PRESET_NONE        79 libavfilter/vf_curves.c     { "preset", "select a color curves preset", OFFSET(preset), AV_OPT_TYPE_INT, {.i64=PRESET_NONE}, PRESET_NONE, NB_PRESETS-1, FLAGS, "preset_name" },
PRESET_NONE        80 libavfilter/vf_curves.c         { "none",               NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NONE},                 INT_MIN, INT_MAX, FLAGS, "preset_name" },
PRESET_NONE       400 libavfilter/vf_curves.c     if (curves->preset != PRESET_NONE) {