can't see a video play but only music in Qt

[baluk]

Hi,

I want to play a video in my application. But whenever I try to runt he application, I get the message "WARNING: Phonon::createPath: Cannot connect Phonon::MediaObject ( no objectName ) to Phonon::VideoWidget ( no objectName )." And I can hear the music but not video. Here is my code



MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
Phonon::VideoPlayer *player =
new Phonon::VideoPlayer(Phonon::VideoCategory, this);
player->play(QUrl("path"));
player->show();
}

#include <QMainWindow>
#include <phonon/VideoPlayer>
#include <phonon/backendcapabilities.h>
#include <QUrl>
#include <phonon>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;
};


I tried to run the code from http://www.qtcentre.org/threads/30480-Play-video-file-with-Phonon-and-GStreamer-show-black-screen but didn't work. Can any one please tell me what else should be required to play a video.

Thank You,
Baluk

[tbscope]

You have the correct decoder installed?

[baluk]

I am sorry but what decoder I should use. I thought Qt takes the default one that is provided in my windows vista, isn't it so. I don't have much idea about decoder stuff I am trying to find it anyway.

Thank You,
Baluk

[squidge]

Unless you have a codec capable of playing the video, all you'll get is audio.

We can't tell you which decoder to use as we don't know your file format.

[baluk]

I want to play avi, mp3 and mkv format file.

[squidge]

avi and mkv are only containers, what is the file type that you will be playing inside those containers? eg. xvid.

[baluk]

oke. File type is VLC media file.

[squidge]

No, it's not.

That's just the registered player you are using to play the file.

[baluk]

Oke. Now I got to understand what is file format. I want to play avc1 and MPGV codec files.

[squidge]

Install FFDShow

[baluk]

I have it installed on my system. My audio was playing with this codec support only.

[hicham]

http://bugreports.qt.nokia.com/browse/QTBUG-13062

[baluk]

http://bugreports.qt.nokia.com/browse/QTBUG-13062

So according to the link, I can't play a video using Qt 4.7. Is there any other way I could make it possible.

[baluk]

I moved to Qt 4.6.2 and tried to run my application. But I still couldn't succeed. Here I am copying my code. Could any one please check If it is running on your system.



#include <QMainWindow>
#include <phonon/VideoPlayer>
#include <phonon/VideoWidget>
#include <phonon/backendcapabilities.h>
#include <QUrl>
#include <phonon>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow {
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
~MainWindow();

protected:
void changeEvent(QEvent *e);

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

//.CPP file

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

qDebug() << Phonon::BackendCapabilities::availableAudioOutputD evices();

Phonon::MediaObject *mediaObject = new Phonon::MediaObject(this);

Phonon::VideoWidget *videoWidget = new Phonon::VideoWidget(this);
Phonon::createPath(mediaObject, videoWidget);

Phonon::AudioOutput *audioOutput =
new Phonon::AudioOutput(Phonon::VideoCategory, this);
Phonon::createPath(mediaObject, audioOutput);
mediaObject->setCurrentSource(QUrl("file.mkv or .avi"));
connect(mediaObject, SIGNAL(finished()), mediaObject, SLOT(deleteLater()));
mediaObject->play();

}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::changeEvent(QEvent *e)
{
QMainWindow::changeEvent(e);
switch (e->type()) {
case QEvent::LanguageChange:
ui->retranslateUi(this);
break;
default:
break;
}
}

//.pro file

#-------------------------------------------------
#
# Project created by QtCreator 2010-10-10T23:15:17
#
#-------------------------------------------------

QT += opengl phonon multimedia

TARGET = video
TEMPLATE = app


SOURCES += main.cpp\
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

wince*{
DEPLOYMENT_PLUGIN += phonon_ds9 phonon_waveout
}




Thank You,
baluk

[baluk]

Hi,

My problem is solved. Now I can play a video in my Qt app. It was solved when I enable the corresponding decoder in the ffdshow video decoder ( which is responsible for all format video play). Before I was overlooked the issue when running the application.

[somnathbanik]

Hi,

My problem is solved. Now I can play a video in my Qt app. It was solved when I enable the corresponding decoder in the ffdshow video decoder ( which is responsible for all format video play). Before I was overlooked the issue when running the application.

Hi,
I am new to Qt and facing the same issue. I am using windows XP and also install k-Lite codec, but still not working, then I uninstalled that and installed FFDSHOW, do I need to configure anywhere in my system. Please suggest me.

[baluk]

Did you open the ffdshow window and check the available video types and if they are enabled or disabled.

[xairoy]

I tried to play DIVX encoded .avi file. But it is not playing. I have also installed ffdshow and I have checked that DIVX XIDV codecs are enabled. Can somebody help me.

[Chiz]

Hi,

My problem is solved. Now I can play a video in my Qt app. It was solved when I enable the corresponding decoder in the ffdshow video decoder ( which is responsible for all format video play). Before I was overlooked the issue when running the application.

Can you write, where and what did you do to see video?

[mk_researchfellow]

can anybody tell me in ffdshow video decoder what option shud i enable for playing .avi video file.I can only hear the music but no video........