FIELD_UPPER_AND_LOWER  202 libavfilter/vf_tinterlace.c     int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2;
FIELD_UPPER_AND_LOWER  272 libavfilter/vf_tinterlace.c                            FIELD_UPPER_AND_LOWER, 1, FIELD_UPPER, tinterlace->flags);
FIELD_UPPER_AND_LOWER  277 libavfilter/vf_tinterlace.c                            FIELD_UPPER_AND_LOWER, 1, FIELD_LOWER, tinterlace->flags);
FIELD_UPPER_AND_LOWER  302 libavfilter/vf_tinterlace.c                            FIELD_UPPER_AND_LOWER, 1, field, tinterlace->flags);
FIELD_UPPER_AND_LOWER  307 libavfilter/vf_tinterlace.c                            FIELD_UPPER_AND_LOWER, 1, !field, tinterlace->flags);