When you adjust the speed of a clip, especially when slowing one down, has the movement of your clip seemed choppy? How do you smooth out that movement in Adobe Premiere Pro? In this video, author Jeff Greenberg compares frame sampling and frame blending, and explains how they work in Adobe Premiere Pro.
- When we change the speed of clips, particularly slower, Premiere starts to duplicate the frames you see. So at 50%, you're seeing every frame twice. This leads us to number one. There are fixed, preset speeds that look best. That's going to be 25%, 33%, 50%, 66% and 75%. And the reason that they do, is they divide perfectly and evenly across the frames you have.
So, what if you want to use a different value, or even as things get slow, you're going to find it looks very strobey. That's where we begin to talk about different types of interpolation, for the way speed is processed. Here in Premiere Pro, I happen to have my skateboarder. And I'm going to play this through. I'm going to hit a command or a control bar to bring up my speed. You can see my speed is at 20%. And currently, I'm set with a time interpolation of frame sampling. I'm going to go ahead and hit playback.
And we're going to find that it's going to be pretty strobey. I'm going to go full screen. If you're not familiar with this, the accent grave key, wherever your mouse is, puts it full screen. But if you add the control to it, it'll do whichever monitor, and completely take up the interface. I'm going to go ahead and hit play here. And there's a lot of strobing going on in that playback because we're seeing every frame five times. On this second clip, I'm going to hit control r on the P-C, or command r on the Macintosh to bring up my clip speed duration dialog box.
I'm going to switch this second one from frame sampling to frame blending. And say OK. Now before I do anything further, I'm just going to move forward a couple frames, right to about here, and go full screen. And you can see that his hand sort of has a double image. And that's because it's blending the prior frame with this frame. It's kind of dissolving between the frames you have. So I'll hit an up arrow, and I'll hit play, and this should look just a little bit smoother as it sort of dissolves between the frames it has.
That's frame sampling and frame blending. And as we get a little bit slower, as we get into those slow speeds, say under 30%, you'll want to investigate optical flow, which is coming up next.
- Editing a four-point edit, fit to fill
- Changing clip speed and duration
- Changing the speed but not the duration
- Reversing speed
- Shifting pitch
- Exporting a still
- Optical flow
- Setting time interpolation
- Smoothing out variable speed changes
- Creating a reverse segment
- Building a sequence for HFR