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Perhaps you could simply use a self-hosted PeerTube instance (separated from the Fediverse if you wish): https://en.wikipedia.org/wiki/PeerTube.

Not self-hosting, but mux.com provides scalable infrastructure for video delivery. Gets extremely expensive though if you're talking about frequent livestreaming to a sizeable audience.

https://github.com/awesome-selfhosted/awesome-selfhosted#vid... may be helpful.

Really expensive rates

The critical thing Youtube provides is discoverability. Hosting videos can be done on your hard disk. Served from AWS.

Youtube makes it easier for people to care about a person's created content. It solves a social graph problem.

Good luck.

Vimeo?

Ask HN: Static Video Hosting?