void MainWindow::onFormatComboBoxIndexChanged(int AIndex)
{
    QAVOutputFormat format;
    QString name = ui->cmbFormat->itemData(AIndex).toString();
    ui->cmbCodec->clear();

    for (format = QAVOutputFormat::first(); format; ++format)
        if (format.name()==name)
            break;

    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());
    }
    else
        ui->lblFormatName->clear();
}



// Static methods
QAVOutputFormat QAVOutputFormat::first()
{
    return QAVOutputFormat(av_oformat_next(NULL));
}