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You are extremely lucky if you get a contemporary online livestream under 10 seconds, this includes AFAIK all of YouTube, and the vast majority of HLS-based streams - which are often 30 seconds latency or worse.

Getting buffers down to 500ms is already pretty insane assuming reliability doesn't suffer. 250ms is well within the envelope of a single drop on a 3G network killing playback

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There are plenty of twitch streams that have latency under 2 seconds in low latency mode. You have to watch the source stream and the streamer can't use larger buffers, but it has already been done for well over a year or more. If a streamer has the chat window on screen you can type something in and see it on stream in two seconds. I have seen private mixer streams have 2 second latency also.

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