init_ref          963 libavcodec/motion_est.c     init_ref(c, s->new_picture.data, s->last_picture.data, NULL, 16*mb_x, 16*mb_y, 0);
init_ref         1208 libavcodec/motion_est.c     init_ref(c, s->new_picture.data, s->last_picture.data, NULL, 16*mb_x, 16*mb_y, 0);
init_ref         1601 libavcodec/motion_est.c     init_ref(c, s->new_picture.data, s->last_picture.data, s->next_picture.data, 16*mb_x, 16*mb_y, 2);
init_ref         1843 libavcodec/snow.c         init_ref(c, current_data, s->last_picture[ref].data, NULL, block_w*x, block_w*y, 0);