I have many problems with video-content, the sound is way to slow (maybe the video too?). I read about to fix it with Useragent-Addon, but this causes problem with video-paysites whi ch don`t like many different useragents in one account.
Why so many browser works fine and Vivaldi has problems? I prefer using Vivvaldi, but this useragent-thingy is a pain...
User agent is just telling the website you are using some other browser, not changing the way the browser actually works. Hence it is really an issue with the website and not with Vivaldi. Ask them why Vivaldi has to pretend to be a different browser for their site to work.
Some video and audio encoding for streamed media is not correct detected in Vivaldi mostly on Windows or Mac. There are some unfixed bugs in Vivaldi, bug fixes are in progress for slow audio or not-playing video.
Thanks alot : )