tb_unreliable    2959 libavformat/utils.c         if (tb_unreliable(st->codec) && 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    2962 libavformat/utils.c             && tb_unreliable(st->codec)) {
tb_unreliable    3131 libavformat/utils.c             if (!tb_unreliable(st->codec))