How the BBC and ITV are fixing delays on World Cup live streams

Re:How the BBC and ITV are fixing delays on World Cup live s... by convivialdingo on Friday July 13, 2018 @05:13PM (#17526740)

AT&T did this for Uverse - it’s unicast for 5 seconds then it switches over to multicast. I assume there’s some key frames and h26x codec configuration that’s necessary.

Unfortunately multicast doesn’t work across the internet. It’s typically filtered or ignored I think.

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Re:How the BBC and ITV are fixing delays on World Cup live s... by sofaofthedamned on Friday July 13, 2018 @05:33PM (#17526903)

That's correct. The unicast is there to catch up to the next multicast key frame and reduces the channel hop lag.

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Re:How the BBC and ITV are fixing delays on World Cup live s... by tinus_hn on Saturday July 14, 2018 @04:28AM (#17529399)

Multicast works great across the internet but it fails because everyone uses NAT in their home.

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Re:How the BBC and ITV are fixing delays on World Cup live s... by isostatic on Sunday July 15, 2018 @05:58AM (#17534565)

There's issues with wifi from memory.

Not sure why multicast wouldn't work from behind nat, assuming the router supported it.

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