this post was submitted on 07 Jul 2023
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I'm not sure what you mean. Do you have a source for more complete explanation?
H.261 is way older than Doom and already uses motion compensation and inter-picture prediction.
The aformentioned demos work by recording all input control states for every tic and then replaying them later in-engine. But I don't think that parallels video encoding.
I am probably misremembering details, as this was something we learned about in my algorithms class in college about a decade ago. I'll see if I can dig up more details after work today.