Extract video information from single video html source code

[plokiaze]

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I was wondering how can I extract video information, from a python script, of a single youtube video page, if I already have the html source code of the page?
In other world, I would like to request a page by myself, and use youtube-dl to extract information from the html I got, without having it doing a request.

Thanks.

[yan12125]

Duplicate of #10511. See discussions there for why it's not feasible.