It's a codec issue with Vivaldi and mp4 files.
https://forum.vivaldi.net/topic/63234/mp4-no-sound/1
Try a different version.
Freaking awesome. I've been looking for info all over before asking and you grabbed right away. Thank you, mate :)
Cheers!
Don't forget to post a feedback for which version solved your issue.
Simple fix. Just had to do updates on the apk for mobile, and jumped back to an older version of Ubuntu for laptop. Thanks for pointing me in the right direction. Cheers :)
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