SMOOTHLEFT        165 libavfilter/vf_xfade.c     {   "smoothleft", "smoothleft transition",  0, AV_OPT_TYPE_CONST, {.i64=SMOOTHLEFT}, 0, 0, FLAGS, "transition" },
SMOOTHLEFT       1408 libavfilter/vf_xfade.c     case SMOOTHLEFT: s->transitionf = s->depth <= 8 ? smoothleft8_transition : smoothleft16_transition; break;