Ask HN: Open-source content library for an alt. to streaming subscriptions?

I grow tired of 4+ subscriptions running concurrently and I am considering moving back to purchasing original content and (re)building my content library.

Is there an open source content library management system that I can run on a SmartTV or RaspberryPi?

It’s important to me that my kids have the ability to safely find content that my wife and I find suitable for the children, and that is growing harder to do with modern subscription services.

It would be ideal if I can index my own DVD rips and VHS->MP4 files, and store this all locally for personal use.

Any help is appreciated!