Not selfhosted - tried a lots of solutions there but each of them fell sort at one point. But I’m paying for Readwise Reader for a while and it’s the swiss knife for anything you listed up there. Plus, you can enable (optional) AI summaries, including for videos.

I never had time or patience for video essays that can give once sentence idea in a minimum 8 minute video (minimum for monetization), so I just throw them at Reader, have them summarized and I’m off to go in 30 seconds.