Bug 464219

I have been trying to use Kdenlive in Linux Garuda Dragonized, Installed all versions, currently running Flatpak. I can start the app w/o issues. However, when I try to import a file into the project tray, (regardless of video or image), the program feezes. Actually it seems to be still running but stuck in some process. The thumbnail is not ceated and the program seems to wait for that. A small window appears in the middle of the screen, but only the title bar is created, it says; Warning Kdenlive. Closing the window is impossible, you get the message that the program is not responding, but closing does not work, except via systemmonitor - kill process.
I have started in console. This is the output:
profilePath from appDir/../share: "/app/share/mlt-7/profiles"
meltPath from KdenliveSetting::rendererPath: "/app/bin/melt"
Empty metadata for "avcolour_space"
Empty metadata for "avcolor_space"
Empty metadata for "avdeinterlace"
Empty metadata for "swscale"
Empty metadata for "swresample"
Empty metadata for "audiochannels"
Empty metadata for "audioconvert"
Empty metadata for "imageconvert"
Empty metadata for "glsl.manager"
Empty metadata for "movit.convert"
Empty metadata for "movit.crop"
Empty metadata for "movit.resample"
Empty metadata for "movit.resize"
Empty metadata for "telecide"
Empty metadata for "deinterlace"
plugin not available: "avfilter.acompressor"
plugin not available: "avfilter.aecho"
plugin not available: "avfilter.agate"
plugin not available: "avfilter.atadenoise"
plugin not available: "avfilter.bs2b"
plugin not available: "avfilter.bwdif"
plugin not available: "avfilter.deblock"
plugin not available: "avfilter.dedot"
plugin not available: "avfilter.deflate"
plugin not available: "avfilter.derain"
plugin not available: "avfilter.doubleweave"
plugin not available: "avfilter.field"
plugin not available: "avfilter.framestep"
plugin not available: "avfilter.fspp"
plugin not available: "avfilter.graphmonitor"
plugin not available: "avfilter.hqdn3d"
plugin not available: "avfilter.inflate"
plugin not available: "avfilter.lagfun"
plugin not available: "avfilter.loudnorm"
plugin not available: "avfilter.random"
plugin not available: "avfilter.removegrain"
plugin not available: "avfilter.separatefields"
plugin not available: "avfilter.shuffleplanes"
plugin not available: "avfilter.sofalizer"
plugin not available: "avfilter.sr"
plugin not available: "avfilter.tmix"
plugin not available: "avfilter.w3fdif"
plugin not available: "avfilter.weave"
plugin not available: "avfilter.yadif"
plugin not available: "frei0r.baltan"
plugin not available: "frei0r.bgsubtract0r"
plugin not available: "frei0r.bigsh0t_eq_to_stereo"
plugin not available: "frei0r.delay0r"
plugin not available: "frei0r.delaygrab"
plugin not available: "frei0r.facebl0r"
plugin not available: "frei0r.facedetect"
plugin not available: "frei0r.lightgraffiti"
plugin not available: "frei0r.lightgraffiti"
plugin not available: "frei0r.tehRoxx0r"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "ladspa"
plugin not available: "movit.unsharp_mask"
plugin not available: "timewarp"
plugin not available: "region"
=== /// CANNOT ACCESS SPEECH DICTIONARIES FOLDER
QQmlEngine::setContextForObject(): Object already has a QQmlContext
QQmlEngine::setContextForObject(): Object already has a QQmlContext
QQmlEngine::setContextForObject(): Object already has a QQmlContext
QQmlEngine::setContextForObject(): Object already has a QQmlContext
QGradient::setColorAt: Color position must be specified in the range 0 to 1
QGradient::setColorAt: Color position must be specified in the range 0 to 1
QGradient::setColorAt: Color position must be specified in the range 0 to 1
:::: USING TRACK COMPOSITING: "frei0r.cairoblend"
QQmlEngine::setContextForObject(): Object already has a QQmlContext
:::: USING TRACK COMPOSITING: "frei0r.cairoblend"
:::: USING TRACK COMPOSITING: "frei0r.cairoblend"
:::: USING TRACK COMPOSITING: "frei0r.cairoblend"
/////////// starting to add bin clips
kf.kio.widgets.kdirmodel: No node found for item that was just removed: QUrl("file:///home/johann/Videos/desktop.ini")
kf.kio.widgets: Cannot read information about filesystem under path "/home/johann/.var/app/org.kde.kdenlive/cache/thumbnails/"
/////////// found list (QUrl("file:///home/johann/Videos/Bildschirmaufnahme 2022-12-27 20:40:17.mp4"))
/////////// creatclipsfromlist (QUrl("file:///home/johann/Videos/Bildschirmaufnahme 2022-12-27 20:40:17.mp4")) true "-1"
virtual QStringList Solid::Backends::UPower::UPowerManager::allDevices() error: "org.freedesktop.DBus.Error.ServiceUnknown"
virtual QStringList Solid::Backends::UPower::UPowerManager::allDevices() error: "org.freedesktop.DBus.Error.ServiceUnknown"
/////////// createClipFromFile "/home/johann/Videos/Bildschirmaufnahme 2022-12-27 20:40:17.mp4" "-1"
=== GOT DROPPED MIME: "video/mp4"
/////////// final xml "\n <property name="resource">/home/johann/Videos/Bildschirmaufnahme 2022-12-27 20:40:17.mp4\n\n"
============STARTING LOAD TASK FOR: "/home/johann/Videos/Bildschirmaufnahme 2022-12-27 20:40:17.mp4"

:::::::::::::::::::
/////////// creatclipsfromlist return false
################### ProjectClip::setproducer #################
################### ClipController::updateProducer
################### ClipController::addmasterproducer
READY FOR THUMB ClipType::Video

=========
SEEKING THUMB PROD

=========
SETTING AUDIO DATA IN MON
=== GOT THUMB FOR: -1 x -1