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I actually meant the whole processing chain for digital, encoding etc.
But it's actually much simpler, there is no live TV broadcast anymore:Why is live TV on a delay?
Today, many live broadcasts on TV aren't truly live. Instead, broadcasters will transmit the feed with a delay of a few seconds. It's a simple procedure that gives them leeway in case something unrehearsed happens that can't be shown on screens.
There's always a delay though - not counting bleep delays and such, electricity takes time to travel as does the signal so I don't think arguing about streaming not being immediate works.