I try that before installing opera-stable and opera-stable-libffmpeg from russian-fedora repos, and that don't work for me.
But now, all work fine with packages opera-stable and opera-stable-libffmpeg.
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I have same issue with fedora, and solve problem with the fedora-russian repo : see this thread : https://forums.opera.com/topic/20914/opera-45-don-t-show-daylimotion-video/5
I don't know if it's possible, but if you download the source package and rebuild for your distro, may-be that work...
I solve this issue by installing opera-stable-45.0.2552.812-1.fc25.R.x86_64.rpm for Fedora 25 ( https://fedora.pkgs.org/25/russian-fedora-nonfree-updates-x86_64/opera-stable-45.0.2552.812-1.fc25.R.x86_64.rpm.html ) and opera-stable-libffmpeg-58.0.3029.81-1.fc25.R.x86_64.rpm for Fedora 25 ( https://fedora.pkgs.org/25/russian-fedora-nonfree-updates-x86_64/opera-stable-libffmpeg-58.0.3029.81-1.fc25.R.x86_64.rpm.html ) from russian-fedora repo.
All video work fine.
I test opera and when I want see a video on dailymotion I have black screen with this warning (sorry I am french):
Merci de mettre à jour votre navigateur ou d'en essayé un autre.
Video on youtube work well.