@lavanyadeepak-0
I ran into the same issue, so I reported it as a bug to opera and got this automated bug fix response, they must get it a lot. I haven't tried it yet but I thought that I would post in in here as another fix method:
Automation for Jira commented:
It looks like your report is connected with media issues on Linux OS.
Unfortunately, Opera .deb and .rpm versions don't support the H.264/MP4 codec natively. We recommend using snap to avoid problems with codecs.
If you want to fix it manually, please try the following steps:
You should have Chromium installed on your system.
Download Chromium.
Run the following command in Linux Shell:
sudo ln -s /usr/lib/chromium-browser/libs/libffmpeg.so /usr/lib/x86_64-linux-gnu/opera/lib_extra/libffmpeg.so.32
(This command links the Chromium libffmpeg.so file to Opera.)
Now restart Opera and visit this site to check if HTML5 playback works correctly.
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Thank you for helping improve Opera!
Best wishes, the Opera Desktop Team