-Which model Mac?
-Which version of macOS - Big Sur I assume?
-Do you have any ad blocking or other Safari Extensions?
-Can you give a couple of links that have the videos?
-Have you cleared Safari History recently?
It's a last year's 13" Macbook Pro, OS 10.15.7, Catalina. I do use an ad blocker but the embedded video malfunction occurs on blocked and unblocked sites, eg the Guardian.co.uk. I haven't cleared Safari History.
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