Join Richard Harrington for an in-depth discussion in this video Retiming footage: Slow motion, part of After Effects Guru: Repairing and Enhancing Video (2014).
In our last movie we took a look at over cranked footage and we slowed it down a bit. Let's go a little over the top here and show you dramatic slow motion and i'll show you a couple of tricks to pull it off. I'll start with a shot that's also over cranked at 59.94. Right clicking and choosing interpret footage>main. And I'll dial in the new frame rate of 23.976. In this case I'm going to make sure that I'm not using any of the fields everything's fine and I'll click okay. Adding that to a new comp I'm going to slow it down a lot so using the stretch command here I'm going to stretch this 400%.
When you stretch, always go with a whole number. Now, if we play that, you're going to notice that it what it looks like is a lot of frames being repeated. So here it is playing in real time, and you see how those frames look jittery. This is the same effect you would get in an NLE if you slowed it down 400%. But we're going to turn on advanced frame blending and enable it. And now let's try it. And you're going to see that looks a lot better with that motion. But here's the trick. One of my favorite techniques is to just go ahead and artificially do this without having to have the render time of the advance frame blending which could be kind of slow.
Plus the advance frame blending sometimes has some of its own artifacts. So let's try the best of both. Let's remove the advanced frame blending using just the draft frame blending. Duplicate the layer, and bring up its in point. And I'm going to move the in point down one frame and set the opacity to 75%. Duplicating it again, I'll move that down to two frames, and set the opacity to 50%. Duplicate, three, opacity, 25%.
So now we have four copies of the footage, and we're just using a simple opacity blend. This is going to produce its own sort of streaking and motion effects. And it looks pretty good. I offer this an alternative to using advanced frame blending, and it's basically a way of doing a forced motion blur. You'll also notice that it renders substantially faster. And by ghosting the footage, you're creating an artifical motion trail. I use this all the time while working with time-lapse source material.
So there it is, a little bit of an artificial blur. And as it lifts here, you get a very slow-motion pour. Now remember, we're just looking at this at a smaller frame size, but it gives you a pretty good idea of what's possible and this is one more way to pull off a slow-motion effect.
This course was created and produced by Rich Harrington. We are honored to host this content in our library.
- Reviewing the retoucher's toolbox
- Stabilizing footage
- Fixing alignment
- Retiming footage
- Removing lens distortion
- Using rotoscoping to enhance footage
- Recovering exposure
- Color grading with Photoshop
- Converting to black and white
- Creating a film or painterly look
- Adding depth of field