Welcome to the forums, thanks for starting a new topic and enjoy Vivaldi Browser. type vivaldi://version on the Address Bar to get the full path of the Profile folder HTML5 is present on your machine, YT requires it access to content protected by DRM - in https://demo.castlabs.com there is a video that includes subtitles HBO, Netflix have a look at this article available on Vivaldi Browser Help (hit F1 to access). @ruario (our Linux Wizard) is the author of many of those shell scripts.

Thank you very much! That did it. So, I guess that the problem was that my solution worked, until the Chromium version was changed, and everything blew up. Do you know if I will have to keep updating the extra ffmpeg? It is OK to do it every now and then, but it would be nicer if the rpm came already fully packaged.

@Gwen-Dragon I have filed a bug report and included all info I could think of. Thanks for your help.