24P slow mo

B

Bender

Member
Hello everyone I recently purchased a DVXb and have been reading a lot on this board and other places. You'll prob be hearing from me a lot!!

But my first question is 2-fold:

I realize that 60i footage will give you the best slo mo, but are there any tips that can make slo mo with 24P footage look as smooth as possible? Or, would it be better to shoot in 60i, do the slo mo (40-50% in Vegas), then render the clips as 24P and playback in a 24P timeline? Would doing that work or would it just give me the same end result as slowing down native 24P footage?

And similarly, putting the slo mo factor aside altogether, if i shoot 60i with the DVX, then render that footage to 24P and playback in a 24P timeline in Vegas, would there be a significant difference in the motion (as opposed to shooting in 24P)?

Thanks!
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wow i remebr i did it before i think i put the frame rate in the nle lower like 10 or so or something like that. I'll be honest i never liked the results.
 
Bender said:
And similarly, putting the slo mo factor aside altogether, if i shoot 60i with the DVX, then render that footage to 24P and playback in a 24P timeline in Vegas, would there be a significant difference in the motion (as opposed to shooting in 24P)?
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Click to expand...

60i converted to 24p in Vegas takes on the exact motion characteristics of 24p.

Now, as for doing slo-mo with 24p footage, it's not likely that you'll get good results unless there's not much motion. Some programs like Twixtor help, but the mathematical reality is that there just aren't very many motion samples in 24p, and the difference in position between moving objects from one frame to the next is just too great.

(Have you seen "Cars"? Take a look at the end credits. They have some slo-mo footage there, but they slowed down the movie footage which was rendered at 24 fps. It's choppy, and "Cars" was a HUGE release. There just wasn't anything they could do about it.)
 
David Jimerson said:
60i converted to 24p in Vegas takes on the exact motion characteristics of 24p.
Click to expand...
David Jimerson said:
Now, as for doing slo-mo with 24p footage, it's not likely that you'll get good results unless there's not much motion. Some programs like Twixtor help, but the mathematical reality is that there just aren't very many motion samples in 24p, and the difference in position between moving objects from one frame to the next is just too great.

(Have you seen "Cars"? Take a look at the end credits. They have some slo-mo footage there, but they slowed down the movie footage which was rendered at 24 fps. It's choppy, and "Cars" was a HUGE release. There just wasn't anything they could do about it.)
Click to expand...


So how would you suggest shooting a scene for slo mo in 60i, relative to shooting the other scenes in 24P? What i mean is, to get a uniform look when im shooting a music vid based on 24P, would i generally want to shoot the 60i parts with the same scene file settings as i'm using for the 24P shots? Or are some of the f5 & f6 settings optimized for 24P and not that great for 60i?

I know I can experiment and find this stuff out myself, but it would give me a head start to get opinions from those more experienced! Thanks
 
Not long ago i posted some slow-mo I did shooting 60i at 120th using after effects and twixtor. I dialed in a scene file for slow mo using the same settings I use for my 24p and 30p scene files. It came out really nice that way and mixed in with the 24p footage very well.

You just need to treat your dvx like a film camera. If you want to get a certain shot with slowed action switch over to your 60i setting all setup for slow-mo and do an audio or visual marker so when you goto edit you know that's the shot you did with intentions of slowing down.
 
Bender,

You should be able to drop some 60i footage into your 24p timeline and then slow it to 40%. That should render out very nicely as Vegas does great interpolation.

The After Effects/Twixtor route will have the best quality.

As mentioned, if you plan to do slow-mo, use a faster shutter speed, roughly in proportion to how much you will be slowing it down. Halve the speed, double the shutter.

Josh
 
so to get great slowmo, 60i 1/120 shutter, drop in 24p timeline, slow it down about 40%?
 
here's what i did...

slow-mo

oops...

what i did was shoot normal 24p footage and the sequence that i slowed i used winmorph. frame-by-frame. i still haven't shot footage with a high shutter speed to eliminate the blur. i'll do that soon. if you watched my volleyball tournament clip there's a slo-mo sequence in that which i used winmorph to create. i didn't clean up the frames too much. if you watch the player's legs that's quite clean, but her arm going into the spike i didn't clean up so you see the blur.
 
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JONJON said:
so to get great slowmo, 60i 1/120 shutter, drop in 24p timeline, slow it down about 40%?
Click to expand...

Yep, basically that's it, quick and dirty. After Effects might do a better job than your NLE, since it's got some "pixel motion" features to help with the interpolation, but that's the basic idea.
 
I keep my scene files the same except I add a little more detail to the 60i one I have some slow motion compared with my 24/30p settings. Works well for me.
 
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