I installed Okular 1.10 via snap and, unlike the previous versions, it can't play videos embedded into pdfs due to the backend problem:
WARNING: bool Phonon::FactoryPrivate::createBackend() phonon backend plugin could not be loaded
WARNING: Phonon::createPath: Cannot connect Phonon::MediaObject ( no objectName ) to Phonon::AudioOutput ( no
objectName ).
No matter how hard I try to export QT_PLUGIN_PATH with all the libs installed by
sudo apt install phonon4qt5 phonon4qt5-backend-gstreamer phonon4qt5-backend-vlc
or
sudo apt-get install phonon-backend-vlc
it still yields the same error.
strace doesn't even help to find out where Okular is trying to search the backend for.
Any hints?
I install Okular via snap because the Ubunutu's repository has an old version with a bug which nobody takes care of, namely, crash after quitting presentation mode.
