No Mp4 Playback on Release Deployment

[JKSH]

@celica said in No Mp4 Playback on Release Deployment:

It's gonna be a pain to convert this player example from working in QT Designer to work in Visual Studio

You don't have to build it in Visual Studio.

1. Build the example in Release mode in Qt Creator.
2. Check that the example runs correctly in Qt Creator.
3. Run windeployqt.
4. Check that the deployed example runs correctly.

[celica]

@JKSH Great, thank you.
So yes I deployed as a release build then used the command
windeployqt.exe C:\Qt\Examples\Qt-5.12.2\multimediawidgets\build-player-Desktop_Qt_5_12_2_MSVC2017_32bit-Release\release

and it works fine.

https://ibb.co/9rSPFtj
See screenshot, what does this tell us?

[celica]

@JKSH Hi Guys
Sorry to bother you again but is there anything else I can try here or am I out of luck?

[JKSH]

@celica said in No Mp4 Playback on Release Deployment:

it works fine.

Hurray! 🎉🎉🎉

what does this tell us?

It tells us that there's nothing wrong with your copy of Qt and nothing wrong with your PC.

So, there might be something wrong with your app. Post your code from main() (Please post the code in the forum; no need to use a file upload service)

[celica]

@JKSH Here is main:
I have also included the cpp file which does most of the heavy lifting as an uploaded file (this is huge) .
https://easyupload.io/02m7h9

#include "incommand.h"
#include <QtWidgets/QApplication>
#include "ButtonManager.h"
#include <QtQuick/QQuickView>
#include <QObject>
#include <QtGlobal>



int main(int argc, char *argv[])
{


	qputenv("QT_DEBUG_PLUGINS", QByteArray("1"));

	QCoreApplication::addLibraryPath(".");
	QApplication application(argc, argv);
	InCommand mainWindow;
	

	QObject::connect(&application, SIGNAL(focusChanged(QWidget*, QWidget*)), &mainWindow, SLOT(focusChanged(QWidget*, QWidget*)));
	mainWindow.setWindowFlags(Qt::FramelessWindowHint | Qt::Window);	//Set borderless window type
#


	QFile styleFile("Resources\\stylesheets\\defaultStyle.css");
	QFile stylenightFile("Resources\\stylesheets\\NightStyleSheet.css");
		
	if (stylenightFile.open(QIODevice::ReadOnly | QIODevice::Text))
	{
		application.setStyleSheet(stylenightFile.readAll());
		stylenightFile.close();
		qDebug() << " -I: Stylesheet loaded OK";
	}
	else
	{
		qDebug() << " -E: Can't access default stylesheet!";
	}


#ifndef TESTING_ON_PC
	application.setOverrideCursor(QCursor(Qt::BlankCursor));
#endif	
	QObject::connect(&application, SIGNAL(aboutToQuit()), &mainWindow, SLOT(appClosing()));

	return application.exec();
}


class MyApi : public QObject
{
	Q_OBJECT
public:
	
		Q_INVOKABLE virtual void setValue(int i);
	
};

[JKSH]

@celica said in No Mp4 Playback on Release Deployment:

QMediaPlayer *player = new QMediaPlayer;
QMediaPlayer *playernew = new QMediaPlayer;

Here is your problem.

You must ensure that QApplication is the very first QObject that is constructed in your app.

However, your QMediaPlayers are initialized statically (in other words, they are initialized outside of a function), which means they can be created before QApplication. When this happens, they look for the mediaservice plugin but they can't find it (because QApplication hasn't loaded it yet), so they give up and they can't play your video.

Go through you entire code base and make sure that you don't have any QObjects that are initialized statically.

QCoreApplication::addLibraryPath(".");

This line is not necessary. Remove it.

(To understand why, read https://doc.qt.io/qt-5/qcoreapplication.html#libraryPaths )

[celica]

@JKSH Thanks so much. This is great.
It is now loading the files previously it was not loading i.e.

incommandnew\Win32\Release\mediaservice\dsengine.dll

Plus the codecs it is now loading.

0x000000005d520000  0x8a000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\LAVSplitter.ax

0x000000005bc00000  0x23c000  C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avutil-lav-56.dll
0x000000005bbb0000  0x49000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\libbluray.dll
0x000000005be40000  0x389000  C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avformat-lav-58.dll
0x000000005c1d0000  0x1350000  C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avcodec-lav-58.dll
0x000000005bb80000  0x2d000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avresample-lav-4.dll

The video is still not playing however when it is deployed.

[JKSH]

Great progress!

@celica said in No Mp4 Playback on Release Deployment:

The video is still not playing however when it is deployed.

Then it's time to start debugging your app.

Back up your code (using source control, like Git, is best). After that, keep removing large blocks of code from your app and keep retrying the deployment until your problem disappears.

[celica]

@JKSH Just to close this thread
The issue was the videos were not getting deployed.
I need to add these as "Additional Files to Deploy" within the Debugging configuration page of VS
Once these mp4 files were deployed everything worked.
Thanks for all your help

[JKSH]

@celica Awesome. Happy coding!