HTML5 “proprietary” audio and video includes all media types that are patented, such as MP4 (H.264/AAC). Under Linux, Vivaldi requires a suitable, third-party support file to play these.
To test video support, load this page. The first video makes use of proprietary audio and video. If it does not play, a suitable, third-party support file has not been installed.
Installing proprietary media support
To correct this situation, start Vivaldi from a “Terminal” using the command vivaldi. The output printed on the terminal will include steps on how to install a support file.
The output provided will be tailored to the version of Vivaldi you run, and take into account your distribution and architecture.
If no installation steps are displayed (when running Vivaldi 2.2+) and the H.264/MP4 video from the test page will not play, issue the following to create a log file that will help us determine what went wrong:
bash -x /opt/vivaldi/vivaldi 2>&1 | sed '/^+ exec -a/q' > /tmp/vivaldi-startup.log
Next, log a bug report stating that you run Linux and cannot play proprietary media and we will send you an email. You can reply to this email with “vivaldi-startup.log” attached.