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If I click the VLC icon in left panel in Debian 10, not show the application window and if I try play the movie file (.avi) not see the application window. I can run only the terminal in vlc command in Debian 10. If I restart the PC the problem is solved, but only sometimes, not always.
vlc
VLC media player 3.0.8 Vetinari (revision 3.0.8-0-gf350b6b5a7)
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
QObject::~QObject: Timers cannot be stopped from another thread
vlc --version
VLC media player 3.0.8 Vetinari (revision 3.0.8-0-gf350b6b5a7)
VLC 3.0.8 Vetinari (3.0.8-0-gf350b6b5a7) verzió
Forrásból fordította buildd ezen: x86-csail-01.debian.org (Aug 20 2019 18:34:42)
Fordítóprogram: gcc version 8.3.0 (Debian 8.3.0-6)
A programra NINCS GARANCIA, a hatályos jogszabályok által engedélyezett mértékig.
Tovább terjesztheti a GNU General Public License feltételei alapján;
további információ a COPYING fájlban olvasható.
Írta a VideoLAN csapat; lásd az AUTHORS fájlt.
Sounds like a video problem in GNOME. Have you tried starting GNOME in xorg mode, or installing a small, different DE like XFCE alongside GNOME, to see how VLC works there?
You can also try starting vlc with the suggested "QT_QPA_PLATFORM=wayland" to see if that helps. I think that a websearch will show you how to add it to the vlc command, since I don't remember exactly.
I'm sorry, but I had no time try this and I would not like XFCE or other. Not just a problem for me. Please see: forum.videolan.org
Sorry, but no one here gets paid for their time helping others either. It's a shame that you couldn't take literally just a couple minutes to install and try XFCE to narrow it down to a GNOME issue.