Can't play sound.

architect23

Hello, I have problem with playing sound.I have code:

QMediaPlayer *player = new QMediaPlayer(this, QMediaPlayer::StreamPlayback);
    QUrl file = QUrl::fromLocalFile("C:/Users/Downloads/Telegram Desktop/123.mp3");
    player->setMedia(file);
    player->setVolume(99);
    player->play();

But sound don't work. I make new compile: plugins.pro(new Qt5Multimediad.dll, new wmfengined.dll, new dsengined.dll) but I have message in my app:
Cannot load library C:\qt2\5.15.2\msvc2019_64\plugins\mediaservice\dsengined.dll: The specified module could not be found.
QLibraryPrivate::loadPlugin failed on "C:/qt2/5.15.2/msvc2019_64/plugins/mediaservice/dsengined.dll" : "Cannot load library C:\qt2\5.15.2\msvc2019_64\plugins\mediaservice\dsengined.dll: The specified module could not be found."
Cannot load library C:\qt2\5.15.2\msvc2019_64\plugins\mediaservice\wmfengined.dll: The specified module could not be found.
QLibraryPrivate::loadPlugin failed on "C:/qt2/5.15.2/msvc2019_64/plugins/mediaservice/wmfengined.dll" : "Cannot load library C:\qt2\5.15.2\msvc2019_64\plugins\mediaservice\wmfengined.dll: The specified module could not be found."
QMediaPluginLoader: loaded plugins for key "org.qt-project.qt.mediaplayer" : ("directshow")
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"
What is wrong?

jsulm

@architect23 said in Can't play sound.:

What is wrong?

Did you check whether those DLLs are there or not?
How did you install Qt?

"I make new compile: plugins.pro(new Qt5Multimediad.dll, new wmfengined.dll, new dsengined.dll)" - what does "new" mean here? What did you change?

You should also add error handling to your app (https://doc.qt.io/qt-5/qmediaplayer.html#error-1).

architect23

1)Of course I checked exist dll in "C:\qt2\5.15.2\msvc2019_64\plugins\mediaservice"
2)I downloaded offline installer 5.15.2
3)I built new dll and reversed they in path "C:\qt2\5.15.2\msvc2019_64\plugins\mediaservice"

architect23

@jsulm I have :
QMediaPlayer::ServiceMissingError 5 A valid playback service was not found, playback cannot proceed.

jsulm

@architect23 said in Can't play sound.:

I built new dll

Why?

architect23

@jsulm because I read it on dif website

jsulm

@architect23 I still do not understand this: why do you think you need to built new DLLs?

architect23

@jsulm because i saw, that my project did't see dlls

architect23

@jsulm Can you tell me what i must do? :)

KroMignon

@architect23 said in Can't play sound.:

because i saw, that my project did't see dlls

What do you mean with this?
To use QMediaPlayer, you have to enable multimedia libraries in your project by adding QT += multimedia in your PRO file.

architect23

@KroMignon of course I did it:

QT       += core gui multimedia

BronnyYee

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