And I'm not asking about just speed change, but something in the lines of SVP (Smooth Video Project). For those who doesn't know, it's a filter to interpolate frames from a video below 60fps to said framerate in real time, "smoothing" them. It's not always perfect, but the final result is pretty good at least.

In my case, it's taking things like post #604551 and transcoding to this keeping similar size but with a fluid animation, without any apparent artifacts (or too much of them).

nonono2 said:
And I'm not asking about just speed change, but something in the lines of SVP (Smooth Video Project). For those who doesn't know, it's a filter to interpolate frames from a video below 60fps to said framerate in real time, "smoothing" them. It's not always perfect, but the final result is pretty good at least.

In my case, it's taking things like post #604551 and transcoding to this keeping similar size but with a fluid animation, without any apparent artifacts (or too much of them).

Personal feeling? No. It's adding stuff that wasn't there in the original, and it's just a bit of software attempting to smooth everything together. And if it is realtime as you state, then anybody that wants it would be able to do it to their own copy.
As the tech progresses, the older stuff will look worse, and we don't want a dozen different uploads of the same video, just ran through a different program.
Also as a personal aside: all of those "smart interpolators" (ESPECIALLY the ones that run in realtime, usually on like high refresh-rate TVs) make me feel ill. Due to the errors that they create in the motion, it doesn't look realistic, and it'd just be better left as the source footage. Our brain is PRETTY good at filling in the gaps when we need to.

The post you cited is already just a photowarp, which is frankly as high-framerate as the author cared to export (Likely trying to keep the flash runing smoothly), and honestly I couldn't see much of a difference between your version and the post besides being fuzzier (which may be dropbox serving a low res version) and with a little bit of warping where 2 layers at different depths/speeds/directions meet (most obvious is the left side of the table on her thigh.

I just personally don't feel it's adding anything to the quality of the site's database. Now, a hand-made framerate increase for very low FPS animations (I'd say sub 30 at the high end, but like 5-12FPS animations) would definitely be welcome, imho. It takes a lot of work, and the end result looks much better. But once an animation is at 30FPS? It doesn't matter much.
Also some people don't like high framerate animations. I recall post #472434 having a little debate in the comments about if it's "too smooth", and the creator of the animation actually posting a 24FPS version for people who didn't like the high-framerate one.