I think the big difference is a lack of a buffer.
Most video streams (Netflix, Twitch, etc.) actually display a second or so after the data is received. This allows your internet connection to have lots of hiccups (as long as they’re smaller than that second or so) and you’ll never notice. The buffer smooths out the video delivery.
When you’re on a live video chat, you can’t have this buffer, because if you added a 1 second delay onto both sides of the conversation, it would be very difficult to have a conversation. So instead we deal without the buffer (or if there is a buffer, it’s much smaller).
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