libavcodec/vc1dec.c:3957: error: Uninitialized Value
  The value read from pred_flag was never initialized.

libavcodec/vc1dec.c:3957:13: 
3955.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);
3956.             }
3957.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);
                  ^
3958.             vc1_mc_1mv(v, 0);
3959.             mb_has_coeffs = !(idx_mbmode & 2);
