pkt->duration = av_rescale(samples, st->time_base.den, st->codecpar->sample_rate);
av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64" samples %d sample rate %d\n",
pkt->dts, pkt->duration, samples, st->codecpar->sample_rate);
pkt->duration = av_rescale(samples, st->time_base.den, st->codecpar->sample_rate);
av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64" samples %d sample rate %d\n",
pkt->dts, pkt->duration, samples, st->codecpar->sample_rate);