Unofficial (non deb/rpm) packages
If you use a Linux distribution that is not rpm or deb based and the above did not work, please contact the Vivaldi package maintainer for your distribution, to get assistance in cases where proprietary media is not working after installation. If they are unsure how to best resolve these issues, you may also want to suggest that they refer to this guide on how to configure proprietary media in non-official Vivaldi Linux packages.