Been using it for a month with my pebble time. No health features yet but everything else more or less works. The underlying library that actually handles the comms with the pebble is open source so it's easy to add new features and fix bugs yourself.
Usually football trasmissions have identifiable elements in the screen, such as the score, the match title, etc... and those are fixed elements that do not appear in ads. For example: https://i.imgur.com/blebca8.png
Or the title bar below. You could do some basic OCR on a Pi, when the team names are readable, keep the volume up, when they are not, disable it.
The SRT logs from DJI are a god send. I wrote some software that helps me deal with importing videos and photos from multiple action cameras and drones, and it uses DJI's SRT files to sort out the location of a video. https://github.com/KonradIT/mmt