No Mp4 Playback on Release Deployment

[celica]

@JKSH So the only difference between when it works and when it doesn't (in terms of the QT dlls, I have ignored all windows system files) are the following are omitted when it fails to work correctly but are included when it works.
I wonder why it fails to load anything located in the mediaservice folder

0x0000000079c20000  0x42000   C:\Qt\5.12.2\msvc2017\plugins\mediaservice\dsengine.dll
0x000000007a650000  0x8a000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\LAVSplitter.ax
0x000000007a6e0000  0x23c000  C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avutil-lav-56.dll
0x000000007bcc0000  0x389000  C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avformat-lav-58.dll
0x000000007bc70000  0x49000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\libbluray.dll
0x0000000003f60000  0x1350000  C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avcodec-lav-58.dll
0x000000007c050000  0x2d000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avresample-lav-4.dll
0x000000007c090000  0x104000  C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\LAVVideo.ax
0x000000007c1a0000  0x37000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avfilter-lav-7.dll
0x000000007c1e0000  0x94000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\swscale-lav-5.dll
0x000000007c280000  0x1d2000  C:\Program Files (x86)\K-Lite Codec Pack\Filters\DirectVobSub\vsfilter.dll
0x000000007c700000  0x44000   C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\LAVAudio.ax

[JKSH]

@celica said in No Mp4 Playback on Release Deployment:

@JKSH So the only difference between when it works and when it doesn't (in terms of the QT dlls, I have ignored all windows system files) are the following are omitted when it fails to work correctly but are included when it works.

Yep, that's what I found too.

I wonder why it fails to load anything located in the mediaservice folder

It's very strange... as far as I can tell, all your DLLs are in the right place.

Just as a sanity check, could you try to build the "Media Player Example" (https://doc.qt.io/qt-5/qtmultimedia-multimediawidgets-player-example.html ) and deploy that? Does that work?

I believe you can find the example in C:\Qt\Examples\Qt-5.14.1\multimediawidgets\player\

If that doesn't work, try uninstalling the K-Lite Codec Pack.

[celica]

@JKSH Tried removing codecs no luck - went through my code to see if anything was amiss. Looks ok.
Did a build from a completely different PC and the same thing happens - fresh installs of VS 2017 & Q 5.12.2

I can run the multimedia player ok - from within QT creator.
Do I need to deploy this example?
The deploy option is greyed out.

[JKSH]

@celica said in No Mp4 Playback on Release Deployment:

Do I need to deploy this example?
The deploy option is greyed out.

The idea is to use windeployqt to produce a deployment that can play videos.

This is to check if the problem is in your code or not.

[celica]

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

[mrjj]

@celica
Hi
Just as a note.
There is a Qt plugin for Visual Studio that allows the use of UI files
so nothing needs to be converted.

[celica]

@mrjj Yes, I have that but I'm getting lots of errors when for nearly all of the header includes
visual studio cannot open source QApplication

[mrjj]

@celica
Ok, it does sound like something in the setup didn't went all well.
Normally it just works and you can right click an UI files and it opens Designer.
So while not as good integration as in Creator it should compile fine.

[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!