The human eye can "see" hundreds of frames per second, and those videos are much more fluid in their first part than in the second. This debate makes me remember one day at the university, when our teacher of signal proccesing tried to explain the Nyquist rate and the Shannon theorem. ¿Can you feel the difference between 8000 Hz (POTS) vs 16000 Hz (VOIP) sound? ¿And between 22050 Hz and 44100 Hz sound? Super audio CD uses 2822400 Hz, so someone thinks there is a market for those higher than what most people think its neccesary frecuencies.
In videogames something similar happens, some people believe 30 fps are more than needed, but it deppends on the variability of the image. If you have much information, when the scene changes fast, you need more frames to have a fluid sensation, if you have less movement, you need less frames. Try to play a strategy game at 15 fps, some games are playable. Try the same with a shooter or a driving game, you need much more frames to make it playable.
