I've got some code that starts mencoder in a QProcess, converts a video while displaying a progress bar, then exits. The problem is, mencoder always exits before it's actually finished. The loop runs through a few times, and then closes. If I comment out the line that updates the progress bar (progress.setValue()), mencoder runs to completion and exits happily.
Been at this for a day, and can't figure it out! Also, I should mention I'm on a Mac.
Any ideas?
Thanks
Marlon
void MainWindow::convertVideo()
{
QString input_filename = "/var/input.avi";
QString output_filename = "/var/output.264";
QStringList arguments;
arguments << input_filename << "-nosound" << "-of" << "rawvideo" << "-ofps" << "30" << "-vf" << "harddup" << "-ovc" << "x264" << "-x264encopts" << "bframes=0" << "-o" << output_filename;
QProcess* myProcess = new QProcess(this);
myProcess->setReadChannel(QProcess::StandardOutput);
myProcess->start("/opt/local/bin/mencoder", arguments);
QString output_string;
QStringList output_pieces;
QProgressDialog progress("Converting video...", "Abort", 0, 100, this);
progress.setWindowModality(Qt::WindowModal);
progress.setValue(0);
progress.show();
while(myProcess->state() != QProcess::NotRunning)
{
output_string = myProcess->readAllStandardOutput();
output_pieces = output_string.split(" ");
QStringList width_string_list = output_pieces.filter("%)");
if(width_string_list.length() > 0)
{
width_string_list = width_string_list[width_string_list.length() - 1].split("(");
if(width_string_list.length() > 1)
{
width_string_list = width_string_list[1].split("%");
}
else
{
width_string_list = width_string_list[0].split("%");
}
progress.setValue(width_string_list[0].toInt());
qDebug() << width_string_list[0].toInt();
}
myProcess->waitForReadyRead();
}
return;
}