PRESET_MEDIUM_CONTRAST   87 libavfilter/vf_curves.c         { "medium_contrast",    NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_MEDIUM_CONTRAST},      INT_MIN, INT_MAX, FLAGS, "preset_name" },
PRESET_MEDIUM_CONTRAST  126 libavfilter/vf_curves.c     [PRESET_MEDIUM_CONTRAST]    = { .master = "0.286/0.219 0.639/0.643" },