cannot find -lQtOpenGL and -lGL

Zola

I have problem that I'm missing those two libraries to compile, but mesa-common-dev is installed, what else should I try?

Here is the main.cpp file:

#include "mainwindow.h"
#include <QApplication>
#include <QtMultimediaKit/QMediaPlayer>
#include <QtMultimediaKit/QMediaPlaylist>
#include <QtMultimediaKit/QVideoWidget>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMediaPlayer *player = new QMediaPlayer;

QMediaPlaylist *playlist = new QMediaPlaylist(player);
playlist->addMedia(QUrl("http://example.com/myclip1.mp4"));
playlist->addMedia(QUrl("http://example.com/myclip2.mp4"));

QVideoWidget *videoWidget = new QVideoWidget;
player->setVideoOutput(videoWidget);

videoWidget->show();
playlist->setCurrentIndex(1);
player->play();
//MainWindow w;
//w.show();

return a.exec();

}

and here is my .pro file:

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

Project created by QtCreator 2015-11-25T00:07:36

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

QT += core gui multimedia opengl

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = videoplayer
TEMPLATE = app

INCLUDEPATH += /usr/include/QtMultimediaKit
INCLUDEPATH += /usr/include/QtMobility

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

SGaist

Hi,

Please search the forum a bit, that question has been asked many times already. You are missing the OpenGL dev package e.g. apt-get install libgl1-mesa-dev

Zola

Hey @SGaist I already installed it and problem is the same.

SGaist

What version of Qt are you using ?

Zola

@SGaist Qt 4.8.6 :)

SGaist

Did you re-run qmake after adding QT += opengl ?

If so, how did you install Qt ?

Zola

@SGaist I installed it from source using QtCreator 3.5.1 and Qt 4.8.6 on my Ubuntu 14.04.3 LTS Virtual Machine. I re-run it and it's the same. How to include opengl module when doing ./configure step? Is it required or it is included by default?

SGaist

Since you built it yourself and didn't had the OpenGL dev lib, it was built without. You have to build Qt again (from scratch with a new call to configure). While you're at it, you should consider using 4.8.7.

Zola

@SGaist how to include opengl lib when doing ./configure. I tried ./configure -opengl es2 but I am getting errors.

SGaist

If you installed everything it should be detected automatically. The errors is because you don't have OpenGL es2 installed. But since you're on a desktop just use the desktop OpenGL.

Zola

@SGaist If I am building whole project on Ubuntu desktop machine, should I use -opengl desktop or es2, because I'm building that up for BeagleBone Black?

SGaist

So you're cross-compiling ?

Zola

@SGaist yes, sorry for not telling you that earlier. I need opengl for embedded (BeagleBone Black armhf) but i need to install opengl and write correct paths for embedded opengl in my qmake.conf file.

SGaist

What distribution are you using for that board ? It should provide everything you need (headers + lib) IIRC there's already a mkspec for the BeagleBoard

Zola

@SGaist Debian Wheezy

SGaist

You should take a look at this thread. The poster has provided links to an interesting Wiki to build everything you need before building Qt.