Opening QAudioInput very slow, "could not get audio input for record source 1"

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Hello,

I open a QAudioInput when starting my Qt Widget application on a Samsung Galaxy S3 Mini with Android 4.1.2 using this procedure:
@
m_format.setSampleRate(16000);
m_format.setChannelCount(1);
m_format.setSampleSize(16);
m_format.setCodec("audio/pcm");
m_format.setByteOrder(QAudioFormat::LittleEndian);
m_format.setSampleType(QAudioFormat::SignedInt);
QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice();
if (!info.isFormatSupported(m_format)) {
qWarning() << "Default format not supported, trying to use the nearest.";
m_format = info.nearestFormat(m_format);
}

m_input = new QAudioInput(m_format);
m_input->setBufferSize(384);
m_audioData->open(QIODevice::ReadWrite);

@

It takes very long (approx. 50 secs) for the app to start. Finally it starts and the input is successfully opened. In the console it says:

@
E/AudioRecord(27185): Could not get audio input for record source 1
E/libOpenSLES(27185): android_audioRecorder_realize(0x586115f0) error creating AudioRecord object
W/libOpenSLES(27185): Leaving Object:
E/AudioRecord(27185): Could not get audio input for record source 1
E/libOpenSLES(27185): android_audioRecorder_realize(0x586115f0) error creating AudioRecord object
W/libOpenSLES(27185): Leaving Object::Realize (SL_RESULT_CONTENT_UNSUPPORTED)
@
Is there a mistake in my procedure? I don't know why it takes so long. When i restart the device and start the app it takes the same time.

Thanks!

Regards