Qt and gstreamer

raven-worx

@stephane78-0
oh sry...i thought you are talking about the QtMultimedia module

stephane78 0

@raven-worx Hi ,you have perhaps a good idea I will try to compile Qt with gstreamer 1.0 support and I come again back

SGaist

Did you check the winID value ?

stephane78 0

@SGaist Hi,yes xwinId=228589573

stephane78 0

Hi, I have tryed another method with the plugin qmlsink s owith qml but I have a black screen, my code comes from an exemple of the plugin good on github:

int main(int argc, char *argv[])
{
  int ret;

  gst_init (&argc, &argv);

  {
    QGuiApplication app(argc, argv);

    GstElement *pipeline = gst_pipeline_new (NULL);
    //GstElement *src = gst_element_factory_make ("videotestsrc", NULL);
    GstElement *src = gst_element_factory_make ("filesrc","videosrc");
    GstElement *glupload = gst_element_factory_make ("glupload", NULL);
    GstElement *decodebin = gst_element_factory_make("decodebin", NULL);
    /* the plugin must be loaded before loading the qml file to register the
     * GstGLVideoItem qml item */
    GstElement *sink = gst_element_factory_make ("qmlglsink", NULL);

    g_assert (src && glupload && sink);
    g_object_set (G_OBJECT (src), "location", "/home/user/Downloads/small.mp4", NULL);
    gst_bin_add_many (GST_BIN (pipeline), src, decodebin, glupload, sink, NULL);
    gst_element_link_many (src, decodebin, glupload, sink, NULL);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    QQuickItem *videoItem;
    QQuickWindow *rootObject;

    /* find and set the videoItem on the sink */
    rootObject = static_cast<QQuickWindow *> (engine.rootObjects().first());
    videoItem = rootObject->findChild<QQuickItem *> ("videoItem");
    g_assert (videoItem);
    g_object_set(sink, "widget", videoItem, NULL);

    rootObject->scheduleRenderJob (new SetPlaying (pipeline),
        QQuickWindow::BeforeSynchronizingStage);

    ret = app.exec();

    gst_element_set_state (pipeline, GST_STATE_NULL);
    gst_object_unref (pipeline);
  }

  gst_deinit ();

  return ret;

so there is perhaps a problem with my debian 9 or it lacks a library

SGaist

Do you get any error message on the console ?

stephane78 0

@SGaist No there isn't any error message in the console

SGaist

Does it work if you follow GStreamer's Qt example ?

stephane78 0

@SGaist I will try it,because I have modified it to have as source my video.so I will try the example not modified and come here again.

stephane78 0

@SGaist the example without my modifications runs well.so there is something with my filesrc.but I can play my video with gstlaunch and decodebin and xvimagesink.

SGaist

Then I would gradually modify the example until it does play the file you are trying to play with your code.

PeTroVic

Hey @SGaist and @stephane78-0 ,
Did anyone managed to run that example with "filesrc" instead of "videotestsrc" ?

This example works for me, but it uses "videotestsrc" as Source, but I would like to use "filesrc".
Because, I want to be able to use a custom video.

I'm guessing that I need help with GStreamer, and not QT necessarily. But it's worth taking a shot.

RajReddy

you can try:

    MediaPlayer{
        id: playVideo
        source: "gst-pipeline: filesrc location=/home/root/skim-debris.mp4 ! qtdemux ! avdec_h264 ! qtvideosink"
        autoLoad: true
        autoPlay: true
        playbackRate: 1.0
        loops: 10
    }

    VideoOutput {
        anchors.fill: parent
        source: playVideo
    }