QtGstreamer camerabin2 用法

QtGstreamer camerabin2 usage

我正在开发 olimex a13 开发板,只有 eglfs,即没有窗口系统。由于这个 Qt Multimedia 东西,视频和相机无法正常工作,因为 Qt 使用 Gstreamer,而后者又需要 X。所以我正在使用 QtGstreamer 库,它是 here.

我关注了examples and created a media player which is working as expected. Now, I want to do a camera and using camerabin2 which is from bad plugins

这是我的代码:

//init QGst
QGst::init(&argc, &argv);
//create video surface
QGst::Quick::VideoSurface* videoSurface = new QGst::Quick::VideoSurface(&engine);

CameraPlayer player;
player.setVideoSink(videoSurface->videoSink());

//cameraplayer.cpp

void open() 
{
    if (!m_pipeline) {
        m_pipeline = QGst::ElementFactory::make("camerabin").dynamicCast<QGst::Pipeline>();
        if (m_pipeline) {
            m_pipeline->setProperty("video-sink", m_videoSink);
            //watch the bus for messages
            QGst::BusPtr bus = m_pipeline->bus();
            bus->addSignalWatch();
            QGlib::connect(bus, "message", this, &CameraPlayer::onBusMessage);
            //QGlib::connect(bus, "image-done", this, &CameraPlayer::onImageDone);
        } else {
            qCritical() << "Failed to create the pipeline";
        }
    }
}
//-----------------------------------
void CameraPlayer::setVideoSink(const QGst::ElementPtr & sink)
{
    m_videoSink = sink;
}

//-----------------------------------
void CameraPlayer::start()
{
    m_pipeline->setState(QGst::StateReady);
    m_pipeline->setState(QGst::StatePlaying);
}

然后我调用 cameraPlayer.start(),但它不起作用,即没有视频。我在这里错过了什么吗?有没有人使用 QtGstreamer 流式传输网络摄像头?提前致谢。

我意识到缺少一些插件 (multifilesink)。使用 --gst-debug-level=4 参数启动我的 Qt 应用程序,然后 gstreamer 报告缺少插件。