FM_MIRROR         326 libavfilter/vf_fillborders.c     case FM_MIRROR: s->fillborders = s->depth <= 8 ? mirror_borders8 : mirror_borders16; break;
FM_MIRROR         371 libavfilter/vf_fillborders.c         { "mirror", NULL, 0, AV_OPT_TYPE_CONST, {.i64=FM_MIRROR}, 0, 0, FLAGS, "mode" },