GEOMETRIC_MEAN     82 libavfilter/vf_deflicker.c         { "gm",      "geometric mean",  0, AV_OPT_TYPE_CONST, {.i64=GEOMETRIC_MEAN},   0, 0, FLAGS, "mode" },
GEOMETRIC_MEAN    350 libavfilter/vf_deflicker.c     case GEOMETRIC_MEAN:  s->get_factor = get_gm_factor;     break;