This is not over-fitting, a fully overfit model is one that would only detect positives on the 5 or so frames that it was trained on, but this is clearly genera

This is not over-fitting, a fully overfit model is one that would only detect positives on the 5 or so frames that it was trained on, but this is clearly generalising well to unseen frames - many unseen frames - so yeah, like you say, it’s not overfit.