MV_B_FOR           63 libavfilter/vf_codecview.c         CONST("bf", "forward predicted MVs of B-frames",  MV_B_FOR,  "mv"),
MV_B_FOR          271 libavfilter/vf_codecview.c                         (direction == 0 && (s->mv & MV_B_FOR)  && frame->pict_type == AV_PICTURE_TYPE_B) ||