Will this work with flatpak package?

[butter-fly04]

I'm using Opera's flatpack package form flathub on Fedora.

[Ld-Hagen]

No. It works with native version only

[burnout426]

Try putting libffmpeg.so in "/var/lib/flatpak/app/com.opera.Opera/x86_64/stable/xxx.../files/opera/lib_extra/". It worked for me the last time I tested.