QMediaPlayer卡在加载介质上

Question

我想要播放一个音频文件(经过测试的.wav、.mp3、.flac)，使用QMediaPlayer在带有Yocto系统的嵌入式iMX8设备上使用控制台应用程序。我正在测试来自Qt医生的代码。它在PC上工作很好，但在嵌入式设备上就不行了。它坚持使用Media Status: QMediaPlayer::LoadingMedia，没有任何错误。我猜这是系统里的东西。从控制台播放媒体，可以使用aplay命令。什么能成为理由？我怎么才能修好它？

    QMediaPlayer *player = new QMediaPlayer;
    QObject::connect(player, &QMediaPlayer::positionChanged, [=](qint64 position){
        qDebug()<< "Current position: " << position;
    });
    QObject::connect(player, &QMediaPlayer::mediaStatusChanged, [=](QMediaPlayer::MediaStatus status){
        qDebug()<< "Media Status: " << status;
    });
    player->setMedia(QUrl::fromLocalFile("/home/root/test.wav"));
    player->setVolume(100);
    player->play();

我尝试过在我的平台上调试Qt插件，但是我没有发现任何问题。

QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/plugins/mediaservice" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/plugins/mediaservice/libgstaudiodecoder.so"
Found metadata in lib /usr/lib/plugins/mediaservice/libgstaudiodecoder.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreameraudiodecode"
        ],
        "Services": [
            "org.qt-project.qt.audiodecode"
        ]
    },
    "archreq": 0,
    "className": "QGstreamerAudioDecoderServicePlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("gstreameraudiodecode")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/plugins/mediaservice/libgstcamerabin.so"
Found metadata in lib /usr/lib/plugins/mediaservice/libgstcamerabin.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamercamerabin"
        ],
        "Services": [
            "org.qt-project.qt.camera"
        ]
    },
    "archreq": 0,
    "className": "CameraBinServicePlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("gstreamercamerabin")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/plugins/mediaservice/libgstmediacapture.so"
Found metadata in lib /usr/lib/plugins/mediaservice/libgstmediacapture.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamermediacapture"
        ],
        "Services": [
            "org.qt-project.qt.audiosource"
        ]
    },
    "archreq": 0,
    "className": "QGstreamerCaptureServicePlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("gstreamermediacapture")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/plugins/mediaservice/libgstmediaplayer.so"
Found metadata in lib /usr/lib/plugins/mediaservice/libgstmediaplayer.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamermediaplayer"
        ],
        "Services": [
            "org.qt-project.qt.mediaplayer"
        ]
    },
    "archreq": 0,
    "className": "QGstreamerPlayerServicePlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("gstreamermediaplayer")
QFactoryLoader::QFactoryLoader() checking directory path "/opt/platform-benchmark_app/bin/mediaservice" ...
loaded library "/usr/lib/plugins/mediaservice/libgstmediaplayer.so"
QMediaPluginLoader: loaded plugins for key "org.qt-project.qt.mediaplayer" : ("gstreamermediaplayer")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/plugins/resourcepolicy" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/platform-benchmark_app/bin/resourcepolicy" ...

Answer 1

问题在于系统映像和缺少gStreer1.0数据包。它单独工作，但它不适用于Qt多媒体。解决方案是在fsl映像食谱中添加数据包组、gstreamer1.0-full、gStreamer1.0、和。

CORE_IMAGE_EXTRA_INSTALL += " \
...
packagegroup-fsl-gstreamer1.0 \
packagegroup-fsl-gstreamer1.0-full \
...
"