More Slow Motion Clips

[jaelupo]

This is a follow up to kbrafford slow motion clips. Both of these clips were shot in 60i with manual settings and then brought into Vegas. Then I turned the clips into 24p and rendered at 40% of original speed. Very cool looking slowmo especially the clip where I am running forward and then I play it in reverse slowmo and run backwards (with sound). Check it out!

http://hv20.info/yopu/Foward-Backwards.mp4

http://hv20.info/yopu/Slowmo-cat.mp4

[skinnyboy]

Nice footage - thanks for sharing. The running backwards is pretty cool looking (and sounding).

Question: why not just shoot 24p and then slow that down in your NLE?
Better question: if you shoot 24p normally at 1/48, but then shot some at, say 1/60 and played it back on a normal 23.98 timeline, wouldn't that then be slo-mo?

[jaelupo]

Nice footage - thanks for sharing. The running backwards is pretty cool looking (and sounding).

Question: why not just shoot 24p and then slow that down in your NLE?
Better question: if you shoot 24p normally at 1/48, but then shot some at, say 1/60 and played it back on a normal 23.98 timeline, wouldn't that then be slo-mo?

It all comes down to frames per second. You want the maximum amount of frames per second when shooting slow motion. 24p is only 24 frames per second where the 60i is 30 frames which can be converted through pull down to 60 frames. You then make a 24p move out of it so it is shown in progrssive format.

Regrading 1/48 and 1/60 only have to do with the shutter speed. This helps, in fact the clip was shot at 1/60 to pick up more movement but it is not the same as frames per second.

[kbrafford]

Excellent footage! I think it would be cool to see the cat with a higher shutter speed (and maybe more ambient light to make up for it). Just for the scientific look I think it would be neat to see the tongue with less motion blur.

[jaelupo]

Excellent footage! I think it would be cool to see the cat with a higher shutter speed (and maybe more ambient light to make up for it). Just for the scientific look I think it would be neat to see the tongue with less motion blur.

I agree the Cat footage should be shot at a higher shutter speed. That clip was shot in the bathroom with just a 60 Watt overhead florescent light and no windows or natural light. I am actually shocked it looked as good as it did. I will try to re-shoot it with a higher shutter speed and more light to see how it looks.

The other day I filmed a helicopter that was hovering overhead with the shutter at full cork in the bright sunlight and you can see each of the blades rotating. I didn’t even have to slow down the video to see it because the shutter was going so fast. It looked like the thing was gping to fall out of the sky the blades were turning so slow. I will upload it so everyone can see it.

[pascalbrown]

great footage! It looks really really nice.

[Ian-T]

Nice footage. Good job. If you want silky smooth slow motion try shooting at 1/120 shutter speed. 1/48 and 1/60 are good for regular speed because they have that more natural filmlike blur...but when slowed down then the blur stands out more. I think 1/120 is the sweetspot for smooth looking slow motion. Higher shutter speeds than 1/120 will cause more of that motion judder look. In the end however it's all about what look you are after.

[jaelupo]

Nice footage. Good job. If you want silky smooth slow motion try shooting at 1/120 shutter speed. 1/48 and 1/60 are good for regular speed because they have that more natural filmlike blur...but when slowed down then the blur stands out more. I think 1/120 is the sweetspot for smooth looking slow motion. Higher shutter speeds than 1/120 will cause more of that motion judder look. In the end however it's all about what look you are after.

Thanks Ian. I will try 1/120 and see how it looks. Do you have a samples you can share?

[some1shero]

i've been looking everywhere regarding how to produce a good slow motion with the hv20 and there are still questions that i have regarding optimization of frames.

i come to realize that many people like to convert their footage to 24fps (or 23.976 whatever flavor you like more) via 3:2 pulldown from something that was shot at 60i.

then people use a NLE program to reduce the speeds by 40 or 50 percent to produce footage that is in slow motion.



now im not a math major or anything, but doesn't it make sense to capture footage at 60i (@ highest possible frame rate) THEN stretching the timeframe by 40 or 50 percent THEN do pulldown?



for example:

i have footage that is 10 seconds in length and i want to stretch it to 15 seconds:

if i use 24fps footage then i have 240 frames to stretch to 15 seconds. relatively smooth,

but if i use 30fps footage, then i have 300 frames to stretch to 15 seconds. would that not result in a smoother slow motion? THEN i would do my pulldown removal after the slow motion application.



am i just crazy or does this not make sense to anyone?

[kbrafford]

am i just crazy or does this not make sense to anyone?

Check this out:

http://www.hv20.com/showthread.php?t=437

[jaelupo]

i've been looking everywhere regarding how to produce a good slow motion with the hv20 and there are still questions that i have regarding optimization of frames.

i come to realize that many people like to convert their footage to 24fps (or 23.976 whatever flavor you like more) via 3:2 pulldown from something that was shot at 60i.

then people use a NLE program to reduce the speeds by 40 or 50 percent to produce footage that is in slow motion.



now im not a math major or anything, but doesn't it make sense to capture footage at 60i (@ highest possible frame rate) THEN stretching the timeframe by 40 or 50 percent THEN do pulldown?



for example:

i have footage that is 10 seconds in length and i want to stretch it to 15 seconds:

if i use 24fps footage then i have 240 frames to stretch to 15 seconds. relatively smooth,

but if i use 30fps footage, then i have 300 frames to stretch to 15 seconds. would that not result in a smoother slow motion? THEN i would do my pulldown removal after the slow motion application.



am i just crazy or does this not make sense to anyone?


I mentioned in my above post that you should use the 60i mode and not 24p. That way you get more frames per second. That is how I do all of my slowmo clips now.

[some1shero]

thanks for the answers guys! :hv20-smilie09:

someone should put up a "slow motion" workflow thread

[kbrafford]

I mentioned in my above post that you should use the 60i mode and not 24p. That way you get more frames per second. That is how I do all of my slowmo clips now.

Make sure you are generating the output correctly, too. I think I saw some "blending" in the cat video instead of interpolation.

[skinnyboy]

jaelupo,

Thanks for the clear answer to my questions. It makes sense to me now. I'll have to play around with slo-mo, too.

[mastroiani]

Can someone be so kind as to post a workflow for HV slowmotion for Final Cut users?

There are all kinds of FCP plug ins out there, TMTSFree and Nattress G Map Frames, but I am not sure they are the best. Actually Nattress is quite complex for me to understand.

It will be greatly appreciated.

Thank you

[Frank]

thanks for the answers guys! :hv20-smilie09:

someone should put up a "slow motion" workflow thread

Yeah, this keeps coming up; for example:

http://www.hv20.com/showthread.php?t=3156&highlight=slow+motion

[bmirman]

Okay, maybe I'm missing s omething, but I can't seem to shoot at 1/120 on my HV20. It goes from 1/100 to 1/250.

[jmalmsten]

Seems to me like you got a PAL camera which in a 180 degree shutter gives 1/50 at 25p... and you are looking for 1/100 actually for the 50i "overcranking"... as opposed to 24p 1/48 and 60i 1/120 of NTSC cameras...;)


The other day I filmed a helicopter that was hovering overhead with the shutter at full cork in the bright sunlight and you can see each of the blades rotating. I didn’t even have to slow down the video to see it because the shutter was going so fast. It looked like the thing was gping to fall out of the sky the blades were turning so slow. I will upload it so everyone can see it.

you mean like this guy? :D

http://www.youtube.com/watch?v=zQ61rShuxms

Russian space age tech... their rotors don't even have to rotate to make it fly...;)