That's why you pass it to a big, clever neural network with some reasoning and let it figure it out for you.

Put multiple different sources through multiple different LLMs and take a consensus of them. If there isn't a clear winner, declare it uncertain.

It'd be a bit of a bodge, but it'd work.

If you can get a live feed of the broadcast, you could also try feeding visual information in to be processed by a multimodal LLM.