https://www.youtube.com/watch?v=Hav_fLecDMI
Is this frame interpolation or native 60fps? Your post and video description don't make it clear.

This is not framerate interpolation, it is running at 60 fps.


Nope, clearly not with my current of knowledge (or lack of) on this.

The timer is simply one of the values to change - in Shenmue I, it's as simple as adding 1/8 second to the in-game clock every frame instead of 1/4 second (note, I don't actually know the units used in the engine, but it's this kind of substitution).

https://www.youtube.com/watch?v=Hav_fLecDMI

That's nice, but did you ever figure out fixing NPCs etc.? It might help to use the PAL version and see what changes between 50Hz and 60Hz modes.

Yes, NPC's animations can be slowed down or speed up, same for cutscenes animations and camera movement during cutscenes, it is a collosal task though, I am sure that what I am tweaking are return values instead of the main instruction, anyway I've patched it in to Shenmue I iso though.

The same can be done with Shenmue II

https://www.youtube.com/watch?v=NlraMumrc5U