Pretty sure they just use timestamps from a crowdsourced database, just like sponsorblock.
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
overcast5348@lemmy.world 1 month ago
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.
helenslunch@feddit.nl 1 month ago
Except it doesn’t when an ad is injected in the middle. Then all timestamps after the ad are offset by the length of the ad. That’s not from me, that’s from SponsorBlock themselves in the OP.