Qt multimedia warnings Qt 6.6.0

AkshayFP

Just downloaded Qt 6.6.0 on Ubuntu 22.04 and I started getting these errors when running the app:

qt.multimedia.ffmpeg.libsymbolsresolver: Couldn't load OpenSsl library
qt.multimedia.ffmpeg.libsymbolsresolver: Couldn't load VAAPI library

I have OpenSSL - openssl and libssl-dev. Not sure what VAAPI.

Any idea what else I would need?

JoeCFD

@AkshayFP can you check if you have libva? if not, simply install it. both gstreamer and FFmpeg need it.
https://github.com/intel/libva

respect88

@JoeCFD I have the same issue with Ubuntu 22.04 and Qt for Python 6.5.3. Installing the libva-dev Ubuntu package solved the VAAPI dependency error. But I still have the OpenSSL library error. I have OpenSSL version 3.0.2 installed on my machine.

AkshayFP

@JoeCFD libva error seems to be fixed. But I am still getting OpenSsl warning

SGaist

@AkshayFP you can use something like strace to check which version of OpenSSL is getting loaded.

respect88

@SGaist Strace shows Qt looking for openssl 1.1 and Ubuntu 22.04 upgraded to using OpenSSL 3.

I installed openssl 1.1 using these instructions and the OpenSSL error is resolved.
https://stackoverflow.com/questions/72133316/libssl-so-1-1-cannot-open-shared-object-file-no-such-file-or-directory

But the webcam is still not working, no error is outputted. It is a blank white screen. The webcam works in other linux programs.

import sys, os
from PySide6.QtWidgets import QApplication
from PySide6.QtQuick import QQuickView

if __name__ == "__main__":

    # os.environ["QT_DEBUG_PLUGINS"] = "1"

    app = QApplication(sys.argv)

    view = QQuickView()
    view.setSource("main.qml")
    view.show()

    sys.exit(app.exec())

main.qml

import QtMultimedia
import QtQuick
import QtQuick.Controls

ApplicationWindow {
    visible: true
    width: 640
    height: 480

    CaptureSession {
        camera: Camera { id: camera }
        videoOutput: videoOutput
    }

    VideoOutput {
        id: videoOutput
        anchors.fill: parent
    }

}

Here is the result of running QT_DEBUG_PLUGINS=1

qt.core.plugin.factoryloader: checking directory path "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms" ...
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqxcb.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archlevel": 1,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqwayland-generic.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqwayland-generic.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland"
        ]
    },
    "archlevel": 1,
    "className": "QWaylandIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqwayland-egl.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqwayland-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-egl"
        ]
    },
    "archlevel": 1,
    "className": "QWaylandEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland-egl")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqvnc.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archlevel": 1,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vnc")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqvkkhrdisplay.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqvkkhrdisplay.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vkkhrdisplay"
        ]
    },
    "archlevel": 1,
    "className": "QVkKhrDisplayIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vkkhrdisplay")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqoffscreen.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archlevel": 1,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqminimalegl.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "archlevel": 1,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimalegl")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqminimal.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archlevel": 1,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqlinuxfb.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archlevel": 1,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("linuxfb")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqeglfs.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "archlevel": 1,
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("eglfs")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforms" ...
qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforms/libqxcb.so" loaded library
qt.core.plugin.factoryloader: checking directory path "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platformthemes" ...
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platformthemes/libqxdgdesktopportal.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platformthemes/libqxdgdesktopportal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "xdgdesktopportal",
            "flatpak",
            "snap"
        ]
    },
    "archlevel": 1,
    "className": "QXdgDesktopPortalThemePlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xdgdesktopportal", "flatpak", "snap")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platformthemes/libqgtk3.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platformthemes/libqgtk3.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "gtk3"
        ]
    },
    "archlevel": 1,
    "className": "QGtk3ThemePlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gtk3")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/platformthemes" ...
qt.core.plugin.factoryloader: checking directory path "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforminputcontexts" ...
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "qtvirtualkeyboard"
        ]
    },
    "archlevel": 1,
    "className": "QVirtualKeyboardPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("qtvirtualkeyboard")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "ibus"
        ]
    },
    "archlevel": 1,
    "className": "QIbusPlatformInputContextPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("ibus")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "compose",
            "xim"
        ]
    },
    "archlevel": 1,
    "className": "QComposePlatformInputContextPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("compose", "xim")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforminputcontexts" ...
qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so" loaded library
qt.core.plugin.factoryloader: checking directory path "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/styles" ...
qt.core.plugin.factoryloader: checking directory path "/usr/bin/styles" ...
qt.core.plugin.factoryloader: checking directory path "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/xcbglintegrations" ...
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/xcbglintegrations/libqxcb-glx-integration.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/xcbglintegrations/libqxcb-glx-integration.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.Xcb.QXcbGlIntegrationFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xcb_glx"
        ]
    },
    "archlevel": 1,
    "className": "QXcbGlxIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb_glx")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/xcbglintegrations/libqxcb-egl-integration.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/xcbglintegrations/libqxcb-egl-integration.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.Xcb.QXcbGlIntegrationFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xcb_egl"
        ]
    },
    "archlevel": 1,
    "className": "QXcbEglIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb_egl")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/xcbglintegrations" ...
qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/xcbglintegrations/libqxcb-glx-integration.so" loaded library
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtMultimedia/libquickmultimediaplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlEngineExtensionInterface",
    "archlevel": 1,
    "className": "QMultimediaQuickModule",
    "debug": false,
    "uri": [
        "QtMultimedia"
    ],
    "version": 394496
}


qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtMultimedia/libquickmultimediaplugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQml/WorkerScript/libworkerscriptplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlEngineExtensionInterface",
    "archlevel": 1,
    "className": "QtQmlWorkerScriptPlugin",
    "debug": false,
    "uri": [
        "QtQml.WorkerScript"
    ],
    "version": 394496
}


qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQml/WorkerScript/libworkerscriptplugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Controls/libqtquickcontrols2plugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archlevel": 1,
    "className": "QtQuickControls2Plugin",
    "debug": false,
    "uri": [
        "QtQuick.Controls"
    ],
    "version": 394496
}


qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Controls/libqtquickcontrols2plugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Controls/Fusion/libqtquickcontrols2fusionstyleplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archlevel": 1,
    "className": "QtQuickControls2FusionStylePlugin",
    "debug": false,
    "uri": [
        "QtQuick.Controls.Fusion"
    ],
    "version": 394496
}


qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Controls/Fusion/libqtquickcontrols2fusionstyleplugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Controls/Basic/libqtquickcontrols2basicstyleplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archlevel": 1,
    "className": "QtQuickControls2BasicStylePlugin",
    "debug": false,
    "uri": [
        "QtQuick.Controls.Basic"
    ],
    "version": 394496
}


qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Controls/Basic/libqtquickcontrols2basicstyleplugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Templates/libqtquicktemplates2plugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archlevel": 1,
    "className": "QtQuickTemplates2Plugin",
    "debug": false,
    "uri": [
        "QtQuick.Templates"
    ],
    "version": 394496
}


qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Templates/libqtquicktemplates2plugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Window/libquickwindowplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlEngineExtensionInterface",
    "archlevel": 1,
    "className": "QtQuick_WindowPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Window"
    ],
    "version": 394496
}


qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Window/libquickwindowplugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Controls/Fusion/impl/libqtquickcontrols2fusionstyleimplplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlEngineExtensionInterface",
    "archlevel": 1,
    "className": "QtQuickControls2FusionStyleImplPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Controls.Fusion.impl"
    ],
    "version": 394496
}


qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/qml/QtQuick/Controls/Fusion/impl/libqtquickcontrols2fusionstyleimplplugin.so" loaded library
qt.core.plugin.factoryloader: checking directory path "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/multimedia" ...
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/multimedia/libgstreamermediaplugin.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/multimedia/libgstreamermediaplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformMediaPlugin",
    "MetaData": {
        "Keys": [
            "gstreamer"
        ]
    },
    "archlevel": 1,
    "className": "QGstreamerMediaPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gstreamer")
qt.core.plugin.factoryloader: looking at "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/multimedia/libffmpegmediaplugin.so"
qt.core.plugin.loader: Found metadata in lib /usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/multimedia/libffmpegmediaplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformMediaPlugin",
    "MetaData": {
        "Keys": [
            "ffmpeg"
        ]
    },
    "archlevel": 1,
    "className": "QFFmpegMediaPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("ffmpeg")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/multimedia" ...
qt.core.library: "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/multimedia/libffmpegmediaplugin.so" loaded library
qt.core.library: "ssl" loaded library
qt.core.library: "crypto" loaded library
qt.core.library: "va" loaded library
qt.core.library: "va-drm" loaded library
qt.core.library: "va-x11" loaded library
QQuickView does not support using a window as a root item. 

If you wish to create your root window from QML, consider using QQmlApplicationEngine instead. 

failed to stop capture
/home/ubuntu/main.py:15: DeprecationWarning: 'exec_' will be removed in the future. Use 'exec' instead.
  sys.exit(app.exec_())
qt.core.plugin.factoryloader: checking directory path "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/accessiblebridge" ...
qt.core.plugin.factoryloader: checking directory path "/usr/bin/accessiblebridge" ...
qt.core.plugin.factoryloader: checking directory path "/usr/local/lib/python3.10/dist-packages/PySide6/Qt/plugins/accessible" ...
qt.core.plugin.factoryloader: checking directory path "/usr/bin/accessible" ...

JoeCFD

@respect88 also make sure video drivers are installed. Install VLC and see if vlc works correctly.

respect88

@JoeCFD Installing the program 'cheese' in Ubuntu works to display the webcam. I am going to try upgrading to Ubuntu 23 and install this package gstreamer1.0-qt6, which isn't available for Ubuntu 22

JoeCFD

@respect88 I do not think upgrade will help. But it is nice to use Ubuntu 23. Try to find FFmpeg debug tool to check what is wrong. For example, in gstreamer you can set GST_DEBUG env variable to find out gstreamer related errors. FFmpeg must have something similar.
Qt Multimedia is a black box and it is hard to find where the problem is.

While ffmpeg doesn't have a dedicated environment variable like GST_DEBUG in GStreamer, you can achieve a similar debugging effect using the AV_LOG environment variable. ffmpeg uses the libavutil library for logging, and AV_LOG is the environment variable that controls the logging level.
Possible values for AV_LOG include:

quiet: Show no messages.
panic: Only show fatal errors.
fatal: Only show fatal errors and errors.
error: Only show errors.
warning: Show errors and warnings.
info: Show errors, warnings, and informational messages.
verbose: Show all the above, plus more verbose output.
debug: Show all messages, including debugging information.

respect88

@JoeCFD Having trouble finding a ffmpeg tool that can debug my app.

I did create a bug report a few months ago. I feel like this whole switch to ffmpeg is still kinda new and all the issues aren't ironed out.

https://bugreports.qt.io/browse/QTBUG-116470

JoeCFD

@respect88 Not sure how big your multimedia app is. It may not be that hard to code raw FFmpeg pipeline in your qt code. I use gstreamer for streaming in my Qt app.
Any of them will be good. Then, you will have more control over what you want to do.

oniongarlic

@AkshayFP reported this today, https://bugreports.qt.io/browse/QTBUG-110805
Basically the ffmpeg backend is looking for OpenSSL 1.1 libraries.

oniongarlic

Oops, wrong url, I mean this one https://bugreports.qt.io/browse/QTBUG-118178

Trung Ngo

https://bugreports.qt.io/browse/QTBUG-110805
This ticket has resolved in Qt 6.5.5 but I cannot find this version in my Qt installation.
Anyone know how to install this?
PS: I have done with Qt 6.6.1 but I want to do with Qt 6.5.5

jsulm

@Trung-Ngo said in Qt multimedia warnings Qt 6.6.0:

Anyone know how to install this?

How did you install Qt?
If using online installer you can use Qt Maintenance Tool to install another Qt version (you probably will have to enable Archive to install older versions).

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@jsulm I use either a clean installation or Maintenance. All of them do not include Qt 6.5.5
Only Qt 6.5.3 and up to 6.6.0. It does not have Qt 6.5.4 and Qt 6.5.5

jsulm

@Trung-Ngo said in Qt multimedia warnings Qt 6.6.0:

It does not have Qt 6.5.4 and Qt 6.5.5

It could be that these versions are not provided via installer for OSS users (only for commercial users). You would need to build that Qt version from source. But why don't you want to use Qt 6.6.x?