# eli5 : Is 1000 fps is always slow motion?

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Can you play a video in 1000fps at normal speed?
Or play a game at normal speed with this fps?

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1000fps refers to how many frames were captured in a second. It’s then played at a typical fps that we can actually watch and understand.

How fast we can display fps is limited by our hardware. How fast can the monitor show a new frame? How fast can these images be processed?

Typically if you’re recording that fast, it’s so you can watch something slowed down.

The human brain/eye only processes about 16fps (but because we aren’t perfectly synced with whatever video we’re watching, we can tell the difference). 120fps is about the max of what our brains need for it to be seamless without it becoming superfluous.

So yes, currently high speed cameras are used for slow motion because anything beyond 120fps is excessive for the average person.

Slow-motion (or fast-forward) happens if you display the video at a different frame rate than it was shot at.

If you shoot at 24fps and show the video at 24fps, you’re getting a normal video. If you instead slow down the playback to show the video at 1fps, it takes 24 seconds to show a clip that took one second to record, resulting in an extremely choppy slide show.

If you pump up those numbers and shoot at 240fps but show the result at 24fps, you get a comparatively smooth video that still stretches one second of footage into 24 seconds of view time which lets you see details you’d otherwise miss.

Technically speaking there’s nothing stopping you from shooting and displaying video at 1000fps, but it’s pretty tough to find a monitor that can show images that fast, especially when at some point you stop seeing the difference.

A video is slowed down by replaying it at a lower FPS. If you could display 1000fps then it would be normal speed.

60 fps would be slow motion if you played it back at 1 fps, but then it’d be a slideshow. 1000 fps would be used so you could replay it at a lower fps but still see motion because it’s still a reasonable viewing fps.

Edited for clarity, hopefully.

At the moment, yes. But that’s only because we can’t play anything back at 1000fps. (As far as I know)

Slow motion is quite simply when you record something at a higher rate than you play it back. So if you record it at 1000fps and pay it back at 500fps, then it will appear to be slow motion.

It would be a massive waste of time and money to play a 1000fps video at normal speed. It costs a lot of money to generate a video with that many frames per second. When you playback that video on a normal TV or monitor that only displays 60fps, 940 of those frames are wasted each second.