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Hello, thank you very much for quick response :) this is the output: (gnome-mpv:3): Gtk-DEBUG: Connecting to session manager (gnome-mpv:3): Gtk-DEBUG: Failed to get the GNOME session proxy: The name...

I tried to install flatpak-libs, xdg-desktop-portal, xdg-desktop-portal-gtk- xdg-utils, gvfs-fuse, fuse, ostree-fuse, I tried to start gnome-mpv flatpak as sudo but nothing helps, I am still getting the same error :/

I already tried this but it does not work too, even opening file from command line does not work: flatpak run io.github.GnomeMpv '/data/Downloads/Curl Noise Flow.mp4' ** Message: [file] Cannot open...

If other apps work and can open files it cant be bug of flatpak or could it?

Enterprise Linux 7.4 is using flatpak version 0.8.7, could it be possible that opposed to newer versions it does not support some function which GnomeMpv needs for opening files?

Ok new findings... Before I had only installed flatpak and ostree packages when running GnomeMpv I was not able to open video with plus sign icon and "open" (when clicking...

TingPing thank you very much for clarification, I read more about how desktop-portal works and it makes perfect sense. But in my case xdg-desktop-portal-gtk was not installed automatically with flatpak....

On Centos 7.4 but it should be the same.

should I report it on flatpak github or do flatpak developers get notified of this issue when you label it with red flatpak label?

Guys from Luminance HDR team advised me to try some qt5 variables. So after fiddling with some qt environment variables I get these results: QT_AUTO_SCREEN_SCALE_FACTOR=1 ./luminance-hdr  QT_SCREEN_SCALE_FACTORS=2 ./luminance-hdr...