if (format)
    {
        QList<QAVCodec> encoders = QAVCodec::getCodecs(QAVCodec::Encoder, QAVCodec::MT_Audio);
        for (QList<QAVCodec>::ConstIterator it=encoders.constBegin(); it!=encoders.constEnd(); ++it)
            if (format.queryCodec(*it))
                ui->cmbCodec->addItem((*it).longName(), (*it).id());
        ui->lblFormatName->setText(format.name());
    }