qtspeech on raspberry pi4 , no sound

[stevewu]

I use the qtspeech for qt5.12 with raspbian buster os , raspberry pi4.
but no sound out put ....
raspberry pi 4 can play video, mp3 , by the web online ,or VLC.. ..
I use the 3.5mm headphone.

[SGaist]

Hi,

What is red warning in the application output console about ?

[stevewu]

@SGaist yes , the red warning comes out from console of QtCreator when I run the demo.
do I need to adapt the qtspeech with the audio driver of raspbian? if so , how to do that?

[stevewu]

I think it may be need proper audio driver, could anyone tell me what is the audio dirver of qtspeech on the rasperry pi 4?

[jsulm]

@stevewu Start the app in a terminal after setting QT_DEBUG_PLUGINS

export QT_DEBUG_PLUGINS=1
./hello_speak

and post the output here.

[stevewu]

@jsulm thank you so much , I do as you said ,run the app in a terminal , and it is OK, sound comes out..
I have another question about the qtspeech----how to change the voice , about male , female ,or age ?
maybe I need to open another topic....

[jsulm]

@stevewu https://doc.qt.io/qt-5/qtexttospeech.html#setVoice