So Twitch has a new “low latency” mode. Except by low latency they mean 2-3 seconds, whereas before it was more like 10 seconds. And for some reason they’re still using HLS. Meanwhile, Mixer has been sub-second for a long time… which is still an order of magnitude over ideal.
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that gets you around it in theory, but it's not ubiquitous in browsers yet (especially mobile), doesn't work on all networks, and adds a large amount of server-side complexity
WebRTC works in practice, but is very heavy server-side. We use it for audio (<70ms latency end to end) but it's a lost cause for video with our infra.
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Why is it heavy? Is it an issue with the server software or something more fundamental?
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It's basically mandatory DTLS, which requires negotiating a 1:1 stream with each client, so multicast doesn't work. The server-side software stacks are a lot less mature than the HTTP ecosystem. It's possible but not nice.
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