unable to load audio/qtaudio_windows.dll

[tlexy]

I have two program, A and B, program A has many functionity that use many other library, such as protobuf and fdkaac, program B is very simple, it just detect the audio input device and print the name of it. But when I launch program A, the statement QList<QAudioDeviceInfo> devices = QAudioDeviceInfo::availableDevices(QAudio::AudioInput); devices.size() return zero，it just couldn't detect the audio input device. In program B, the result is 2.
when I run "Process Explorer" to find out what dll they had loaded, I found that the program A didn't load the qtaudio_wasapi.dll and qtaudio_windows.dll (the dll is under the folder "audio"), but the program B loaded the qtaudio_wasapi.dll and qtaudio_windows.dll, I think that's why the program A work incorrectly. but why the program A does't load the qtaudio_wasapi.dll and qtaudio_windows.dll? the program A need that dlls to work correctly.
However, if I copy the two program to other pc to run, the two program both don't load the qtaudio_wasapi.dll and qtaudio_windows.dll, so in other pc, I don't get what I want. I just wander that the program load the Qt5core.dll, Qt5Gui.dll, Qt5Multimedia.dll and so on, but why they don't load the qtaudio_wasapi.dll and qtaudio_windows.dll?
Here is some screenshot:

[tlexy]

now, my application work correctly, it just need add this in the begining of main():
QCoreApplication::addLibraryPath("./");
And then create directory "plugins" in application folder and copy the audio folder to it.

[SGaist]

Hi,

Did you use windeployqt to prepare your application for deployment ?