What is the best image-to-image frame interpolation/latent/sparse/schedule/travel/whatever?

[Vektor369]

Hi. I'm trying to generate relatively photoreal animation where I can provide two keyframes maybe a couple/few seconds apart, and generate the 'in-between' frames. I've been around and around the internet, YouTube, etc, but it seems like it's all old and/or unsupported stuff. (And by 'old', I mean six months ago. lol) And, of course, the larger the frames, and the more I can generate at one time, the better. (I already know how to uprez from 512px wide.) Thanks in advance for any suggestions.