MODE_TFF           44 libavfilter/vf_interlace.c         AV_OPT_TYPE_INT,   {.i64 = MODE_TFF }, 0, 1, .flags = V, .unit = "scan" },
MODE_TFF           46 libavfilter/vf_interlace.c         AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" },
MODE_TFF          124 libavfilter/vf_interlace.c            s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");
MODE_TFF          201 libavfilter/vf_interlace.c     tff = (s->scan == MODE_TFF);
MODE_TFF           50 libavfilter/vf_setfield.c     {"tff",  "mark as top-field-first",    0, AV_OPT_TYPE_CONST, {.i64=MODE_TFF},  INT_MIN, INT_MAX, FLAGS, "mode"},