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

The video is sped up by an *imperceptible* amount, or slowed down to get the opposite. The fractional frame rate is an artifact from analogue television, where the numbers were chosen to reduce interference between the color and sound subcarriers.

Now we are stuck with rates such as 30000/1001 and 24000/1001 for TV and film respectively.