How video editing softwares change the FPS from ~29.87 FPS to 30 FPS. Where do the extra frames come from?

Question

How video editing softwares change the FPS from ~29.87 FPS to 30 FPS. Where do the extra frames come from?

In: 39

Answer 1

There are no extra frames. Imagine a video has 1000 frames. At 10fps, it’d be 100 seconds long; at 30fps it’d be 33.3 seconds long; at 29.87fps it’d be 33.48s long. The difference between 10fps and 30fps is very noticeable, but the 0.18s difference between 29.87 and 30 isn’t noticeable.