I needed to switch my project to Qt5 and tried using setMedia and gst:pipeline but that wasn't working for me either. Right now, the pipeline below works as it connects to the camera I need it to and opens the gstreamer output. However, it opens it in a new window and not the Qt Video Widget I am using. I know autovideosink ignores the window overlay, but I tried other sinks and just got a black screen. How could I get this to work? I tried glimagesink which worked for the videotestsrc but it did not work for this.

w->pipeline = gst_parse_launch( "udpsrc port=8000 ! application/x-rtp, encoding-name=H264, payload=109 ! rtph264depay ! h264parse ! queue ! avdec_h264 ! videoconvert ! autovideosink", NULL); /* [4] Set video overlay */ gst_video_overlay_set_window_handle(GST_VIDEO_OVERLAY(w->pipeline), w->getVideoWinID()); /* [5] Run the pipeline */ qDebug() << "------------------------------ Starting pipeline ------------------------------"; GstStateChangeReturn sret = gst_element_set_state(w->pipeline, GST_STATE_PLAYING); if (sret == GST_STATE_CHANGE_FAILURE) { gst_element_set_state(w->pipeline, GST_STATE_NULL); gst_object_unref(w->pipeline); }

Hi,

AFAIK, that's a define.

You want to use GST_DEBUG_DUMP_DOT_DIR.

Note that this requires an active use of the macros like explained there.

Set this environment variable to a path to turn on all GST_DEBUG_BIN_TO_DOT_FILE or GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS calls and have the dot files in that location. This will only work if the application in question makes these calls in strategic places (like when the pipeline state changes or an error occurs). gst-launch-1,0 is one such application.

@hyperlight This is a member pointer defined in the class header in which it is used.
Learn some hungary notation. Some people hate it. I use it, but not strictly.
https://en.wikipedia.org/wiki/Hungarian_notation

You should check the configure logs to see exactly what is failing.

You should also do an out of source build so you can more easily nuke and restart when you change something or you have an error and need to restart.

Hi,

That's rather a question you should bring to the GStreamer folks. For the Qt side you can then use QMediaPlayer as shown here with a custom pipeline.

Rather than giving the pointer to your MainWindow instance, pass directly the pointer to your label. Basically:

mainwindow->ui->label

I have older version of QT5.11.3 and cannot update.
So want solution for this version.

@SGaist I'll try to cross compile qt again and let you know the error .
Meanwhile can you please share any link where i can get the procedure about how to cross compile qt for zynq mpsoc devices.
Thanx.

0_1568024286357_2019-09-09 13-17-33 ekran görüntüsü.png
I have these versions . It does not work when i build directly on raspberry pi .

No, gstreamer is the Linux backend. On Windows, IIRC it's DirectX for the camera access.

I was able to solve the problem where fontconfig was not able to find libexpat by adding the following in my xplatform qmake.conf

QMAKE_LINK = $HOST-g++ -lts -L/opt/qt/qt5.9.1arm/lib -Wl,-rpath -Wl,/opt/qt/qt5.9.1arm/lib QMAKE_LINK_SHLIB= $HOST-g++ -lts -L/opt/qt/qt5.9.1arm/lib -Wl,-rpath -Wl,/opt/qt/qt5.9.1arm/lib

Hi,

Check the version of gstreamer that the plugin uses. It could be 0.1. In that case the quick and dirty way is to install that version of gstreamer with the corresponding plugin packages.

Hope it helps

Whenever I manually use the stop function to stop the video I am getting this error

Depending on your needs, QAudioOutput is rather a lightweight alternative but QMediaPlayer is indeed easier to setup and run.

Glad you found out and thanks for sharing !

@don-prog said:

And what about QQuickItem

You can subclass QQuickItem to create a custom item that you can then use in a Qt Quick scene. In this subclass you can use gstreamer to render a video. So, yes, you can use QQuickItem here. Simply speaking, this is what the Qt Quick Video Item does, too. But please don't ask me how to use gstreamer directly because I have no idea :-)

Hi and welcome to devnet,

QImageReader doesn't depend on GStreamer. GStreamer is used by the QtMultimedia module.