tb_unreliable    3427 libavformat/utils.c         if (tb_unreliable(st->internal->avctx) && st->info->duration_count > 15 && st->info->duration_gcd > FFMAX(1, st->time_base.den/(500LL*st->time_base.num)) && !st->r_frame_rate.num)
tb_unreliable    3430 libavformat/utils.c             && tb_unreliable(st->internal->avctx)) {
tb_unreliable    3761 libavformat/utils.c             if (!tb_unreliable(st->internal->avctx))