Issue to build release with GStreamer GLVideoItem

mipr

Hello,

I am working on an application for Windows which displays a video stream thanks to GStreamer and it uses the GStreamer QML item GLVideoItem, however it doesn't work in release mode.

To import GLVideoItem I need to clone the GStreamer branch (gst-plugins-good), to build it in release and to copy/paste gstqmlgl.dll, gstqmlgl.lib and gstqmlgl.pdb into my GStreamer installation folder.
After, I add this QML item inside my QML file :

...
import org.freedesktop.gstreamer.GLVideoItem 1.0

Item  {
    GstGLVideoItem {
        anchors.fill: parent
        objectName: "gstVideoDisplay"
    }
}

I have an issue with the import : QML module not found (org.freedesktop.gstreamer.GLVideoItem). but I can build and launch the application without issue in build mode and the video stream is displayed.

When I try to build in release mode I have no issue, but when I launch the app I have the following issue : module "org.freedesktop.gstreamer.GLVideoItem" is not installed and the app is stuck with a white screen.

I have the feeling that gstqmlgl files are not linked to the executable file during the compilation and doesn't create dll files for gstqmlgl. I don't understand why it works in debug and not in release. Do you have some ideas or did you come across this problem ?
Thanks in advance !

SGaist

Hi and welcome to devnet,

Maybe a silly question but did you build everything both for debug and release ?

mipr

Hi @SGaist, thanks for your answer !

There is no silly question, what do you mean by "build everything both for debug and release"? Did I build my project in debug, tried it and did the same in release? If it was the question then yes. And the error only occurs in release when I launch the app, not during the build.
If I comment the GstGLVideoItem and the importation of GLVideoItem, I can build and launch the app in release (this confirms the displayed error).

I have found a similar question but I don't understand the solution, it's too vague so I have contacted the author but I have no answer for now.
I don't know if it is necessary to modify GstGLVideoItem element to use it, it seems strange to me to have created a "generic" component that we must modify to implement it.

Pablo J. Rogina

@mipr said in Issue to build release with GStreamer GLVideoItem:

And the error only occurs in release when I launch the app, not during the build.

Could you explain this better please?
When you say "when I launch the app.." does it mean when you run the application standalone? Not launching it from Qt Creator?

mipr

Hi @Pablo-J-Rogina,

Yes sorry. It occurs when I run the application from Qt Creator in release, I also tried to run the app standalone but as I suspected, it doesn't work too.

Edit: I've found that the GstGLVideoItem object is created when the gstreamer pipeline make qmlglsink : gst_element_factory_make ("qmlglsink", NULL) because in my gstreamer logs I see the pipeline steps initiating successfully but just after, I have the previous error.

SGaist

I meant the build of the dependencies.

mipr

@SGaist I don't think so, I begin with Qt and I have trouble understanding how to manage dependencies and how to build them. I saw "Specifying Dependencies" in documentation but I don't know if it is relevant to my problem (I tried to build with the qtplugin of gstreamer in dependency but it doesn't solve my issue).

SGaist

I meant the GStreamer plugin package.

ShahShaj

This post is deleted!

cscat

@mipr hi，by the way, how to compile gstqmlgl.dll, gstqmlgl.lib in windows, use MSVC?

JoeCFD

@SGaist leave a solution here. Just in case.
on Linux
sudo apt-get install gstreamer1.0-qt5

FlyingBoar

@cscat it seems to be the eternal question. Did you succeed?.. I can do builds both via Meson and Qt Creator. As topic starter said, release build does not work.

FlyingBoar

@mipr did you find solution? Release build does not work, development is OK.