MODE_COVER         51 libavfilter/vf_cover_rect.c         { "cover", "cover area with bitmap", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_COVER}, INT_MIN, INT_MAX, FLAGS, "mode" },
MODE_COVER        209 libavfilter/vf_cover_rect.c     if (cover->mode == MODE_COVER) {