Opera updated and video playback got bad again so I installed :
chromium-codecs-ffmpeg-extra_99.0.4844.84-0ubuntu0.18.04.1_amd64
But no luck 
My Opera Version : 86.0.4363.23
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@myswtest I am now using Opera developer version because regular Opera is unusable
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newly released opera version :111.0.5168.25
solved my problem.