this version of tremor requires a nil check on close_func
https://svn.xiph.org/trunk/Tremor/vorbisfile.c
#include <QApplication>
#include "mainform.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWindow *mainWin = new MyWindow;
mainWin->show();
return app.exec();
}