September 22, 2014 at 6:39AM

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Frame Rates and Slow Motion

Hey friends,

I have some doubts on frame rates and slow motion.
If we shoot in more frame rates (1000p and more), the action will be in slow motion.

First question: My camera has maximum 60p. Where and how can I get more than 60p. Are they special cameras?

Second Question: And after I shoot, why do I need to edit them? I assumed that once I have shot in more frame rates, I can see the slow effect on the recorder file itself rather than bring it to the editing table and editing them to lesser frame rates?

Third: Ok now after I get the file to editing table…..what must be the lesser frame rate to give a smooth slow? Is 25p a good decent one?

Finally: Why don’t I have a smooth slow motion after editing? I don’t edit in Adobe Premier of Final Cut Pro but do it in MAGIX Movie Edit Premium 18?

Please refer: https://www.dropbox.com/s/6oi278xx3vg40i7/Frame%20Rates%20and%20Slow%20Motion.mp4?dl=0

Will appreciate your kind help.
Regards.

Anirban

9 Comments

To get more than 60p with your own camera you need to purchase the software Twixtor, which can easily double or triple the frame rate, though you must use the correct shutter speed when you shoot for Twixtor processing.

Otherwise, high quality slow-motion requires renting a specialized high-speed camera and high-speed lighting to go with the camera. These cameras are in the $20K - $60K price range, so buying one is out of the question.

There is also the Sony FS-700 camera that can shoot up to 240 fps, but it's also in the $8K+ price range to buy, so you will probably want to rent one of these.

September 22, 2014 at 11:05AM

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Guy McLoughlin
Video Producer
31252

Thanks Guy but how do I install Twixtor in my camera?

Anirban Ray

September 23, 2014 at 8:07AM

Twixtor isn’t the only software that can do this. You make it sound like it’s the only option. Final Cut Pro X and After Effects have similar effects (although Twixtor’s I’ve heard is a little better).

Ryan Toyota

September 27, 2014 at 8:21AM

Twixtor is post production software that will take your footage and create higher frame-rate versions of your video.

So say I shot with my camera at 60 fps, but I want this to be 180 fps, so I bring my footage into Twixtor and it will create the missing frames to turn my 60 fps into 180 fps.

The only thing you need to remember is to use the proper shutter-speed for your final frame rate, so if you are shooting 60 fps but you want to have 180 fps when Twixtor has finished, then you need to use 1/180th of a second shutter speed ( or faster ) when you shoot your 60 fps footage.

I've seen some really good Twixtor slow-motion footage.

Twixtor Samples on Vimeo
https://vimeo.com/search?q=twixtor

Twixtor Product Info
http://www.revisionfx.com/products/twixtor/

September 25, 2014 at 3:32PM

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Guy McLoughlin
Video Producer
31252

Here's a better Vimeo link for Twixtor Samples...
https://vimeo.com/search/sort:likes/format:thumbnail?q=twixtor

September 25, 2014 at 3:36PM, Edited September 25, 3:36PM

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Guy McLoughlin
Video Producer
31252

Guy have right, twixtor is a good options for low budget having in count they limitations with artefacts...

September 26, 2014 at 3:33AM

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Ragüel Cremades
Film producer and director
7645

There are a few things at play here. The frame rate of your footage, the frame rate of your final video, and how you choose to conform your footage.

Your camera will record up to 60p. When you record 60p footage, it’s not slow motion until you slow it down. On a computer it will still play at normal speed, just with twice as many frames and more realistic detail in the motion.

It becomes slow motion when you slow it down in editing software or conform the footage to another framerate using software that conforms footage. How you choose to slow it down will depend on a couple things.

What framerate are you exporting at? American television plays at 30fps, movies are typically 24fps (although Peter Jackson released the latest Hobbit movie in 48fps). There are other framerates, but 30fps and 24fps are the most common.

Let’s say you decide to create your video to be 30fps. If you take your 60fps footage and conform it to 30fps, it will be half-speed slow motion. Alternatively, you could bring the 60fps footage into your editing software and slow it down to 50% speed. I’m not familiar with how other editing software handles this situation, but I know FCPX will take the extra frames (that it would have thrown out in a 30fps timeline) and use them to stretch out the footage to fit 30fps. Then when you export, you have a smooth 30fps video at half speed slow motion (1 second of original video turns into 2 seconds of slowed down video). If you decided to conform to 24fps, it would be a little slower, as 1 second of original video would give you 2.33 seconds of slowed down video.

But half speed isn’t your only option. Most editing software will have algorithms that will fill in the gaps if you decide to stretch out your footage to 25% or 10%. How well those effects will look depends on how much you’re stretching out the original framerate, and what algorithm it’s using to calculate the missing frames. As Guy mentioned, one of the best algorithms for calculating missing frames is Twixtor, which is a plugin you can download to slow down your footage a little further.

Let me know if this makes sense. I tried to be fairly complete in my explanation without being to detailed.

September 27, 2014 at 8:37AM

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Ryan Toyota
Graphic Designer / Typographer / Video Editor
1257

I should clarify that 25% and 10% are also just examples. You could really slow it to whatever you want. But like I said, it will depend on how many fake frames you’re generating and what algorithm you’re using to do it. Let me know if you’d like me to explain what I mean by “fake frames.”

Ryan Toyota

September 27, 2014 at 8:40AM

Twixtor is the way to go, though it's a pretty penny (upwards of $400). I have yet to buy a copy for myself, but plan on doing so soon as the HFR cameras are certainly a much larger investment.

October 28, 2014 at 6:47PM

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