,How does higher frames per second like 10000 fps mean a super slow motion video??
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Every second of time that passess there are 10000 images taken, nothing you know can move so fast as to make 10000 different motions. so played at normal speed aka like 30fps that 10000fs would take hours to play out. But the playback can be at any speed. So we can actually play those 10000 frames and see what happens in a single second of time.
So a 30fps at super high speed gives super fast video.
Inveverse, is 10000fps at slow speed gives slow video.
10000 fps itself does not make a slow motion video. It becomes slow motion when its played at regular fps – a 6000 fps video played at 6000 fps (not sure there’s a device that can play that fast) would be 1/1 speed, 600 fps would be 1/10 speed, and 60 fps will slow it down to 1/100th speed.
On the other hand, you could record a 60fps video and play it at 1/100th speed, but that will make a 0.6 fps video. A really choppy one and you won’t be seeing things very well. So you need to record it at a really high framerate to be useful.
Think of a single frame being a single picture. Generally, movies are filmed at 24 frames per second. Every second that passes, 24 ‘pictures’ are shown. The timing between each frame is insanely quick. But if you stretch out that timing, turning a 1 second film of 24 frames, and make it last for 24 seconds, you’re spending one full second on each frame. So then it just looks like a quick slide show.
Now when it comes to high speed cameras, the camera records at insanely high frames per second. So you can fit hundreds if not thousands of frames into a single second. Then to see it in slow motion, you simply increase the timing between each frame. Boom. Slow motion.
I’ll go for the ELI5: imagine running through a forest as fast as you can. Are you able to see or count individual leafs lying on the ground? No. This is what 30 fps video is like. You can see tree’s and bushes, but seeing the small stuff becomes hard.
Now imagine how many details you can see when you really take the time. When you stand still or are walking really slowly, you have more time to let your eyes focus and all of the sudden you see small insects, maybe a rabbithole and tons more. You can look at more things per meter you walk.
When you are recording video at 10000 fps and playing it back at a more regular 30fps, you are essentially walking really slow through the forest. For each second passing you take many more photos, thus catching much more file details, just like you have more time to look at little things when walking instead of running.
Take a stack of 100 sheets of paper. These are 100 frames of video.
Move them one at a time to another spot on your desk, as fast as you can, but only ever moving one sheet of paper at a time. This is how fast your video can play on your screen.
A 10,000 FPS camera can create a stack of 10,000 sheets of paper in one second. Now imagine how long it would take for you to move all of those sheets–that’s slo-mo.
It has to do with filming speed versus playback speed.
When you take a normal video you’re usually doing about 30fps. This number isn’t random, it’s about what our brain can process to make a bunch of photos in a row look like smooth video. So 30fps means the camera is taking 30 pictures per second. When you watch that video you then play that back also at 30fps. You’re seeing 30 pictures each second. If you make a 5 second video you take 150 pictures and then play them back all in a row over 5 seconds.
When you do slo mo, you are taking many more pictures in that second but when you play them, you play at the normal speed. To make the math easy, let’s do 3,000fps instead of 10,000. When you take a video at 3,000fps you’re taking that many photos in a second. This means they are happening so much faster and so you can see much smaller changes between each photo. This lets you look at them and see those very tiny differences. Now if you tried to play them back at 3000fps as well, you wouldn’t really notice, they would be showing too fast for your brain to notice. But if you take those 3000 photos and play them back at the 30fps you’re used to, now you can see each frame, and notice all those little changes. But as you can see, it will take you a lot longer to play 3000 frames at only 30 per second. So now, everything you’re seeing is 100 times lower and the camera was taking each photo 100 times faster and you are seeing changes 100 times smaller than you normally would. When you can take photos so quickly to get those little changes between each frame, that’s really what slo mo is doing.
Finally, worth mentioning that timelapse is the opposite. In that case you take photos very slowly, like 1 photo every 10 seconds, and then play all those back at 30 per second. Now one second of your video is actually 300 seconds (five minutes) of what you were showing or an hour every 12 seconds. Do an even bigger gap between photos and you can compress the time even further.
More pictures per second make a clearer picture of the whole event.
Less gap between pictures equals more to look at, so you can make it really slow, because there are more pictures to see.
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