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I do remember someone mentioning at some point that most video codecs were never intended for realtime streaming. That was in a blurb for a new video codec intended for streaming though, iirc in the context of video conferencing. Might be related, I'm not sure.

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It's not related. Companies like Youtube and Google don't do real-time encoding of their video streams, they encode "offline" (= prior) and stream the already-encoded video many times. So real-time'ness of video codecs is not relevant to this topic.

In that context it was because most video algorithms are designed to chunk, which reduces bandwidth at the cost of increasing latency. That's a good trade off for Youtube, but not as good in a real time scenario like video conferencing.

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