If you are spending millions on ads, you can pay a couple of guys to watch TV and take notes.
It was not easy for your local triple A baseball game being streamed to 500 viewers. This approach scales down.
Not to mention human accuracy will likely be way, way worse, no human being will maintain their attention counting ads at five second intervals for even ten minutes, almost two hours is unthinkable.
Eventually, people buying ad time on TV stations could request an air check and receive a VHS tape showing a bit of the programming before/after the ad pod your ad ran. Particularly useful when buying ad time on local stations out of the market where you lived.
Not an expert on this but I don't think same kind of manual effort is required anymore.
Technology is funny, I remember when an intern project detected cats in Youtube videos and it was front page news (round here, at least).
Now it's just boring technology.
This goes along well with another saying I have.
"You will never prove machines are intelligent, you will only prove humans are not"
> The analysis counted advertising built into the match footage (e.g. on the hoardings), rather than commercials shown during advertising breaks