MODE_BFF           49 libavfilter/vf_setparams.c     {"bff",  "mark as bottom-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BFF},  INT_MIN, INT_MAX, FLAGS, "mode"},
MODE_BFF          218 libavfilter/vf_setparams.c     {"bff",  "mark as bottom-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BFF},  INT_MIN, INT_MAX, FLAGS, "mode"},
MODE_BFF           66 libavfilter/vf_tinterlace.c    { "bff",               "bottom field first",                           0, AV_OPT_TYPE_CONST, {.i64 = MODE_BFF}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
MODE_BFF          529 libavfilter/vf_tinterlace.c     if (tinterlace->mode <= MODE_BFF)