@leocg said in Opera cannot play videos- almost Any videos!:

@jaanis Well, you posted in a topic in Opera for Windows forum. There's a topic regarding it in Opera for Linux forum, with (possible) solutions for that issue.

OK, thanks, I'll search for that one then. I just found this thread by Google.

For Linux:

• https://forums.opera.com/topic/42185/the-videos-don-t-play-topic
• https://forums.opera.com/topic/37539/solving-the-problem-of-the-opera-browser-with-video-playback-in-ubuntu-and-similar-distributions-linux-mint-kde-neon

@leocg said in Opera cannot play videos- almost Any videos!:

@jaanis Maybe you have a N version of Windows?

No, it's Linux Mint 20.1. (I remembered that I need to add this after posting, but I couldn't edit while the post was waiting for approval.)

I cannot play most of the videos on Opera as well, too. (Youtube is working though.) For example, I tried videos on Twitter and bbc.com.

I can watch the videos on Firefox, Chrome, Vivaldi all right.

At https://html5test.com I can see that the difference between Opera and other browsers is the "No" for H.264 support and AAC support. (There is "No" for H.265 support and MPEG-4 ASP support as well, but none of my browsers have that anyway, so that's probably not the problem.)

I have disabled "Use hardware acceleration when available" and enabled "Override software rendering list", and I cannot find the flag "disable-accelerated-video-decode".