PRESET_NEGATIVE    88 libavfilter/vf_curves.c         { "negative",           NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NEGATIVE},             INT_MIN, INT_MAX, FLAGS, "preset_name" },
PRESET_NEGATIVE   127 libavfilter/vf_curves.c     [PRESET_NEGATIVE]           = { .master = "0/1 1/0" },