Could not find the Qt platform plugin "eglfs" in ""

SGaist

Then the version of Qt you have currently installed on your target does not provide that plugin.

Did you deploy the one you use for cross-compiling your application ?

kutluyigitturk

I do not have qt installed on the Orange Pi that I intend to run.

I think our main goal is to transfer executable files of qt projects to Orange Pi and connect remotely via ssh and run projects on Orange Pi.

SGaist

How did you install Qt on the OrangePi ?

kutluyigitturk

@SGaist I did not install Qt on the Orange Pi. I installed it on my host computer.

SGaist

That path /usr/local/qt5opi/ suggests a non standard installation. Hence it would be good to know how it was installed.

In any case, you have a cross-compiled Qt version on your host, correct ? If so, you should deploy it on your device so your application can use it.

kutluyigitturk

@SGaist
What am I supposed to understand from this deployment process? How can I do the deploy process? By the way, I leave the youtube link I took as an example here, this is how I installed it.

https://youtu.be/TmtN3Rmx9Rk

If you watch the video, you will understand how I installed it. I'm a bit of a novice in these matters and solving this problem will add a lot to me.

SGaist

Do you want to run your application on EGLFS or X11 like the video shows how to do ?

kutluyigitturk

@SGaist It makes no difference to me, I don't know the difference between the two? Is there a performance difference between the two?

SGaist

The first one uses the hardware directly and does not provide windowing capabilities the other uses the Xorg server. Like most desktop installation (unless they run in Wayland).

kutluyigitturk

@SGaist The Project I've created aims to command GPIO pins. Which do you think would be better for me to do?

JKSH

@kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

The Project I've created aims to command GPIO pins. Which do you think would be better for me to do?

Does your project need a GUI?

Since you are driving GPIO pins and you are running the application via SSH, that suggests to me that you don't need either EGLFS or X11. If that's the case, make your project a Console application instead of a GUI application -- then you won't need any of these GUI plugins.

(see https://doc.qt.io/qtcreator/creator-project-creating.html and select "Qt Console Application" when you create a project)

However, to make it a Console application, you must remove all GUI-related code (including Qt Quick) from your project.

kutluyigitturk

@JKSH I aim to control the GPIO pins with the help of an interface. So "Qt Console Application" doesn't really solve my problem.

I attach the video link I was inspired by,
https://youtu.be/lh8lqtgzqYA

JKSH

@kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

I attach the video link I was inspired by,
https://youtu.be/lh8lqtgzqYA

Raspberry Pi is not Orange Pi.

Your Orange Pi has Qt installed in /usr/local/qt5opi/. How did it get there? Did you install it, or does it come with the Orange Pi?

If it comes with the Orange Pi, I suggest you ask the producers of Orange Pi for instructions on how to use their software distribution.

Alternatively, try to force it to use the xcb plugin instead of the eglfs plugin and see what happens. From SSH, call ./OrangeDemlQml -platform xcb

kutluyigitturk

@JKSH I am creating the folder named /qt5opi in the /usr/local directory. I create with this command, sudo mkdir /usr/local/qt5opi . You can see the same process when you open the 14th minute of the video.

When I execute this command ./OrangeDemoQml -platform xcb I get a very similar error.

./OrangeDemoQml -platform xcb is the error I get when I execute this command:

qt.qpa.xcb: could not connect to display 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl, xcb.

Aborted

Errors I get after running export QT_DEBUG_PLUGINS=1

QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5opi/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archreq": 0,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqminimal.so"
Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqoffscreen.so"
Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqvnc.so"
Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archreq": 0,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqwebgl.so"
Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqwebgl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqxcb.so"
Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/opi/platforms" ...
loaded library "/usr/local/qt5opi/plugins/platforms/libqxcb.so"
qt.qpa.xcb: could not connect to display 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl, xcb.

Aborted

JKSH

@kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

You can see the same process when you open the 14th minute of the video.

? The video is less than 6 minutes long.

I am creating the folder named /qt5opi in the /usr/local directory. I create with this command, sudo mkdir /usr/local/qt5opi

OK, where do the .so files (like libQt5Core.so) come from?

When I execute this command ./OrangeDemoQml -platform xcb I get a very similar error.

The root cause is very different.

The "eglfs" plugin failed to load because the plugin does not exist.
The "xcb" plugin failed because your X Server could not connect to your display: "qt.qpa.xcb: could not connect to display "

Do you have a display attached to your device? Have you logged into the display with the same Pi account that you used with SSH?

kutluyigitturk

@JKSH Sorry, here is the video I was talking about. https://youtu.be/TmtN3Rmx9Rk

I don't know where it came from, I think you can understand it if you examine the youtube link I gave above.
I'm very new to this stuff, please excuse my ignorance.

Yes, Orange Pi is connected to a monitor via HDMI cable. Should I try unplugging the HDMI cable?

kutluyigitturk

@JKSH I want to talk about something else. This is the command I ran while configuring it:

../qt-everywhere-src-5.15.2/configure -opengl es2 -device linux-rasp-pi2-g++ -device-option CROSS_COMPILE=/opt/qt5opi/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- -sysroot /opt/qt5opi/sysroot -prefix /usr/local/qt5opi -opensource -confirm-license -skip qtscript -skip qtwayland -skip qtdatavis3d -nomake examples -make libs -pkg-config -no-use-gold-linker -v

You may ask why you are configuring Raspberry Pi2 while processing for Orange Pi One V1.1. Because there is no installation configuration for Orange Pi. I am attaching an image below and this image shows us on which devices we can use it. I chose the Raspberry Pi2 because it is closest to the Orange Pi in terms of processor architecture.

Adsız.png

After running the configuration file, I would like to share the configuration summary with you.

Configure summary:

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: devices/linux-rasp-pi2-g++ (arm, CPU features: neon)
Target compiler: gcc 7.5.0
Configuration: cross_compile compile_examples enable_new_dtags largefile neon precompile_header shared rpath release c++11 c++14 c++1z concurrent dbus reduce_exports stl
Build options:
  Mode ................................... release
  Optimize release build for size ........ no
  Building shared libraries .............. yes
  Using C standard ....................... C11
  Using C++ standard ..................... C++1z
  Using ccache ........................... no
  Using gold linker ...................... no
  Using new DTAGS ........................ yes
  Using precompiled headers .............. yes
  Using LTCG ............................. no
  Target compiler supports:
    NEON ................................. yes
  Build parts ............................ libs
Qt modules and options:
  Qt Concurrent .......................... yes
  Qt D-Bus ............................... yes
  Qt D-Bus directly linked to libdbus .... yes
  Qt Gui ................................. yes
  Qt Network ............................. yes
  Qt Sql ................................. yes
  Qt Testlib ............................. yes
  Qt Widgets ............................. yes
  Qt Xml ................................. yes
Support enabled for:
  Using pkg-config ....................... yes
  udev ................................... yes
  Using system zlib ...................... yes
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ yes
  GLib ................................... yes
  iconv .................................. no
  ICU .................................... yes
  Tracing backend ........................ <none>
  Logging backends:
    journald ............................. no
    syslog ............................... no
    slog2 ................................ no
  Using system PCRE2 ..................... yes
Qt Network:
  getifaddrs() ........................... yes
  IPv6 ifname ............................ yes
  libproxy ............................... no
  Linux AF_NETLINK ....................... yes
  OpenSSL ................................ yes
    Qt directly linked to OpenSSL ........ no
  OpenSSL 1.1 ............................ yes
  DTLS ................................... yes
  SCTP ................................... no
  Use system proxies ..................... yes
Qt Gui:
  Accessibility .......................... yes
  FreeType ............................... yes
    Using system FreeType ................ yes
  HarfBuzz ............................... yes
    Using system HarfBuzz ................ yes
  Fontconfig ............................. yes
  Image formats:
    GIF .................................. yes
    ICO .................................. yes
    JPEG ................................. yes
      Using system libjpeg ............... yes
    PNG .................................. yes
      Using system libpng ................ yes
  EGL .................................... no
  OpenVG ................................. no
  OpenGL:
    Desktop OpenGL ....................... no
    OpenGL ES 2.0 ........................ yes
    OpenGL ES 3.0 ........................ yes
    OpenGL ES 3.1 ........................ yes
    OpenGL ES 3.2 ........................ yes
  Vulkan ................................. yes
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... yes
  INTEGRITY HID .......................... no
  mtdev .................................. yes
  tslib .................................. yes
  xkbcommon .............................. yes
  X11 specific:
    XLib ................................. yes
    XCB Xlib ............................. yes
    EGL on X11 ........................... no
QPA backends:
  DirectFB ............................... no
  EGLFS .................................. no
  LinuxFB ................................ yes
  VNC .................................... yes
  Mir client ............................. no
  XCB:
    Using system-provided XCB libraries .. yes
    XCB XKB .............................. yes
    XCB XInput ........................... yes
    Native painting (experimental) ....... yes
    GL integrations:
      GLX Plugin ......................... no
      EGL-X11 Plugin ..................... no
Qt Sql:
  SQL item models ........................ yes
Qt Widgets:
  GTK+ ................................... no
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... yes
Qt Sql Drivers:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... no
  PostgreSQL ............................. yes
  SQLite2 ................................ yes
  SQLite ................................. yes
    Using system provided SQLite ......... no
  TDS (Sybase) ........................... yes
Qt Testlib:
  Tester for item models ................. yes
Qt SerialBus:
  Socket CAN ............................. yes
  Socket CAN FD .......................... yes
Further Image Formats:
  JasPer ................................. no
  MNG .................................... no
  TIFF ................................... yes
    Using system libtiff ................. yes
  WEBP ................................... yes
    Using system libwebp ................. yes
Qt QML:
  QML network support .................... yes
  QML debugging and profiling support .... yes
  QML sequence object .................... yes
  QML list model ......................... yes
  QML XML http request ................... yes
  QML Locale ............................. yes
  QML delegate model ..................... yes
Qt Quick:
  Direct3D 12 ............................ no
  AnimatedImage item ..................... yes
  Canvas item ............................ yes
  Support for Qt Quick Designer .......... yes
  Flipable item .......................... yes
  GridView item .......................... yes
  ListView item .......................... yes
  TableView item ......................... yes
  Path support ........................... yes
  PathView item .......................... yes
  Positioner items ....................... yes
  Repeater item .......................... yes
  ShaderEffect item ...................... yes
  Sprite item ............................ yes
Qt Scxml:
  ECMAScript data model for QtScxml ...... yes
Qt Gamepad:
  SDL2 ................................... no
Qt 3D:
  Assimp ................................. yes
  System Assimp .......................... no
  Output Qt3D Job traces ................. no
  Output Qt3D GL traces .................. no
  Use SSE2 instructions .................. no
  Use AVX2 instructions .................. no
  Aspects:
    Render aspect ........................ yes
    Input aspect ......................... yes
    Logic aspect ......................... yes
    Animation aspect ..................... yes
    Extras aspect ........................ yes
Qt 3D Renderers:
  OpenGL Renderer ........................ yes
Qt 3D GeometryLoaders:
  Autodesk FBX ........................... no
Qt Bluetooth:
  BlueZ .................................. no
  BlueZ Low Energy ....................... no
  Linux Crypto API ....................... no
  WinRT Bluetooth API (desktop & UWP) .... no
Qt Sensors:
  sensorfw ............................... no
Qt Quick Controls 2:
  Styles ................................. Default Fusion Imagine Material Universal
Qt Quick Templates 2:
  Hover support .......................... yes
  Multi-touch support .................... yes
Qt Positioning:
  Gypsy GPS Daemon ....................... no
  WinRT Geolocation API .................. no
Qt Location:
  Qt.labs.location experimental QML plugin . yes
  Geoservice plugins:
    OpenStreetMap ........................ yes
    HERE ................................. yes
    Esri ................................. yes
    Mapbox ............................... yes
    MapboxGL ............................. yes
    Itemsoverlay ......................... yes
QtXmlPatterns:
  XML schema support ..................... yes
Qt Multimedia:
  ALSA ................................... yes
  GStreamer 1.0 .......................... yes
  GStreamer 0.10 ......................... no
  Video for Linux ........................ yes
  OpenAL ................................. no
  PulseAudio ............................. yes
  Resource Policy (libresourceqt5) ....... no
  Windows Audio Services ................. no
  DirectShow ............................. no
  Windows Media Foundation ............... no
Qt Tools:
  QDoc ................................... no
Qt WebEngine:
  Embedded build ......................... yes
  Full debug information ................. no
  Pepper Plugins ......................... no
  Printing and PDF ....................... no
  Proprietary Codecs ..................... no
  Spellchecker ........................... yes
  Native Spellchecker .................... no
  WebRTC ................................. no
  Use System Ninja ....................... no
  Geolocation ............................ yes
  WebChannel support ..................... yes
  Use v8 snapshot ........................ yes
  Kerberos Authentication ................ no
  Support qpa-xcb ........................ no
  Building v8 snapshot supported ......... no
  Use ALSA ............................... yes
  Use PulseAudio ......................... yes
  Optional system libraries used:
    re2 .................................. yes
    icu .................................. no
    libwebp, libwebpmux and libwebpdemux . yes
    opus ................................. yes
    ffmpeg ............................... no
    libvpx ............................... no
    snappy ............................... yes
    glib ................................. yes
    zlib ................................. yes
    minizip .............................. yes
    libevent ............................. yes
    jsoncpp .............................. yes
    protobuf ............................. no
    libxml2 and libxslt .................. yes
    lcms2 ................................ no
    png .................................. yes
    JPEG ................................. yes
    harfbuzz ............................. yes
    freetype ............................. yes
  Required system libraries:
    fontconfig ........................... yes
    dbus ................................. yes
    nss .................................. yes
    khr .................................. yes
    glibc ................................ yes
  Required system libraries for qpa-xcb:
    x11 .................................. no
    libdrm ............................... yes
    xcomposite ........................... no
    xcursor .............................. no
    xi ................................... no
    xtst ................................. no

Note: Also available for Linux: linux-clang linux-icc

Note: PKG_CONFIG_LIBDIR automatically set to /opt/qt5opi/sysroot/usr/lib/pkgconfig:/opt/qt5opi/sysroot/usr/share/pkgconfig:/opt/qt5opi/sysroot/usr/lib/arm-linux-gnueabihf/pkgconfig

Note: PKG_CONFIG_SYSROOT_DIR automatically set to /opt/qt5opi/sysroot

WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.

Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation.
On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution.
On macOS, you can use Homebrew's llvm package.
On Windows, you must set LLVM_INSTALL_DIR to the installation path.

WARNING: flex is required to build QtWebEngine.

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/opt/qt5opi/sysroot/usr/local/qt5opi'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

Here is the part that caught my attention.

 Required system libraries for qpa-xcb:
    x11 .................................. no
    libdrm ............................... yes
    xcomposite ........................... no
    xcursor .............................. no
    xi ................................... no
    xtst ................................. no

Could my problem be caused by these?

SGaist

Did you install the related development libraries on your target device before synchronizing the root filesystem ?

kutluyigitturk

@SGaist Yes, I did.

SGaist

Then you should check the test logs to see exactly what failed with them.