ARITHMETIC_MEAN    81 libavfilter/vf_deflicker.c         { "am",      "arithmetic mean", 0, AV_OPT_TYPE_CONST, {.i64=ARITHMETIC_MEAN},  0, 0, FLAGS, "mode" },
ARITHMETIC_MEAN   349 libavfilter/vf_deflicker.c     case ARITHMETIC_MEAN: s->get_factor = get_am_factor;     break;