Looks like, on Ubuntu 20.04 the fix is as simple as installing the latest version of chromium-codecs-ffmpeg-extra from http://security.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/ for Chromium your Opera version is based on. I just installed chromium-codecs-ffmpeg-extra_97.0.4692.71-0ubuntu0.18.04.1_amd64.deb and video playback in Opera 83 works again. No need to symlink libraries.
Best posts made by niepiekm
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RE: The Videos Don't Play TopicOpera for Linux
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RE: Page crashed after last update to Version:82.0.4227.33Opera for Linux
I observe the same problem on mega.nz on 82.0.4227.23 and 82.0.4227.33. Website loads, shows up for a second and crash information occurs. Opera 81.0.4196.60 was fine.