: Uninitialized Value
  The value read from dmv_x was never initialized.

libavcodec/vc1dec.c:3960:17: 
3958.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
3959.                 }
3960.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);
                      ^
3961.                 vc1_mc_1mv(v, 0);
3962.             }
