PRESET_INCREASE_CONTRAST   84 libavfilter/vf_curves.c         { "increase_contrast",  NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_INCREASE_CONTRAST},    INT_MIN, INT_MAX, FLAGS, "preset_name" },
PRESET_INCREASE_CONTRAST  123 libavfilter/vf_curves.c     [PRESET_INCREASE_CONTRAST]  = { .master = "0.149/0.066 0.831/0.905 0.905/0.98" },