HTML5 Proprietary Media on Linux
HTML5 “proprietary” audio and video includes all media types that are patented, such H.264 (video) and AAC (audio).
To test proprietary media support, try and play the following test video.
Installing proprietary media support
If the test video didn’t play, restart Vivaldi once. This will cause a reinstall of the appropriate support files, in cases where they did not get installed alongside Vivaldi with the initial install or upgrade .
Most audio/video streaming services also require Encrypted Media Extensions to function. If you are able to play the test video above but continue to have issues with streaming services, you should also check out our guide to Widevine CDM (for EME/DRM support).