You could look at LBRY (https://lbry.tech https://lbry.com https://beta.lbry.tv).

LBRY is similar to PeerTube in open and decentralization, but all content metadata is written to a blockchain, which means everyone/anyone can access the index. This blockchain can then be searched (https://github.com/lbryio/lighthouse) or extracted to SQL (https://github.com/lbryio/chainquery).