bttv_apply_geo
bttv_apply_geo(btv, &set->top->geo, 1);
bttv_apply_geo(btv, &set->bottom->geo,0);
bttv_apply_geo(btv, &set->top->geo,1);
bttv_apply_geo(btv, &set->top->geo,0);
bttv_apply_geo(btv, &set->bottom->geo,1);
bttv_apply_geo(btv, &set->bottom->geo,0);