MODE_RO            49 libavfilter/f_perms.c         { "ro",     "set all output frames read-only",  0, AV_OPT_TYPE_CONST, {.i64 = MODE_RO},         INT_MIN, INT_MAX, FLAGS, "mode" },
MODE_RO            89 libavfilter/f_perms.c     case MODE_RO:       out_perm = RO;                                      break;