How to play sounds using QMediaPlayer

CPPUIX

Audio inputs and output QMediaPlayer and QMediaCaptureSession (and the corresponding QML types MediaPlayer and CaptureSession) are not connected to any audio devices by default. Explicitly connect them to a QAudioInput/AudioInput or QAudioOutput/AudioOutput to capture or play back audio.

You're not doing that in your code and I forgot to mention that I did so in my test; something like:

mediaPlayer.setAudioOutput(new QAudioOutput);

If this still does not fix it, try an absolute path just to verify it's a file access issue or not.

8Observer8

@Abderrahmene_Rayene said in How to play sounds using QMediaPlayer:

new QAudioOutput

Yes, it helped! Thank you very much! Interesting that this didn't work with qrc:// and works with qrc:/

#include "widget.h"
#include <QtCore/QUrl>
#include <QtWidgets/QPushButton>
#include <QtMultimedia/QAudioOutput>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    mediaPlayer.setSource(QUrl("qrc:/assets/audio/music.wav"));
    mediaPlayer.setAudioOutput(new QAudioOutput);

    QPushButton *playButton = new QPushButton("Play", this);
    connect(playButton, &QPushButton::pressed, this, &Widget::play);

    connect(&mediaPlayer, &QMediaPlayer::mediaStatusChanged, this, [this] (QMediaPlayer::MediaStatus status) -> void  {
        qDebug() << "QMediaPlayer::mediaStatusChanged" << status;
    });
}

Widget::~Widget()
{
}

void Widget::play()
{
    mediaPlayer.play();
    qDebug() << "play";
}

JoeCFD

@8Observer8 said in How to play sounds using QMediaPlayer:

connect(&mediaPlayer, &QMediaPlayer::mediaStatusChanged, this, [this] (QMediaPlayer::MediaStatus status) -> void  {
    qDebug() << "QMediaPlayer::mediaStatusChanged" << status;
});

Does the following work?

connect(&mediaPlayer, &QMediaPlayer::mediaStatusChanged, 
        [=](QMediaPlayer::MediaStatus status) -> void{ qDebug() << "QMediaPlayer::mediaStatusChanged" << status;}
       );

8Observer8

@JoeCFD Yes! Thanks a lot!

8Observer8

Hello guys again. I want to rewrite the example above to PySide6 and PyQt6:

from PySide6.QtCore import QUrl
from PySide6.QtMultimedia import QAudioOutput, QMediaPlayer
from PySide6.QtWidgets import QPushButton, QWidget


class Widget(QWidget):
    def __init__(self):
        super().__init__()

        self.mediaPlayer = QMediaPlayer()
        self.mediaPlayer.setSource(QUrl("assets/audio/music.wav"))
        self.mediaPlayer.setAudioOutput(QAudioOutput())
        self.mediaPlayer.mediaStatusChanged.connect(lambda status : print(status))

        playButton = QPushButton("Play", self)
        playButton.clicked.connect(self.play)

    def play(self):
        self.mediaPlayer.play()
        print("play")

main.py

import sys

from PySide6.QtCore import Qt
from PySide6.QtWidgets import QApplication

from widget import Widget

if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec())

But I have these errors:

MediaStatus.InvalidMedia
MediaStatus.LoadingMedia
play
MediaStatus.InvalidMedia

The path to the audio file is correct:

8Observer8

I tried to use fromLocalFile but I have the same result:

self.mediaPlayer.setSource(QUrl.fromLocalFile("assets/audio/music.wav"))

JonB

@8Observer8

QUrl("assets/audio/music.wav")

Test with an absolute path rather than a relative one. Not sure what the current directory is when running Python script, so check this is not the issue?

8Observer8

@JonB I tried, but no, it doesn't work. The result is the same as above

8Observer8

But if I write the wrong path, I get a different error message:

self.mediaPlayer.setSource(QUrl("wrong_path/audio/music.wav"))

handleSourceError: 0x80070003
MediaStatus.InvalidMedia
MediaStatus.LoadingMedia
play
handleSourceError: 0x80070003
MediaStatus.InvalidMedia

8Observer8

I solved the problem! I found the solution here: https://zhuanlan.zhihu.com/p/521028351

        self.audioOutput = QAudioOutput()
        self.mediaPlayer.setAudioOutput(self.audioOutput)