Straightforward Slow-motion method

M

mkurtz

Member
Hello. I have been reading a lot about doing smooth fluid slow-motion using the DVX100a. It makes perfect sense to me to shoot in 60i, then make each field a full frame to create 60p, then dropping the 60p footage into a 24fps and slowing it down to 40%.

However there seems to be no real tutorials on how to do this, or the information out there appears to be oversimplified with no real details, and no way to confirm that you have done the job properly at each step.

Assuming I have virtualdub, AVI synth, Premiere Pro, and After Effects, I have two preliminary questions:

1. How do I make the 60i footage I captured into 60p footage. How can I verify that I have done this properly?

2. After I do this, shouldn't my footage be "twice" as long in running time? Since I have converted 60 half-fields into 60 full fields, my ten second clip should have double the number of frames and therefore should be twenty seconds long. (I know that logic is flawed somehow, but I don't know why)


lets start there, and see what everyone out there can teach me! : )
 
Your ten second clip would still be 10 seconds ... if actually increased the way you're saying, then your audio would be WAY out of sync, or the speed of it would be cut by 50%.

Again, no lengthening in time happens from what you're talking about. However, are you prepared to lose some of your resolution with the 60P conversion? If Barry or another Mod chimes in, they can explain how going from interlaced to progressives loses resolution ... I don't know how, but I've heard it explained before. May as well just drop your 60i footage onto a 24P timeline (Sony's Vegas can do this), then slow it down in the same 24P project.

OR shoot 30P, but only have it SLIGHTLY reduced in slow motion.
 
I have Barry's Book and DVD. In fact, that is what got me interested in doing some slow motion tests. But the book and DVD only explain the theory behind how to do it, they don't say how to use tools (like virtualdub, etc...) to perform the steps.
 
i used twixtor. its a plug-in for adobe premiere, after effects and it probably works with a few other NLE's

matthew
 
I know that you want real slow motion, but there is a program called "retimer" that gives amazing results... you may also want to check that out.
 
in the book it says to a PAL user to shot at: 50i and shutter of 1/100. i can only manage to get the shutter to 1/100.2 and when i import the footage and slow it down by 50% its not that smooth at all. i import it into adobe premeire 25p timeline.
is there a way to get it to 1/100 ?
 
mkurtz has put together an excellent step-by-step tutorial. Every NLE handles the process differently, some are easier than others, and some do it better than others. mkurtz has spelled out a way to do it using freely-downloadable programs that should result in excellent quality footage.
 
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