Vivaldi Blog:
The following improvements were made since the eighth 8.1 minor update:
- [Linux][Media] H.264/AAC fails in Ubuntu 22.04, Mint 21.3, Slackware 15.0 and other older distros (VB-129888)
Source:
Minor update (9) for Vivaldi Linux Desktop Browser 8.1
This update includes a fix for proprietary media (H.264/AAC) for users of older LTS Linux distributions. Linux Snap packages, along with Windows and macOS were not affected and have not been updated.
vivaldi.com
