YADIF_PARITY_BFF  382 libavfilter/vf_bwdif.c     CONST("bff",  "assume bottom field first", YADIF_PARITY_BFF,  "parity"),
YADIF_PARITY_BFF  207 libavfilter/yadif_common.c     CONST("bff",  "assume bottom field first", YADIF_PARITY_BFF,  "parity"),