I haven't resumed work on this project, but I found 2 other related projects which try to lower the volume when ads are playing :

• https://matthewfelgate.wordpress.com/2022/12/14/turn-the-radio-volume-down-for-adverts-and-djs-talking/

This one requires an expensive Sonos speaker system and seems to rely on meta data to detect ads.

• https://lifehacker.com/automatically-lower-the-volume-during-loud-commercials-5984091

This one is much more DIY and relies on the  ads being louder than the TV show you're watching. Not sure how reliable this is or if it is still working as the project is 10 years old!

Video ad blocking may become a topic a gain as Netflix seems to offer a plan with ads : https://help.netflix.com/en/node/126831

Not sure if it reached Europe yet.