It exists: https://github.com/mediacms-io/mediacms

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Also, I am building one. Demo available at https://subatic.com

I developed a pipeline to create slow/fast gif, seeking thumbnail and transcode to various resolutions.

Also I sorted out u/NikStalwart concern using cloudflare R2.

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Math below.

It costs $0.36 to serve a million files, regardless of size.

An average of 3 sec hls segment, so I can serve 3 million seconds (833.33 hours) for 0.36$.

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1$ = ~ 2316 hours.

Average video is 10 minutes give or take.

So, 14,000 streams of a a video for 1$ or 72$ for a million streams.

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and the pricing can be reduced by increasing hls segment post first minute of video since initial buffering needs to be quick. I have done the math for that as well, it all comes down to ~10$ for a million views.