I have same problem.
Only in opera, not other browsers and not desktop video player.
Eg this video: https://img.joemonster.org/upload/szh/2045038d854627aDzieci_sa_slodkie_i_.mp4 plays in my opera like that: https://lkn.pl/operaVideoBug.MOV
Best posts made by gchmiel
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RE: Opera video stutter/lagOpera for Windows