Unsolved QMediaPlayer without output
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Hi All,
I am facing a problem with QMediaPlayer on Windows Server 2013. When my app play a mp3 file. I received an error message :
"QMediaPlayer object does not have a valid service"
There is not output sound. I don't know what exactly is problem here? Missing DLL or something like that. But it is working correctly on other Windows version.
Thanks in advice!
Regards.
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@William.Tran You can try to set QT_DEBUG_PLUGINS (http://doc.qt.io/qt-5/debug.html) before starting your application.
Not sure however why you want to play MP3 on a server :-) -
Is DirectX(DirectShow) installed?
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Thank you for your answers.
@jsulm
I have an application which support to play media files. Everything is working well on Windows 7, 8, 10. But when i install it on Windows Server i got problem. I tried to install QT Creator version 5.7.0 in this Windows Server machine. However, i got the same problem. I could not hear sound when run my application directly from QT. The Media service seems not existing.@Devopia53
No. It is not.Do you have any ideas?
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@William.Tran Can you play sound at all on this server machine?
Also: why do you want to play MP3 on a server? -
Yes, I could play sound on this server machine. I have installed Winamp and tried to play my audio file, It worked.
I would like my application support on Windows server also.
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@William.Tran Did you try what I suggested before (QT_DEBUG_PLUGINS)?
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Could you tell me how to config QT_DEBUG_PLUGINS in application? Sorry i don't know how to use it.
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@William.Tran You don't do it in your application - it is an environment variable. Either set it in the terminal where you start your app or add it in "Projects/Run/Run Environment" in QtCreator.
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I did setting QT_DEBUG_PLUGIN as system variable. Its value is 1. is it correct? I am using Windows Server 2013. Then Could you please tell me how to view the logs file?
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@William.Tran Just execute you app and check its output (in QtCreator "Application Output" tab).
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I received the log informations related to media server :
"The plugin 'C:/Qt/Qt5.7.0/5.7/msvc2013_64/plugins/mediaservice/qtmedia_audioengined.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.7.0/5.7/msvc2013_64/plugins/mediaservice/qtmedia_audioengined.pdb"
"Plugin verification data mismatch in 'C:/Qt/Qt5.7.0/5.7/msvc2013_64/plugins/mediaservice/qtmedia_audioengined.pdb'"
not a plugin
QLibraryPrivate::loadPlugin failed on "C:/Qt/Qt5.7.0/5.7/msvc2013_64/plugins/mediaservice/dsengine.dll" : "Cannot load library C:\Qt\Qt5.7.0\5.7\msvc2013_64\plugins\mediaservice\dsengine.dll: The specified module could not be found."
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"As i can see now, it looks like QT could not load the plugin. Do you have any idea?
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@William.Tran said in QMediaPlayer without output:
Cannot mix debug and release libraries.
This says what the problem is: you're mixing debug and release libraries.
How did you deploy your app?
This plug-in is missing: Cannot load library C:\Qt\Qt5.7.0\5.7\msvc2013_64\plugins\mediaservice*dsengine.dll*: The specified module could not be found."Take a look at http://doc.qt.io/qt-5/windows-deployment.html
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@jsulm
I may have problem with deployment process. But this is the log information when i run my project on QT directly. so i think it should work right?I have checked the DLL in C:\Qt\Qt5.7.0\5.7\msvc2013_64\plugins\mediaservice they are there. But i don't know why they could not be loaded. Is it QT Creator problem ?
I did clean project and run again but still get the same problem. Do you have any suggestion?
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Do you have any ideas? Util now i could not resolve this problem on windows server.
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@William.Tran Are you trying to execute debug or release build?
Did you try to delete the build directory, execute qmake and then build again? -
Besides the log warnings, are you sure the needed backend is in place ?
https://bugreports.qt.io/browse/QTBUG-60376You could run dxdia and see if all is as expected.
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I have tried both of build mode. But it is the same. I also deleted build directory... However i always receive issue above.
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I have installed Winamp in this computer. I can play audio file normally. So i think problem not from device. It comes from QT. How does QT load DLL to combine app?
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@William.Tran Does C:/Qt/Qt5.7.0/5.7/msvc2013_64/plugins/mediaservice/dsengine.dll exist?