qmlglsink fails with EGL_BAD_CONTEXT or fails to retrieve wrapped context on creation on Jetson Tx1

closx

@Bodo I guess something is wrong with your opengl - qt communication for your board. Try this commands on your Jetson,

sudo apt-get build-dep qt5-default
sudo apt-get install build-essential libx11-xcb-dev libglu1-mesa-dev

after that, try to compile your application again. If you have a native qmake, you can try to compile your application in a native way too. For example, you can run these commands on Jetson to native compile.

closx@closx-pc:~$ find / -name qmake
/opt/Qt5.12.3/Docs/Qt-5.12.3/qmake
/opt/Qt5.12.3/Tools/QtCreator/share/qtcreator/templates/wizards/projects/qmake
/opt/Qt5.12.3/5.12.3/android_x86/bin/qmake
/opt/Qt5.12.3/5.12.3/gcc_64/bin/qmake  //This is
//the qmake i will use. Since I am using GCC x64 on my host system.
//for you it can be something like /usr/lib/something/qt5/bin/qmake
/opt/Qt5.12.3/5.12.3/android_armv7/bin/qmake
...

closx@closx-pc:~$ /opt/Qt5.12.3/5.12.3/gcc_64/bin/qmake /path/to/my/project/someproject.pro

Bodo

@closx

I installed the mentioned package (most ot them already were installed) and recompiled via the cross chain with the same result.

Tried a build on the Jetson:

sudo find / -name qmake
/usr/bin/qmake
/usr/share/qt4/bin/qmake
/usr/lib/aarch64-linux-gnu/qt5/bin/qmake
/usr/lib/aarch64-linux-gnu/qt4/bin/qmake

Here I tried the 3rd qmake, but it Exits with:

Project ERROR: Unknown module(s) in QT: qml quick

So I think I'll have to install missing packages here.

closx

@Bodo A-HA! This is why I hate cross-compiling. It skips some packages I dunno why.
Or is it possible you have just built qtbase, not all qt?
Well, I can offer you to remove your currently-built qt builds, maybe restore your Jetson image, install dependencies again, and native-build whole qt. By this way, you can try if can Jetson run your application. Then you can cross-compile and stuff later if you want.

wget "http://download.qt-project.org/official_releases/qt/5.12/5.12.3/single/qt-everywhere-src-5.12.3.tar.xz"

//or choose the version you want from http://download.qt-project.org/official_releases/qt/

tar -xf qt-everywhere-src-5.12.3.tar.xz
mkdir qtconf
cd qtconf

sudo apt-get build-dep qt5-default
sudo apt-get install build-essential libx11-xcb-dev libglu1-mesa-dev

../qt-everywhere-src-5.12.3/configure -release -opensource -confirm-license -opengl es2 -nomake examples -nomake tests -skip qtwebengine -prefix /opt/Qt5.12.3

//I have skipt the module "qtwebengine" cuz it can be a lil-bit tricky some times.
//Be sure that OpenGL ES 2.x .is detected after configuration.

make -j4

//I remember as Jetson has Quad ARM Processor so you can run 4 threads with -j4 option.
//If you dont wanna risk it, just use -j2. And it WILL take a while. Would leave it overnight.

make install

//qmake should be at.. /opt/Qt5.12.3/bin/qmake ..or so similar too that. You can run,

/opt/Qt5.12.3/bin/qmake /path/to/project/someproject.pro

UPDATE: I have checked your guide again, it only compiles qtbase as I said. But you need other modules too. You can use what I wrote up here, or use the same guide with another git sources you can find from here to install qml and quick. But there is TOOOO MANY SOURCES to build qml.

Bodo

@closx
Thanks, will have to read through all this.

Basically I started off with qtbase and added up qtdeclarative and other packages later on (cross compile + sync back to target). This worked fine so far.

I did a compilation on the target platform and it generated a binary now.
But when I run it, I get this:

QQmlApplicationEngine failed to load component
qrc:/main.qml:6 module "QtGraphicalEffects" version 1.12 is not installed

Now I tried:

apt-file search 'qml/QtGraphicalEffects/qmldir'
qml-module-qtgraphicaleffects: /usr/lib/aarch64-linux-gnu/qt5/qml/QtGraphicalEffects/qmldir

and added an Import path in my .pro file:

QML_IMPORT_PATH += /usr/lib/aarch64-linux-gnu/qt5/qml/QtGraphicalEffects

But still get the same result :/

closx

The module "QtGraphicalEffects" is from the QML package. So, you have qml installed your system, at least theoretically, right?

@Bodo said in qmlglsink fails with EGL_BAD_CONTEXT or fails to retrieve wrapped context on creation on Jetson Tx1:

QML_IMPORT_PATH += /usr/lib/aarch64-linux-gnu/qt5/qml/QtGraphicalEffects

Which .pro file you insert this line? Your application's one?

Bodo

@closx
Yes, I inserted this into the project's .pro File.
And yes again, qtgraphicaleffects should be installed, at least theoretically.

Bodo

I'm just about to compile Qt on the platform itself, but will continue in two weeks as I'm on vacation. Just as a notice. Thanks so far for the feedback.

Bodo

@closx :
Back on the problem..

We setup a fresh system and compiled Qt.

When running our testapp, it told me that module 'qmlglsink' is missing.

So I cloned the gst-plugins-bad branch 1.8.3 from the gstreamer repos and configure / maked it.
After some minor adjustments (proper PKG_CONFIG_PATH to /opt/Qt5.12.3/lib/pkgconfig and added c++11 standard to the make it build the plugins).

Then I set the GST_PLUGIN_PATH to /usr/local/lib/gstreamer-1.0/ and gst-inspect now properly found the new qmlglsink module.

Now when running the test project I get this problem:

WARN glcontext gstglcontext.c:495:gst_gl_context_get_current_gl_context: Could not retrieve current context
ERROR qtglutility gstqtglutility.cc:158:gst_qt_get_gl_wrapcontext: cannot wrap qt OpenGL context (NULL)

So obviously I do not get a proper context and have to investigate whats different to the x86 configuration.
Seems as some gst_element_factory_make is failing or something...

Bodo

Add:

This is happening while loading the qml file with the VideoItem:

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

Maybe the window isn't setup properly at this moment and the OpenGL Context does not exist yet?

I'll start a thread on this in the gstreamer devel mailing list too.

adrianf0

@Bodo Have you resolved this issue of wrapped context retrieve failure?

Talkless

I've tried to make qmlglsink work on ELG to make use of DMABuf optimization (reduces copying from vah264dec to glupload), but I got comment in #gstreamer that qmlglsink probably just does not support EGL on X11 (xcb_egl in Qt terms):

[10:42] <ystreet00> Talkless: I don't believe that qmlglsink currently support x11-egl