MV_B_FOR           53 libavfilter/vf_codecview.c         {"bf", "forward predicted MVs of B-frames",  0, AV_OPT_TYPE_CONST, {.i64 = MV_B_FOR },  INT_MIN, INT_MAX, FLAGS, "mv"},
MV_B_FOR          207 libavfilter/vf_codecview.c                 (direction == 0 && (s->mv & MV_B_FOR)  && frame->pict_type == AV_PICTURE_TYPE_B) ||