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How to Best Use Twixtor for Extreme Slow Motion _ Philip Bloom

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Written by Philip Bloom Written by Philip Bloom 29 responses 29 responses Posted in: Posted in: Editing Editing, , Guest blog Guest blog, , Post tutorials Post tutorials How to best use twixtor for extreme slow motion How to best use twixtor for extreme slow motion 13 13 SEP SEP 2011 2011 I have used twixtor myself for a few projects but I have never had terrific success with it. One of the best filmmakers I know who uses Twixtor really well is my friend Salomon Ligthelm , whom I met when he lived in Dubai back in January last year. He put up a new video a couple of days ago, Gravity, and he was kind enough to write this guest blog post on how to get the best out of it. Twixtor will not give you as good results as a dedicated high speed camera of course. They do that job incredibly well. You need to light a lot to make them work but as you will read below you need to do the same with twixtor to get the high shutter speeds needed. But for those whose budget means renting a Phantom Flex or something similar is out of the question Salomon guides you through the best ways to make the most out this powerful, but tricky plug-in. Gravity – Director’s Cut from Salomon on Vimeo . Let me quickly explain how Twixtor works: It takes your footage [generally your transcoded 50fps, or 60fps footage and "guesses/interpolates" your missing/in-between frames I guess with every project the approach is somewhat different. When Twixtor becomes a part of my workflow I need to become increasingly more aware of the way I am shooting so that I have workable footage in post. I wanted to shoot something different to all the other Twixtor stuff I've been seeing - which have all been shot outside. I wanted to try shooting super slomo using the Canon 7D and Twixtor in interiors. Here are a few key things to consider when working with Twixtor: Shooting Workflow: 1. Shoot at a fast shutter: anything 1/2000 - 1/4000s. [so your lighting needs to be good] search for... Search Search Top Posts Top Posts 1. The elusive work/ life balance....can you achieve success AND have a life? 2. 10+ steps to becoming mega successful in video production and probably winning many awards whilst becoming super rich!! 3. The camera conundrum: which one to buy? 4. Video review of the BlackMagic Cinema Camera!! 5. Review of the Canon 5DmkIII now with full video review and footage 6. Review of Sony FS700! Both parts now live!! 7. Final short film for Sony using the FS100 "Portrait of a boxer" 8. Full Frame Shootout: Review of Nikon D800, D4 and Canon 5DmkIII 9. The tale of Lucasfilm, Skywalker Ranch, Star Wars and Canon DSLRs on a 40 foot screen! 10. Part 1 and 2 now live!! The Christmas mini shootout with the C300 (pre- production), F3, FS100, hacked GH2 and more!! 11. Which...lenses to buy? 12. Canon DSLRs: some of the best picture profiles out there 13. Lucasfilm's "RED TAILS" that I helped shoot on Canon DSLRS open's 20th January in the US! Go see it! 14. NAB 4: New Zacuto products including innovative follow focus on hand grip the
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Page 1: How to Best Use Twixtor for Extreme Slow Motion _ Philip Bloom

Written by Philip BloomWritten by Philip Bloom 29 responses29 responses Posted in: Posted in: EditingEditing, , Guest blogGuest blog, , Post tutorialsPost tutorials

How to best use twixtor for extreme slow motionHow to best use twixtor for extreme slow motion 1313S E PS E P2 0 1 12 0 1 1

I have used twixtor myself for a few projects but I have never had terrific success with it. One of the

best filmmakers I know who uses Twixtor really well is my friend Salomon Ligthelm, whom I met when

he lived in Dubai back in January last year. He put up a new video a couple of days ago, Gravity, and

he was kind enough to write this guest blog post on how to get the best out of it.

Twixtor will not give you as good results as a dedicated high speed camera of course. They do that job

incredibly well. You need to light a lot to make them work but as you will read below you need to do

the same with twixtor to get the high shutter speeds needed. But for those whose budget means renting

a Phantom Flex or something similar is out of the question Salomon guides you through the best ways

to make the most out this powerful, but tricky plug-in.

Gravity – Director’s Cut from Salomon on Vimeo.

Let me quickly explain how Twixtor works: It takes your footage [generally your transcoded 50fps, or 60fps

footage and "guesses/interpolates" your missing/in-between frames

I guess with every project the approach is somewhat different. When Twixtor becomes a part of my workflow I

need to become increasingly more aware of the way I am shooting so that I have workable footage in post.

I wanted to shoot something different to all the other Twixtor stuff I've been seeing - which have all been shot

outside. I wanted to try shooting super slomo using the Canon 7D and Twixtor in interiors.

Here are a few key things to consider when working with Twixtor:

Shooting Workflow:

1. Shoot at a fast shutter: anything 1/2000 - 1/4000s. [so your lighting needs to be good]

search for... SearchSearch

Top PostsTop Posts

1. The elusive work/ life

balance....can you achieve

success AND have a life?

2. 10+ steps to becoming mega

successful in video

production and probably

winning many awards whilst

becoming super rich!!

3. The camera conundrum:

which one to buy?

4. Video review of the

BlackMagic Cinema

Camera!!

5. Review of the Canon

5DmkIII now with full video

review and footage

6. Review of Sony FS700! Both

parts now live!!

7. Final short film for Sony

using the FS100 "Portrait of

a boxer"

8. Full Frame Shootout:

Review of Nikon D800, D4

and Canon 5DmkIII

9. The tale of Lucasfilm,

Skywalker Ranch, Star Wars

and Canon DSLRs on a 40

foot screen!

10. Part 1 and 2 now live!! The

Christmas mini shootout

with the C300 (pre-

production), F3, FS100,

hacked GH2 and more!!

11. Which...lenses to buy?

12. Canon DSLRs: some of the

best picture profiles out

there

13. Lucasfilm's "RED TAILS"

that I helped shoot on

Canon DSLRS open's 20th

January in the US! Go see it!

14. NAB 4: New Zacuto products

including innovative follow

focus on hand grip the

Page 2: How to Best Use Twixtor for Extreme Slow Motion _ Philip Bloom

2. Shoot against a plain/solid colored background – sky/wall etc etc.

3. Shoot at the highest point of action. The law of nature is that what must goes up, must come down. Its the

movement at the top of an arc/trajectory that works best for Twixtor because that’s when things generally move

the slowest, more frames of the relevant action for Twixtor to work with.

4. When you shoot really close/tight, slow the action down manually ie – move slower and fake slow motion [all

the tight sequences in 'Gravity' was done this way and then slowed down a little more with the tools]. Its easier to

get good results with Twixtor when the action is shot from a distance, because of the fact that the action will

happen across more frames – ie – Imagine moving your arms up and down – a distance 50 centimeters right in

front of the camera – the camera will only catch SOME of that action as your arms pass by the front of the lens,

for maybe 1-3 frames. However if you move away from the camera and shoot say 10-15 meters away from the

lens, you would catch the ENTIRE action across say 7-10 frames – giving Twixtor more information to work with

5. Shoot at 50 or 60fps. When you shoot high-speed you give Twixtor more info to work with – it is a shame that

you have to forgo resolution

6. Shoot as much as you can – try to get the action from different angles – reshoot stuff if wasn’t working, or if

your settings weren’t correct. SHOOT MUCH!

Post Workflow:

1. Use Twixtor in After Effects – for some reason Twixtor works best in After Effects – for me at least. Probably

because After Effects’ ability to manipulate time is so effective.

So here’s what I do in a typical scenario.

- Edit the entire piece in an NLE [Non-linear Editor - like Final Cut] and then I’d

leave sections in the timeline open, or maybe reference clips that I want to

work with eventually in After Effects using Twixtor – you can’t do too much in

FCP at this stage because we’re going to be playing with time-changes – which

can screw up things if you don’t work carefully]

- Move the whole piece over to After Effects via an XML script called Popcorn

Island FCPtoAE. You need to export an XML from FCP by going to File >

Export > XML [ for FORMAT click Apple XML Interchange Format, Version 5]

- Open AE and go to scripts – look for FCPtoAE and then pull up the exported

XML

- Now click on the clip you want to use Twixtor on: from the MENU go to LAYER

> TIME > ENABLE TIME REMAPPING. This allows you to extend a clip our for

longer – because when you start slowing stuff down, the clip needs to become

longer, which you can now easily do by enabling time remapping – just pull out

the edges using the drag function on the clip

2. Check that your Twixtor settings match your footage ie – Make sure your frame rate is correct when you set up

Twixtor’s settings. If its not correct then Twixtor will stutter across your footage

- I typically shoot and edit in 23.976fps because I like the film aesthetic.

- I generally find that manipulating the image to a slower speed – say anything

between 2-5% yields better results than trying to get something workable at

30%. I don’t know why that is, but I reckon it has something to do with the fact

that with many more frames created it uses those created frames to reference

about 4 hours ago from Tweetbot for Mac

about 4 hours ago from Vimeo

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about 4 hours ago from Vimeo

"Tornado"

15. "How to start a revolution"

wins Best Documentary at

Raindance and Boston Film

Festival!

16. Which lenses for your GH1/

GH2/ AF100/ AF101 etc...?

17. Canon C300 review and

short film "Le Mont, La Pluie

et La Nuit"

18. To buy a Scarlet or not to

buy, that is the question...

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Cracking little piece made at my

vancouver 2 day workshop!

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Page 3: How to Best Use Twixtor for Extreme Slow Motion _ Philip Bloom

from in order to create more ‘interpolated/guessed’ frames.

3. Consider using an aspect matte to hide warping. I often use an aspect ratio of 2.4:1 in my work as a lot of my

warping happens at the edges of my shots, thus a matte will hide the really bad sections. One instance of this

was a shot in the short of mine called [Fo'tis'ma], where my good friend Franzwa is taking off from a ledge [Its the

tight - slightly angled down shot at 34s]. The warping on his hand was REALLY bad – especially because the

shot was rather tight and he was coming down at such a pace. It was because of that shot not working at 16:9

that I decided to make the whole piece 2.4:1 [IMAGE 1 & 2]

4. Avoid warping by editing well. Many times Twixtor works for only a few frames – if that’s the case I’ll only use it

for a few frames and will cut to the next image – to avoid things looking crappy [obviously this must be done

tastefully]. Don’t hang on too long on a shot that was good to start with but warped into mush at the end – EDIT

WELL.

I trust this helps some of you out.

For more info on other parts of the creative process [color, editing, sound design] check out my blog

www.salomonligthelm.blogspot.com

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Comments

ELLIOTT.G.MONTELLO 2 YEARS AGO

Thats a cool vid, My friend Danny and I attempted to twixtor fire and water for a challenge, as its

difficult to predict, I don’t think its been done in the same video before – so its worth a look:

http://www.vimeo.com/21919856 – I also posted up a tutorial here: http://vimeo.com/23151793

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PAUL WOOD 2 YEARS AGO

Philip, thanks for posting this. I am currently in the process of learning twixtor, so this is great

information. nice one. And thanks to Salomon too or course.

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CLINT 2 YEARS AGO

This is a great guest blog post, the video is great too.

I love when you post tutorial stuff up here it is awesome to see something done but even more

awesome to see how.

Thank yous all around.

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CLINT 2 YEARS AGO

I would also love to hear about the color grading you did on this project and the other one those

are also very very nice.

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PETTER MISJE 2 YEARS AGO

I’m gonna learn how to use Twixtor!

On a different note – I have some footage shot indoors in the wrong shutter speed. The result;

wavy lines moving across the picture.

Does anybody know if there is a fix for this???

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PRESTON KANAK 2 YEARS AGO

Are they rolling bands? If so, here is one video tutorial on how to make it less

noticeable. http://vimeo.com/13717050

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PETTER MISJE 2 YEARS AGO

Gonna check this out straight away – thank you so much!

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Page 5: How to Best Use Twixtor for Extreme Slow Motion _ Philip Bloom

TIMOTHY BATES 2 YEARS AGO

Looks great. With slo-mo in mind, not sure whether to buy the Canon XF105 or the Sony NX70.

The Canon can’t do slow-mo like the Sony and 200 fps looks pretty good even without Twixtor.

http://vimeo.com/26495111

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TREVOR MACDONALD 2 YEARS AGO

I’ve had luck using the “Time Warp” feature in After Effects in place of Twixtor. I don’t have the

cash for Twixtor, and Time Warp is already part of AE. It delivers decent results, as well! Check it

out:

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QUIM BEL 2 YEARS AGO

All of your post are helpful, but this one it’s really helpful to me! I’ve been playing around with

optical flow and Twixtor a lot with different results. I’ll try this tips for sure next time!

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DOWIE 2 YEARS AGO

Salomon you are a guru. If anyone has Apple Motion, you can use Optical Flow to get the same

results as Twixtor. Check this super slow longboard sliding vid out..

http://www.vimeo.com/13359521 it’s all done with Optical Flow.

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CONRAD 2 YEARS AGO

thank you both for that post, was very helpful. and salomon’s vids are great

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DEREK HILLIER 2 YEARS AGO

I agree the new Motion or FCPX has the optical flow that shake had very cheap and easier way to

do it, at AE hates you making clips longer so you have to do a bit of a work around

Page 6: How to Best Use Twixtor for Extreme Slow Motion _ Philip Bloom

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ARON ANDERSON 2 YEARS AGO

I like you Philip never got the best results. I am so glad you posted this It helps out a lot. Thank

you.

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MIKE 2 YEARS AGO

Hi, I used twixtor with FCP and I think it worked just fine, you really need solid background as it

was said before, fast shutter of course helps as well. Check this out: http://vimeo.com/21024158

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AMILA C KUMARASINGHE 2 YEARS AGO

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BERNARD 2 YEARS AGO

Amazing film and a great write up. I hope to be able to test twixtor myself one day… Just need to

get more lights…

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ART BELL 2 YEARS AGO

This is so interesting. We go back and forth between Twixtor and Optical image flow in Motion a

lot and i have learned similar – and a few different things – coming from DSLR in my case.

Love the ‘highest point of action’ thought thats brilliant – as the slo mo just increases the tension

already here. Thanks.

1.Most importantly as Salomon infers ‘jello happens’. To minimize it – high contrast, simple

backgrounds and get close.

2. In our tests i have found no algorithmic difference between the two – jello in one – jello in the

other – its how you shot not the math that is doing you in.

3. for the 7D – any shutter over 800 seems to degrade the quality of the image. Don’t ask me why

but there just seems to be less info there. If its a good hi con, close shot – let the math do the

work – take it to 1% as above – it will hold.

4. We found the roundtripping in FCP and Motion to be easier ( less tech) so thats where we have

Page 7: How to Best Use Twixtor for Extreme Slow Motion _ Philip Bloom

ended up.

We have our workflow here http://vimeo.com/22811341 if you want to see the Apple centric step

by step workflow.

Thanks, LOVE slo mo’s!

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DRAZEN 2 YEARS AGO

love this video and I cant wait to apply some of this twixtor wisdom to one of my next projects

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ROB KACZMARK 2 YEARS AGO

Wow, this is a great tutorial. Thx so much Phillip

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PHILIP BLOOM 2 YEARS AGO

thanks Salomon. Not me!

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KYM FIELKE 2 YEARS AGO

This incredible BASE jumping piece has gone viral in the past several days – good Twixtoring and

colour grading of GoPro-only footage: http://vimeo.com/29017795

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MATT POPAY 2 YEARS AGO

Salomons work is incredible.

I’ve already played around with Twixtor ( http://www.vimeo.com/17811423 ) but can never get the

same results.

Will be following these tips to the letter!

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LANCE 2 YEARS AGO

Can someone please explain to me why one needs to have Twixtor for super slo-mo as a plug in

to Adobe After Effects when said effect already exists in Adobe After Effects?

Macdonald’s video proves the point to me. After Effects alone is pretty good and I can see just as

many artifacts in AE as I do in Twixtor vids.

Also – if I MUST get Twixtor (and I’m not yet convinced) do I need to have AE or will it work as a

plug-in for CS5.5 alone?

Twixtor’s website is not very helpful for these questions.

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BERNHARD B. 2 YEARS AGO

Philip,

I’m struggling to get decent lighting indoors when using such shutter speeds, may I ask what you

used?

I’m trying to capture some scenes shot at night time with no outloor light pouring in, so it’s all

some 500W lights filling the room. Even though I have to compensate by boosting the ISO a lot

the images are still too dark at say anything faster than 1/800

Page 8: How to Best Use Twixtor for Extreme Slow Motion _ Philip Bloom

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PHILIP BLOOM 2 YEARS AGO

Am afraid for shutter speeds that high you need big strong lights. 1kw and upwards!

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BERNHARD B. 2 YEARS AGO

Figured you’d say that, ah well, obvious I guess

Cheers!

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PARIS 2 YEARS AGO

Philip,

“Shoot at a fast shutter: anything 1/2000 – 1/4000s”

how about GoPro?

I’ve been shooting a lot of videos by using 60D/550D/GoPro & im trying to use Twixtor..its work

but my video still have a “smart blur/melt blur”(i dont know how to called it,sorry)…Can you help

me how to clean the “smart blur/melt blur” after using Twixtor..

Thank you

Sorry for my english….

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ALEXEY PRAPRIN 2 YEARS AGO

So, guys, if i use 5DmkII with native full HD + 24 fps, if i use good settings for shutter speed

(1/1000 – 1/4000) and ISO…can i reach good results using Twixtor or not? Because till this

moment i only had weird results with many many big blending ghosts…it looks like kinda

morphing)) but not a slowmo)

thanx

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