if (pts != AV_NOPTS_VALUE && s->streams[i]->start_time == AV_NOPTS_VALUE && !ogg->streams[i].got_start) {
s->streams[i]->duration -= pts;
ogg->streams[i].got_start= 1;
if (pts != AV_NOPTS_VALUE && s->streams[i]->start_time == AV_NOPTS_VALUE && !ogg->streams[i].got_start) {
s->streams[i]->duration -= pts;
ogg->streams[i].got_start= 1;