Then your package manager provides EOL-software!
You can download later versions via the link in @Christian-Ehrlicher's signature.

@AROH 1.16.1 is pretty old and has more memory leaks if vaapi for intel card is applied.
I am using gstreamer 1.22.5 + Qt 5.15.2 in Ubuntu 22.04.
However, your problem may be related to missing lib or plugins. Set GST_DEBUG level to see what is wrong.
https://gstreamer.freedesktop.org/documentation/tutorials/basic/debugging-tools.html?gi-language=c

@SeeRich
can you change

setAttribute(Qt::WA_StyledBackground); setObjectName( "mainWindow" ); setStyleSheet( QString( "MainWindow#%1 { background-color: blue; }" ) .arg( objectName() );

to

setAttribute(Qt::WA_StyledBackground); setObjectName( "mainWindow" ); setStyleSheet( QString( "QWidget#%1 { background-color: blue; }" ) .arg( objectName() );

there is no MainWindow stylesheet. It should be QMainWindow.

@vicky_mac said in Custom streamer pipeline in QML:

module org.freedesktop.gstreamer.GLVideoItem

if vaapi is used in the pipeline on linux, install libva-dev

Latest version of the driver ?
Did you test using the nouveau driver ?

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.

@vicky_mac you should show the code you are using to manage your pipeline.

Update - After a very long day, turns out that opencv lib was linked to gstreamer0.10, qt to 1.0. This did not work well obviously.
When compiling opencv with linking to gstreamer1.0, works ok.

Did you download Qt's sources ?

@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 :-)

@LuJoRi hello!
I'm very sorry for the so late reply, but I just had some urgent problems, and I had to leave this forum and work with another things.
I see that you shared your advice and sample for this issue as you promised.
So I want to thank you for this!
Unfortunately, I had to do other things, but I think that you helped other users (including chaudhry) to solve this not simple task! :)
Sorry and thank you one more time!

@RockAndCode said in Video plays fine on the linux device using gst-launch, but fails to play with a Qt application?:

Is there certain eglfs settings that needs to be set when running the Qt based apps on the device?

Can you tell me how and which eglfs settings need to be changed?
I am using nVidia TX1 board.