libavcodec/vc1dec.c:1060: error: Uninitialized Value
  The value read from uvmx_field[_] was never initialized.

libavcodec/vc1dec.c:1060:9: 
1058.     for (i = 0; i < 4; i++) {
1059.         off = (i & 1) * 4 + ((i & 2) ? v_dist * s->uvlinesize : 0);
1060.         uvsrc_x = s->mb_x * 8 + (i & 1) * 4 + (uvmx_field[i] >> 2);
              ^
1061.         uvsrc_y = s->mb_y * 8 + ((i & 2) ? v_dist : 0) + (uvmy_field[i] >> 2);
1062.         // FIXME: implement proper pull-back (see vc1cropmv.c, vc1CROPMV_ChromaPullBack())
