How can I change the animation fps when I already have finished making an animation? I already did an animation and I don't want spend some time recalculating the time by hand, is there a easy way to change the frame rate without making the animation speed up or slow down?
You can change the timing of an animated scene without changing the frame rate. In the rendering settings Dimensions there is a time remapping section:
It works like this:
The values are in frames
If you want the whole animation to run twice as fast you set the old to 100 and new to 50.
Animated values that took 100 frames now will happen in 50
To make the animation last twice as long (slower) map old to 100 and new to 200.