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YouTube has found a new way to load ads | AdGuard Blog
(adguard.com)
This is a most excellent place for technology news and articles.
They're not referring to the YouTube ads, but the "let's take a minute to talk about today's sponsor nordvpn that I used on my trip to Antarctica." This is a part of the video file itself, and it starts and ends at the same time for all users.
Nope, it’s analyzing the sound to guess where the intro starts and ends. Turns out this is pretty simple to implement, but quite reliable. Source: worked for Plex
This is about intro detection in TV shows, not ad blocking. I’m not proposing this as a good way to block ads, just noting that this feature in Plex doesn’t use a database.