c->readvid = !c->has_sound;
c->vidpos = avio_tell(pb);
s->start_time = 0;
- s->duration = (int64_t)c->frames * AV_TIME_BASE * num / den;
+ s->duration = av_rescale(c->frames, AV_TIME_BASE * (int64_t)num, den);
av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
return 0;