Yes, I know about that one. But that is not what I'm looking for.
What I want to do is exactly what you describe, but perhaps not with eurosport and eurosport 2.
But say a French channel show Champions league in HD, my french is useless. So instead I would like to have sound from an English talking channel. That is the function I'm seeking.
As these wonderful boxes with BH can do PIP and record one channel while showing another I think it should be technically possible. Question is if someone ever made the software for it.