void FenPrincipale::startEncode()
{
    QString commandFirstPass = m_pathEncoder + " --profile high --level 4.1 --preset faster --pass 1 --stats m_pathStats --bitrate " + ui->editBitrate->text() + " --threads auto --bframes 3 --b-pyramid normal --me dia  --weightp 0 --ref 1 --subme 1 --direct auto --no-dct-decimate --no-mbtree --partitions none --output NUL " + m_pathAvs;
    QProcess *firstPassProcess = new QProcess(this);
    firstPassProcess->start(commandFirstPass);
    connect(firstPassProcess, SIGNAL(readyReadStandardError()), this, SLOT(readOutput()));
}

void FenPrincipale::readOutput()
{
    qDebug(firstPassProcess->readAllStandardError());
}