Because you would then assume that higher fps = slowmotion / slower image
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You record the film at 1000 FPS but replay it at, say, 24 FPS. That makes it slow motion. In games you have to calculate motions and animation delays based on the target FPS. You usually do that calculation in each iteration of the game loop. Otherwise varying FPS would indeed result in varying motion and animation speed.
You are confusing recording speed and playback speed.
Normally, you want the recording speed and playback speed to be the same. If you record a video at 30 FPS, then you also want to play it at 30 FPS. This is what happens when you play a videogame – if the videogame is at 60 FPS, then the images are created at 60 FPS and played at 60 FPS.
If you playback at a slower framerate than the recorded frame rate, then the video is shown in slow motion. For example if I record a video at 60 FPS and they play it back at 30 FPS, then it would take two seconds to play each second of the original video.
When you see a “1000 FPS” video, it means that the video was *shot* at 1000 FPS, but is now played back at 30 or 60 FPS, resulting in slow motion.
Slow-motion videos are recorded at 1000 fps and then played back at 24, 30, or 60 fps. As a result, the video looks like slow. The difference in recording and play-back is what makes it slow-motion. In case of video games, there is no “recording”, so it will only look like slow motion when the game wants to show you slow motion.
Not sure but every movement is being adapted to the frame rate and therefore gives you a smoother experience.
The progress of a movement from image to image is smaller at higher frame rates yet it takes place in the same amount of time.
And in slow motion the higher frame rate is replayed in real-time with a standard Fram rate and therefore it seems to be slower.
If this makes any sense to you
If a video is recorded at 1000 fps, and you play it back at 1000 fps, it won’t be slow-motion.
However, that’s not what happens. The point of recording at such high framerates is that you can then play it back at something like 60 fps, and see a smooth video in which time progresses much more slowly than in reality. For instance, if you played it back at 50 fps, then one second in real recorded time would be stretched over 20 seconds of playback time. This is how you get the slow-motion effect: things that took 1 second in real life now take 20 seconds.
You need the high recording frame rates for the video to look smooth when its played back slowly. For instance, say you recorded at 60 fps and then played the video back at 3 fps. Again, this would mean that 1 second of recorded time would be stretched over 20 seconds of playback time. Only now, every second you play back only contains 3 frames, so it won’t look smooth at all. Instead, it will look like a fast slide show. And you don’t really get the benefit of slow-motion allowing you to see fast movements slowed down, because anything that happened in between those 3 frames is either not captured or smeared out as motion blur in each frame.
When you play a game, the fps is simply how many frames are drawn every second. At 30 fps, the game world is rendered 30 times per second. At 200 fps, the game world is rendered 200 per second. But the rate at which time progresses in the game world isn’t changed. It’s just a matter of how many “glimpses” you get of the game world in each second. There’s no recording and playback. Or, if you prefer, you can think of it as recording the game world and playing it back at the exact same time, with the same frame rates for recording and playback.
The slow motion effect comes from recording things in a different fps rate than you play it back.
If you record a video at 60fps and play it back at 30fps without leaving any frames out, it runs at half the speed. Everything will appear to move half as fast as it really did. a minute long video will take two minutes to play that way.
If you record a video at 60fps and play it back at one tenth of the original speed you end up only displaying 6 frames per second.
To the human eye that no longer looks like a smooth motion but just as a series of still images.
if you play a 60fps video at one sixtieth of the original speed you only have a single frame every second left. It looks ugly, like on of those ancient security cameras that only takes a single picture each second.
To be able to play a video back in really slow motion and still have it look good, you need to record it with enough fps that you can slow it down and still have enough fps left to see a good quality video.
You can play back a 1000 fps video at 1/20th of the original speed and still have a comfortable 50 fps video.
This is why cameras designed for slow motion video capture record at extreme fps rates that wouldn’t really be of any use if played back at normal speeds.
In a game the frames aren’t spaced the same time apart like in video.They are rendered in real time. In fact most of the rendered pixels with high frame rates just gets tossed aside and never displayed. Mostly the benefits have to do with having kindof a buffer so that when a more complex scene shows up and your framerate dips it doesn’t cause noticable jumps in the display.
It also helps because since the frame rendering happens out of sync with the display refresh rate there is some jitter between what time in an animation a frame was renders st and what time it should actually be shown. Having more frames to pick from means that the max jitter is reduced and can potentially result in a smoother animation.
Also some minor benefits with reduced input lag.
Check out this video from the slomo guys. This video was recorded at 90,000 fps and the video was 1 second long. But if you play it back those 90,000 frames at 25 fps then the video is an hour long. 1 second of time stretched to an hour.
Films that are *filmed* in 1000 fps for the purpose of slow motion, are played back at the standard 24 fps. Video games with higher number of fps, are played at that higher number, not slowed down to a lower fps.
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