Slow-mo Settings For PAL DVX100A?

A

andybiz_2005

Well-known member
Hi all,

I know that when using an NTSC DVX100A, the settings for slow-mo are as follows :

Slow motion was taken at 60i into a 24p timeline in vegas, and slowed to 40%, with a 1/120 shutter speed.

My question is what are the equivalent settings for slow-mo when using a PAL camera that records 25p, or 50i? Would the settings be something like slow motion taken at 50i into a 25p timeline in (whatever NLE) & slowed down to 50%, with what shutter speed? What if I record 25p originally & bring that into a 25p timeline & slow it down. Would the video look too jerky this way?

Thanks for your advice.

Andrew
 
That totaly depends on you. I don't think that there is a global static setting for slow-mo.

If you capture it in 50i and convert it to 25p with an external program. And if you import that 25p to your editing program, it'll be better. You'll see a smooth slow-mo. And if you want moreeee! Than use timeline scaling..

And for the shutter speed.. As you know, faster speed creates a sharper image, when iris is fixed. First try it with a very fast shutter speed with iris wide open, and also try another one with slow shutter speed with small iris.

So choose the best for you!

Have fun! :)
 
just remember to deinterlace the footage . if you don't, it can be at any spped and still won't look smooth
 
Thanks David & Nightwalker for your helpful suggestions. I read in this forum also that shooting in interlaced compared to progressive mode gives a smoother, more convincing slow motion. Do you agree to this? Is it also true that if I originally recorded my footage using 25p & in my NLE (Adobe Premiere Pro 1.5) if I apply slow-mo to 25p footage in a 25p timeline in Premiere that Premiere automatically converts that portion of the slow-mo to interlaced?

How about if I want to speed up footage in my NLE, would recording in a slower frame rate (25p instead of 50i) give a better looking speeded up video? Thanks in advance.

Andrew
 
andybiz_2005 said:
Thanks David & Nightwalker for your helpful suggestions. I read in this forum also that shooting in interlaced compared to progressive mode gives a smoother, more convincing slow motion. Do you agree to this? Is it also true that if I originally recorded my footage using 25p & in my NLE (Adobe Premiere Pro 1.5) if I apply slow-mo to 25p footage in a 25p timeline in Premiere that Premiere automatically converts that portion of the slow-mo to interlaced?

How about if I want to speed up footage in my NLE, would recording in a slower frame rate (25p instead of 50i) give a better looking speeded up video? Thanks in advance.

Andrew
Click to expand...

If you open a Progressive project in premiere pro, it won't convert anything to interlaced!

As i said, you'd better shoot at 50interlaced frames and convert that file to 25progressive frames with the help of another software. And finally you'll have a 25P video file to import to premiere. This will probably give you the smoothest experience. But if you "ALSO" want it slower, scale the timeline in premiere.. ( but as i said, this is not necessary. Do it if you want it slower )
 
To add:

If you don't use premiere's timeline scaling, just converting 50i to 25p with the help of another tool will give you %50 slow movement. ( the smoothest slow movement that you can achieve by "nature" with dvx100 )
 
Erm, Nightwalker, when you mention using Premiere's timeline scaling, do you mean that you select a clip on the timeline, right-click on it & select "Spead/Duration" from the context menu & from there adjust the speed to less than 100% (50% for example) & click "OK"? Because that's what I've been doing all along to slow-mo my footage, or to speed it up. Thanks.
 
andybiz_2005 said:
Erm, Nightwalker, when you mention using Premiere's timeline scaling, do you mean that you select a clip on the timeline, right-click on it & select "Spead/Duration" from the context menu & from there adjust the speed to less than 100% (50% for example) & click "OK"? Because that's what I've been doing all along to slow-mo my footage, or to speed it up. Thanks.
Click to expand...

Exactly.

You can change the speed of the clip by right clicking it and so you can expand the duration of that clip.

But if you also shot in 50i. and convert it to 25p before importing to premiere pro, you'll get a very attractive motion. Something like a slowly melting ice-cream :) :violin:
 
QUOTE:"But if you also shot in 50i. and convert it to 25p before importing to premiere pro, you'll get a very attractive motion. Something like a slowly melting ice-cream"

That sounds cool. I would like to try that, but what 3-rd-party softwares can convert 50i to 25p properly so that the effect looks very good? Can Adobe After Effects 6.5 do the conversion?
 
andybiz_2005 said:
QUOTE:"But if you also shot in 50i. and convert it to 25p before importing to premiere pro, you'll get a very attractive motion. Something like a slowly melting ice-cream"

That sounds cool. I would like to try that, but what 3-rd-party softwares can convert 50i to 25p properly so that the effect looks very good? Can Adobe After Effects 6.5 do the conversion?
Click to expand...

You are using MAC or PC?
 
Ok. I'm giving you the link to a video that i made with virtualdub and adobe premiere to show differences.

I did not shoot the video source. I found the original video through google. Which was said to be shot at 50i with a sony camera.

I used avisynth to seperate fields.
I used virtualdub to convert frame rate to 25fps.

I imported that final 25fps movie to premiere.

In the video. The first clip is the default 50i (25fps) frame, which was deinterlaced by right clicking and changing the frame options ( always deinterlace ). And after this deinterlacing, i resized it's duration to %200 (speed to %50).

The second clip is the avi directly imported after virtualdub process. No any other effects or changes in premiere.

The third one is just the same one at the second row except it's %50 slow (setted with premiere, like the one at the first row).

Starting from the 21th second of the whole video, watch the difference between the left-most 2 clips. You'll notice that the first one is jumping frames. Not smooth. The second is perfect.

http://hayalet.net/ext/slowmotest.avi
 
Wow, thanks nightwalker to this excellent & clear post on the video comparisons. I did a search on google on avisynth & virtualdub. I love it that these tools are all free & doesn't require that I have to purcahse expensive 3-rd-party s/w to get the results you explained here. Although, I'm really a complete noob at any form of computer scripting/programming/coding. I studied IT & in my first year had to learn three programming languages (Visual Basic, C++ & Java) & also pass them during the final exam. By sheer luck I passed them! Phew! So I have to force myself to familiarize myself with avisynth's scripting language.
 
andybiz_2005 said:
Wow, thanks nightwalker to this excellent & clear post on the video comparisons. I did a search on google on avisynth & virtualdub. I love it that these tools are all free & doesn't require that I have to purcahse expensive 3-rd-party s/w to get the results you explained here. Although, I'm really a complete noob at any form of computer scripting/programming/coding. I studied IT & in my first year had to learn three programming languages (Visual Basic, C++ & Java) & also pass them during the final exam. By sheer luck I passed them! Phew! So I have to force myself to familiarize myself with avisynth's scripting language.
Click to expand...

:thumbsup:

By the way,

These are the very basic lines i used for avs file.

Put--------from---here

AVISource("50i.avi")
separatefields

----till-here

to avs file. open that file with virtual dub.
Go to filters and add "field bob".
Go to filters and add "resize". You'll see why you need this.
Go to frame rate, change it to 25.

export it.

import it with premiere. Voilaaaaa
 
Hi Nightwalker. I've downloaded & installed AviSynth 2.5 already & I would like to know how to use it to convert an interlaced 50i video into 25p progressive. What is the command to type in? Do I still need VirtualDub to convert the interlaced fields to progressive? Thanks in advance.

Andrew
 
Did you try the procedures i wrote in my previous message? If yes, what was the problem? ( We need birtual dub, yes. )
 
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