I was using only Opera after formating my PC. Everything was perfect until I've found this bug several times:

In Youtube some videos can't be played but other videos was normal. The propaganda before them is still playable.
Otherwise, any livestream cant be played by Opera. Youtube or Twitch. None .
This problem remains in another sites/players, not only youtube/google based. Whatsapp video cant be played too.

In other browsers (Edge chromium) the same videos was playable, so there's a Opera problem.

I've found similar bug several times in this forum, but only in Linux, But i tryed put a new codec (win x64) and didnt works. I've uninstalled Opera and i'm trying use again, but the problem remains.

Can someone help me? (and others who can have the same problem)

and Please Forgive my bad english.