As for exporting Koikatsu animations, have you tried exporting them to webm for Renpy? I found that so far VP8 encoded webm animations work well for Renpy, especially for looping animations. VP9 right now needs to be fixed for Ren'py which would likely be for the next update 8.1
Usually selecting the option for length by animation instead of by seconds works well for Koikatsu animation exporting.
I'd probably would be better off making a short tutorial video on it and putting it on LBRY/Odyssey instead of YouTube.
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I do export them to webm but in VP9 because of the smaller file size. I've tried to use the animation length option but it can't be selected for some reason so I've been using seconds option, that's way in some animations Momo's tail looks a little bit weird.
I think it'd be great if you make a tutorial about it since I still have a lot to learn :)
I've been making images and content with a resolution of 2560 x 1440. Even webm animations with both VP9 and VP8. I've noticed that with Renpy, that webm animations encoded with vp9 have a slight lag. But that's getting fixed in the next Renpy update.
There is an option to only record only the animation frames, it's works pretty good for looping animations, so that they loop cleaner. I've tried the seconds before but they loop a bit funny if you don't get the animation timing down.
I might just make a short and simple PDF document on the matter. There's a Koikatsu discord server that's pretty helpful, but plenty of them hate on those using Renpy + Koikatsu.
I might put the tutorial of it on a Itchio page, as a sort of learning asset. There's also these free and open-sourced projects you can learn from.