Hey there, thanks for your work. You are right about them looking slightly better sped up, even though that messes with the audio and the scene length a bit. That's because they're very low FPS so to speak, they indeed look choppy.
I remembered that there are some version at 60FPS on rule34 and thankfully I found something to do the magic for the rest of them. I used Flowframes (it's free and open source so it seemed like a good choice, I'm open to other suggestions) to bring the videos in this archive you posted up to 120FPS (the size difference from 60 was marginal, couple MBs at most, so I thought I'd go for it even if it's barely noticeable lol).
Do note I excluded the videos of the static images since an image looks the same at 1 FPS and at 120 FPS. Those aren't in the following archive at all:
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Looking in the game and on rule34 I do notice some animations that are not in here though, so let's put a pin in it for now and consider it a WIP. If we manage to get a complete set I'm more than open to batch run them overnight once more so we can perhaps make a community made gallery: 60/120 FPS, all anims, jpg-s of the static scenes, split in folders or at least named by the monster they portray, the good stuff. If I find some extra time maybe I'll try to hunt down the missing anims myself, but no promises
Thanks again for your work, you made this possible!
P.S: I've looked into the frames of the videos themselves and while the original videos where 30 FPS the animation itself is only at 7.5-ish FPS, the same frame is 4 times in a row. As such the videos I posted, which are at 120 FPS, only show the animation at 30 FPS because I used a 4x factor. It's still a lot better but this explains the choppiness even further. Not sure what can be done to achieve actual 60 FPS animations, a 240 FPS video seems unreasonable atm, though worth investigating, perhaps there's a way to get the original ones at 7.5 FPS so that Flowframes works with that as a baseline. Idk, worth looking into.