No Mp4 Playback on Release Deployment

J.Hilk

I use the windeployqt technique

can you post the command you used ?

celica

Thanks for the replies.
So the command I used was -
cd C:\Qt\5.12.2\msvc2017\bin
windeployqt C:\Users\me\Documents\incommandCopy\Win32\Release

The ListDLLs displays a lot more entries for when the video plays compared to when it doesn't.
Not sure where to start ->

Working - https://easyupload.io/jbbnku
Not Working - https://easyupload.io/2xu2tt

J.Hilk

@celica said in No Mp4 Playback on Release Deployment:

windeployqt C:\Users\me\Documents\incommandCopy\Win32\Release

there you have it, you did not give the tool the path to (your) QMl files -> QML imports are not present

--qmldir

If your application uses Qt Quick, run:
  windeployqt --qmldir <path-to-app-qml-files> <path-to-app-binary>

celica

@J-Hilk Ah I see, thanks. I thought that was definitely the solution
However videos still not playing for the release build.
I ran the following command

windeployqt.exe --qmldir C:\Users\me\Documents\incommand2017\InCommand\Resources C:\Users\me\Documents\incommand2017\Win32\Release

I even then pointed to the entire QML folder, still no luck
windeployqt.exe --qmldir C:\Qt\5.12.2\msvc2017\qml C:\Users\me\Documents\incommand2017\Win32\Release

I'm probably doing something silly here

JKSH

@celica said in No Mp4 Playback on Release Deployment:

Not sure where to start ->

Working - https://easyupload.io/jbbnku
Not Working - https://easyupload.io/2xu2tt

Start by cross-checking the list of Qt DLLs. I've highlighted the ones that were present in your Debug build but not your Release deployment (some of them should now be captured when you use windeployqt with --qmldir):

Working	Not Working
C:\Qt\5.12.2\msvc2017\plugins\bearer\qgenericbearerd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\bearer\qgenericbearer.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qgifd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qgif.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qicnsd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qicns.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qicod.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qico.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qjpegd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qjpeg.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qsvgd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qsvg.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qtgad.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qtga.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qtiffd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qtiff.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qwbmpd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qwbmp.dll
C:\Qt\5.12.2\msvc2017\plugins\imageformats\qwebpd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\imageformats\qwebp.dll
`C:\Qt\5.12.2\msvc2017\plugins\mediaservice\dsengined.dll`
C:\Qt\5.12.2\msvc2017\plugins\platforms\qwindowsd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\platforms\qwindows.dll
C:\Qt\5.12.2\msvc2017\plugins\styles\qwindowsvistastyled.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\styles\qwindowsvistastyle.dll
`C:\Qt\5.12.2\msvc2017\qml\QtQuick\Controls.2\qtquickcontrols2plugind.dll`
`C:\Users\USER\Documents\incommand2017\Win32\Debug\bearer\qnativewifibearerd.dll`
`C:\Users\USER\Documents\incommand2017\Win32\Debug\imageformats\qddsd.dll`
`C:\Users\USER\Documents\incommand2017\Win32\Debug\imageformats\qjp2d.dll`
`C:\Users\USER\Documents\incommand2017\Win32\Debug\imageformats\qmngd.dll`
C:\Users\USER\Documents\incommand2017\Win32\Debug\InCommand.exe	C:\Users\USER\Documents\incommand2017\Win32\Release\InCommand.exe
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5Cored.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5Core.dll
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5Guid.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5Gui.dll
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5Multimediad.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5Multimedia.dll
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5MultimediaWidgetsd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5MultimediaWidgets.dll
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5Networkd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5Network.dll
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5OpenGLd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5OpenGL.dll
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5Qmld.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5Qml.dll
`C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5QuickControls2d.dll`
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5Quickd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5Quick.dll
`C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5QuickTemplates2d.dll`
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5SerialPortd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5SerialPort.dll
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5Svgd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5Svg.dll
C:\Users\USER\Documents\incommand2017\Win32\Debug\Qt5Widgetsd.dll	C:\Users\USER\Documents\incommand2017\Win32\Release\Qt5Widgets.dll
`C:\Users\USER\Documents\incommand2017\Win32\Debug\QtQuick.2\qtquick2plugind.dll`
`C:\Users\USER\Documents\incommand2017\Win32\Debug\QtQuick\Controls.2\qtquickcontrols2plugind.dll`
`C:\Users\USER\Documents\incommand2017\Win32\Debug\QtQuick\Templates.2\qtquicktemplates2plugind.dll`
`C:\Users\USER\Documents\incommand2017\Win32\Debug\QtQuick\Window.2\windowplugind.dll`

See https://wiki.qt.io/Deploy_an_Application_on_Windows for manual deployment. Note that you also need to deploy the qmldir files for the Qt Quick plugins.

celica

@JKSH Thanks for the help
I ended up finding every file missing (there was 110) and moving them all to -:

C:\Users\me\Documents\incommand2017\Win32\Release
And still no mp4 playback when it runs as a release version rather than debug

JKSH

@celica said in No Mp4 Playback on Release Deployment:

I ended up finding every file missing (there was 110) and moving them all

That's too many! You don't need to copy the DLLs from C:\Windows, for example.

And still no mp4 playback when it runs as a release version rather than debug

Did you deploy the qmldir files?
What does ListDLLs show after you've moved the DLLs?

celica

@JKSH
OK thanks, just to be safe I took everything.

The differential is a lot less now. (around 50 files)

Working - https://easyupload.io/9f8zb0
Not working - https://easyupload.io/38ngbq

JKSH

@celica said in No Mp4 Playback on Release Deployment:

just to be safe I took everything.

Don't do that. It can cause crashes if you move system DLLs to a different PC with a slightly different version of Windows.

The differential is a lot less now. (around 50 files)

Working - https://easyupload.io/9f8zb0
Not working - https://easyupload.io/38ngbq

I'm still seeing C:\Windows DLLs that shouldn't be in your deployment folder, like C:\Users\USER\Documents\incommand2017\Win32\Release\WINMM.dll.

Please clean up your build folder (delete everything), build your app from scratch, then deploy ONLY Qt files.

BTW, I'm not seeing plugins\mediaservice\dsengine.dll get loaded. That's the one needed to play videos. One thing to try:

Put plugins\mediaservice\dsengine.dll in your release folder but delete plugins\mediaservice\wmfengine.dll
Put plugins\mediaservice\wmfengine.dll in your release folder but delete plugins\mediaservice\dsengine.dll

celica

@JKSH Tried that, still no luck.
Clean build.
I just have a multimedia folder no plugins folder, don't know if that makes a difference -> \mediaservice\dsengine.dll

I notice during the Listdll for when it works in debug it loads lots of codec files which are not present during the Release run, would this matter?

0x0000000005a70000 0x23c000 C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avutil-lav-56.dll
0x0000000005cb0000 0x49000 C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\libbluray.dll
0x0000000005d00000 0x389000 C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avformat-lav-58.dll
0x0000000006090000 0x1350000 C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avcodec-lav-58.dll
0x00000000073f0000 0x2d000 C:\Program Files (x86)\K-Lite Codec Pack\Filters\LAV\avresample-lav-4.dll

celica

@celica Hi Guys
Still having issues, do you think the lack of codec files deployed during the release build has an effect?

JKSH

@celica said in No Mp4 Playback on Release Deployment:

I just have a multimedia folder no plugins folder, don't know if that makes a difference -> \mediaservice\dsengine.dll

Sorry, The deployment shouldn't have a "plugins" folder. Rephrasing my last post, try:

Put mediaservice\dsengine.dll in your release folder but delete mediaservice\wmfengine.dll
Put mediaservice\wmfengine.dll in your release folder but delete mediaservice\dsengine.dll

Your folder structure should be something like

app.exe
platform\qwindows.dll
mediaservice\dsengine.dll
...

I notice during the Listdll for when it works in debug it loads lots of codec files which are not present during the Release run, would this matter?

Yes, it kind of matters because those codecs are used to play videos. However, you should not deploy those codec DLLs directly. They should be installed on your PC via the codec installer.

Qt loads the codecs via a mediaservice plugin.

celica

@JKSH Thanks, I tried that. You're right dsengine.dll does not get loaded.
In fact nothing does from the mediaservice folder.
Both from the output window within visual studio after a release build and from the Listdll result when it is running.
Is there any way of forcing it to load this file?

I tried removing the files you mention to no avail.
All the codecs were installed via the codec installer.

JKSH

@celica said in No Mp4 Playback on Release Deployment:

In fact nothing does from the mediaservice folder.
Both from the output window within visual studio after a release build

Ah, this is an important clue.

That means it's not a deployment issue. Rather, there's something broken in the Release build. Don't bother trying to deploy until the Release build works fine in Visual Studio.

Try setting the environment variable QT_DEBUG_PLUGINS to 1 before running the app from Visual Studio OR from the command line. What messages do you see when it tries to load plugins?

celica

@JKSH said in No Mp4 Playback on Release Deployment:

QT_DEBUG_PLUGINS

Great, getting closer
I'm not sure how to set that variable as I run the app from within Visual Studio 2017
I tried and got this response does this look right?

[9952] PPLE [Informational] LIFECYCLE: OnResuming
[9952] PPLE [Informational] LIFECYCLE: OnSuspending
[10420] VSMSOUI: Button 'Suspend' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:385) defined by package 'Visual Studio Debugger' ({C9DD4A57-47FB-11D2-83E7-00C04F9902C1}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button 'Resume' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:386) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button 'Suspend and shutdown' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:387) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button 'No Background Tasks' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:388) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:389) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:390) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:391) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:392) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:393) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:394) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:395) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:396) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:397) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:398) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:399) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:400) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:401) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:402) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:403) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:404) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:405) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:406) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:407) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:408) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:409) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:410) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:411) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:412) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:413) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:414) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[10420] VSMSOUI: Button '' ({C9DD4A59-47FB-11D2-83E7-00C04F9902C1}:415) defined by package 'Unknown' ({No Match}) uses icon guidOfficeIcon:746, which is no longer supported 
[9952] PPLE [Informational] LIFECYCLE: OnResuming
[9952] PPLE [Informational] LIFECYCLE: OnSuspending

JKSH

@celica said in No Mp4 Playback on Release Deployment:

I'm not sure how to set that variable as I run the app from within Visual Studio 2017

You could temporarily set it in your PC's global environment. Just remember to un-set it after.

I tried and got this response does this look right?

Unfortunately not. It should look something like this:

QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/5.14.1/msvc2017/plugins/mediaservice" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/5.14.1/msvc2017/plugins/mediaservice/dsengine.dll"
Found metadata in lib C:/Qt/5.14.1/msvc2017/plugins/mediaservice/dsengine.dll, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "directshow"
        ],
        "Services": [
            "org.qt-project.qt.camera",
            "org.qt-project.qt.mediaplayer"
        ]
    },
    "archreq": 0,
    "className": "DSServicePlugin",
    "debug": false,
    "version": 331264
}

"The plugin 'C:/Qt/Online/5.14.1/msvc2017/plugins/mediaservice/dsengine.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin

celica

@JKSH Thanks
I set it within my code using this: qputenv("QT_DEBUG_PLUGINS", QByteArray("1"));
This is what I get:
https://easyupload.io/11rf2k

Note it says defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer
Not sure if this is relevant.

JKSH

@celica said in No Mp4 Playback on Release Deployment:

Note it says defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer
Not sure if this is relevant.

Yes, it's relevant -- it shows that your app has not loaded your mediaservice plugins.

Your QFactoryLoader lines are:

QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/InCommand/mediaservice" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/InCommand/platforms" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/Win32/Release/platforms" ... 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/platforms/qwindows.dll" 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/InCommand/platformthemes" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/Win32/Release/platformthemes" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/InCommand/styles" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/Win32/Release/styles" ... 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/styles/qwindowsvistastyle.dll" 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/InCommand/bearer" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/Win32/Release/bearer" ... 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/bearer/qgenericbearer.dll" 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/InCommand/imageformats" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats" ... 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qgif.dll" 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qicns.dll" 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qico.dll" 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qjpeg.dll" 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qsvg.dll" 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qtga.dll" 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qtiff.dll" 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qwbmp.dll" 
QFactoryLoader::QFactoryLoader() looking at "C:/Users/USER/Documents/incommandnew/Win32/Release/imageformats/qwebp.dll" 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/InCommand/accessible" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/Win32/Release/accessible" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/InCommand/accessiblebridge" ... 
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Documents/incommandnew/Win32/Release/accessiblebridge" ...

You have plugin folders in 2 places. How did this happen? (The folders should only be in 1 place, by the way)
- C:/Users/USER/Documents/incommandnew/platforms/
- C:/Users/USER/Documents/incommandnew/Win32/Release/platforms/
What's in C:/Users/USER/Documents/incommandnew/Win32/Release/mediaservice?

celica

@JKSH Based on your advice I have totally removed all versions of QT (I had two - 5.5 for a legacy project & 5.12.2 for this project)
Now if I run the application from visual studio in release mode it works fine.
Which was your advice to get that working first.
So that's a good first step I think, thanks,
Now I'll try and delpoy it.

celica

This post is deleted!