Atract Mode Demo Loops

[Kernel_Panic]

Hi,
Sorry if this has been asked and answered before!
When I used to play DOOM and DOOM II back in the '90s, the games would play prerecorded video loops of gameplay.
Fast forward 25 years, and I've been playing the games on GZDoom for a while now, and it kind of bothers me that these loops are missing.
Is there a way to enable them?

Thank you in advance for all your help!

[Graf Zahl]

GZDoom does not care about keeping demos compatible between versions, which would require re-recording them each time, and that's not worth the effort.

[JPL]

If you'd like to see the demos that come with the original IWADs, check out a source port with demo compatibility like Crispy Doom: https://github.com/fabiangreffrath/crispy-doom/releases

[okbuddy]

Is there any easy way for non-programmer types to re-record the vanilla demos? I ask because I am both insane and bored enough to do so for each new release as I also greatly miss watching those demos. Using another source port is out of the question. I tried recording new demos that were my own playthroughs that attempted to mimic the vanilla ones but it just wasn't the same. Thanks in advance either way.

[Caligari87]

Not really? Demos only consist of player input, and GZDoom changes enough of the underlying simulation that the player's input in the vanilla demos will quickly no longer reflect what happens in the game world (desync, basically). The only solution is what you tried, re-recording the demos "as close as possible" in the updated simulation. Unfortunately, this will always only be a temporary fix as your new imitation demo will no longer be compatible next time GZDoom makes a change to the underlying simulation code.

[okbuddy]

Understood. I suspected it was so but thought I would ask. Thanks for the info.