VERTCLOSE         172 libavfilter/vf_xfade.c     {   "vertclose",  "vert close transition",  0, AV_OPT_TYPE_CONST, {.i64=VERTCLOSE},  0, 0, FLAGS, "transition" },
VERTCLOSE        1415 libavfilter/vf_xfade.c     case VERTCLOSE:  s->transitionf = s->depth <= 8 ? vertclose8_transition  : vertclose16_transition;  break;