I have found the solution myself.
Apparently, If you install Windows 10 Pro N, media playback isn't supported.
You need this extra feature from Windows 10.
Thanks for the support!
@matir143 said in Vivaldi cannot play some videos on Windows:
Chrome, there everything works.
I have Windows 10 N version that comes with no media support.
So Chrome has inbuilt set of (full) media support!?
Obviously we will have to remember that when trouble-shooting/comparing browsers!!
Nun, ich hab nun des Rätsels Lösung. Auf meinem Rechner ist die Enterprise N Version von Windows 10 drauf. Wenn man das dazu passende Windows Media Pack installiert (command line --> winver eingeben) dann gehts plötzlich auch mit vivaldi.
@xyzzy said in Vivaldi won't reproduce some YouTube videos:
I'm always on the latest snapshot, and I can play the videos on the site. What doesn't work for me is Twitter and (I just discovered this) Gamespot. Youtube, Vimeo and the likes are fine.
Gwen-Dragon's advice worked for me! I went to the first github link (above), copied the latest-proprietary-media.sh script to a local directory and executed it from my account (not root) with no problems. After re-starting Vivaldi and checking the link where the test videos live (you get a reminder with the link when the script completes) the sites that had not worked for me before do now.
Of course, I still hate auto-start videos... 😉