QMediaPlayer Fails with linker errors [SOLVED]

[ion_knight]

Below is my code for a very basic player however I am getting a ton of linker errors. Which i have no idea how to solve.

main.cpp
@
#include <QDebug>
#include <QApplication>
#include <QMediaPlayer>
//#include <QVideoWidget>
#include <QtMultimediaWidgets/QVideoWidget>
#include <QVBoxLayout>
#include <QFile>

int main(int argc, char** argv)
{
QApplication app(argc, argv);

QWidget *widget = new QWidget;
widget->resize(400, 300);

QVBoxLayout *layout = new QVBoxLayout;
QMediaPlayer* player = new QMediaPlayer;
QVideoWidget* vw = new QVideoWidget;

layout->addWidget(vw);
widget->setLayout(layout);

player->setVideoOutput(vw);
QFile file("big_buck_bunny_480p_surround-fix.avi");
if(!file.open(QIODevice::ReadOnly))
    qDebug() << "Could not open file";
player->setMedia(QUrl::fromLocalFile&#40;"big_buck_bunny_480p_surround-fix.avi"&#41;&#41;;
player->play();
widget->show();
qDebug() << player->availableMetaData() << player->currentMedia().canonicalUrl();
return app.exec&#40;&#41;;

}
@

RTSP.pro
@#-------------------------------------------------

Project created by QtCreator 2014-07-22T14:42:07

#-------------------------------------------------

QT += core gui multimedia

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = RTSP
TEMPLATE = app

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui@

Any help on how to proceed from here would be great as pretty lost where to go from here.
Thanks

[andreyc]

Could you put some of the error messages here.

[SGaist]

Hi,

You are missing

@QT += multimediawidgets@

In you pro file

[ion_knight]

Ah ok weird that fixed it, don't suppose you can explain why this worked cause I presumed by using:

#include <QtMultimediaWidgets/QVideoWidget>

I thought i didn't have to include it inside the pro file. Don't suppose you have any good links to explain the .pro file, cause I thought it was just another method of include.

[andreyc]

"Here":http://qt-project.org/doc/qt-5/qmake-manual.html is some info about .pro and its "variables":http://qt-project.org/doc/qt-5/qmake-variable-reference.html

There is a qmake line in a C++ class doc that specifies what Qt module to add to "QT":http://qt-project.org/doc/qt-5/qmake-variable-reference.html#qt variable to use the class. For example in "QVideoWidget Class":http://qt-project.org/doc/qt-5/qvideowidget.html