When the kids were just babies, the missus and I would often turn the volume down on the television to almost off, and enable captioning. - So we could hear them if they were crying, and to try to keep them sleeping. We also used captioning as a reading aid for the kids, squeezing at least a little bit of education into a kids program that wasn't designed with learning in mind.
It dove me batty. It was almost never accurate, and we gave up on it.