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In this movie we are going to look at changing speed using variable rates. And there are some basic and some more advanced techniques that we'll go over. If you need to make a clip just a certain length, and for instance, I want this clip to be longer or shorter, and I want to slow it down or speed it up, precisely there is a really cool tool called the Rate Stretch tool. And it's this button right here. It looks a little bit like an X, and the keyboard shortcut for that by the way is the letter X. So if I switch to the Rate Stretch tool, and I go ahead and put my cursor at the very end of the clip on the edit point, I am going to go ahead and drag it.
Now, we are used to seeing when we drag a clip, we are actually just making it longer and adding more media to the end if it's available. This is doing something very different. As soon as I let go, I want you to take a look right here, you can see I've slowed the clip down to 37%, because I've stretched out that one clip so that plays slower. Let's go ahead and play this back. It's a couple of bicycle riders going by. They are pretty eco because they are not using gas. So let's go ahead and play that back. And this is something that's really cool when you slow it down, people walking, people on bikes, slowing down kind of makes the moment a lot more magical.
I am going to go ahead and pause this, and I am going to pull this Rate Stretch tool the other way just so you can see how it can be used to speed something up. Now, I probably wouldn't do it on these bicyclists, but I am going to go ahead, pull it all the way to the left, and zoom out and press the Backslash key so it fills the whole frame. And you can see that it has now been sped up to over twice as fast as it's original speed. I am going to go ahead and press the Spacebar so you can see what it looks like with these bicyclists sped up.
As long as I don't push it too much. that actually didn't look very unrealistic. It actually looked like they could have been driving by at a pretty good clip. Now, speaking of clips, I want to do a variable speed change on this clip, which means I want the bicyclists to go at a specific speed initially and then maybe slow down as they come closer to the camera and then go back to the original speed or maybe even go off camera even faster. So what I want to do is I want to go back to the original speed, and I am going to simply select the clip. Now, I need to make sure I switch from my Rate tool to my Selection tool, and the Selection tool once again is the keyboard shortcut of V, and now I can select the clip and right-click on it, and I can simply go Speed/Duration and type in 100.
So now we are back at the original speed that it was shot at. I am going to hit the Backslash key so you can see the entire clip, and now we are going to go ahead and vary the speed of the clip as the bicyclists ride by. Now, I can do this directly on the Timeline, and that's pretty cool, but I am going to show you that you can actually do it in the Timeline and in the Effects Control panel. So let's go ahead, let's double-click to load the clip back into the source monitor, click on the Effects Control panel, and I am going to reveal the Time Remapping twirl down, where we have Speed here, and just so you can see what's happening I am going to click one more time so you can see all the information.
So you can do this up here, but I find it's much more efficient to do it down in the Timeline, especially if I am trying to time it to a narration, to music, or to other clips. So once I am in the Timeline I have an option to view my clips and Show Keyframes or Opacity Handles, or you might have actually hit everything if you watched some of the earlier movies and I pointed out that it's always good to hide your keyframes when editing so you don't accidentally change them. So what I want you to make sure is that you have Show Keyframes selected and then over here on the right-hand side I have another dropdown menu, and I can Show the Keyframes for my Opacity, but I can also Show it for Motion, and in this case we want to do it for Time Remapping.
And, of course, we are going to select Speed, because that is the one choice we have. Now, the yellow line moves a little bit, but this yellow line now represents the speed that the bicyclists are riding. So that you can see things better, I am going to readjust the Height of my tracks in my Sequence. I am going to scroll down and get rid of the audio. We don't really care about the audio, and I am going to go ahead and grab the very top of the area between the Video 1 and Video 2 track and drag up. This way I can make the clip nice and tall, and it's very easy for me to actually keyframe within the body of the clip.
So the first thing we want to do is we want to determine where we want the clip to perhaps slow down and where we want it to speed up again. To do that, you are going to place a keyframe directly on that spot. Now, a keyframe you can think of as just a specific mark where you want something to change over time. In this case I want the speed to change at that specific point. Now, to put a keyframe on a clip, you could switch to the Pen tool, but there is a great keyboard shortcut and that's simply holding down the Command key on a Mac and the Ctrl key in Windows and just clicking where you want the keyframe to be.
I want them to slow down right about there, right as they come into the sun. Hold down the Command key, and I am just going to click. You'll notice up here are two little yellow triangles that are kind of touching each other. Now, this is my keyframe, and if I don't do anything else absolutely nothing will happen. But what I really want is it to slow down, so I grab this bar and take a look at my Timeline as well in the Effects Control panel, because it's reflected in both places. I pull this down, and I am getting a readout, which is this number, and I want it to go down to 50%.
So I've just slowed this clip down to 50% right at this point. And just like we learned in the earlier movie, the clip could get longer to take advantage of that space. So let's go ahead and hit the Backslash key so we see the entire clip, and I am going to play around that keyframe. And there you go, they slow down. Now, maybe I slowed them down a little too early, so if that's not the point where you want the clip to go, I can go ahead and grab that keyframe, but before I grab it I have to hold down a Modifier key-- it's the Option key on a Macintosh and the Alt key in Windows--and now I can grab that, and I can reposition where I want that moment to occur of them slowing down, and maybe it should be right here, when that second bicyclist comes into frame.
So I've literally moved the keyframe or the moment in time when things slow down, and let's take a look at that and see if I like it a little better. I do like that. I am going to go ahead and slow it down a little bit more. But there is one thing I don't like about that--actually, I think slowing it down to 1% is a little bit crazy, 30% is good--is it slows down abruptly. It literally goes from 100% Speed to 30% Speed in one frame. And that's okay, but that's not variable, and sometimes depending on the shot, it's too jarring.
If I go ahead and grab either side of this little triangle and drag away from the center, you'll notice that I get a little bit of a curve, and now I get a speed ramp. Instead of it going dramatically from 100% to this 30%, it's actually going to slow down progressively. Let's go ahead and watch that. And you really have detailed control, because if I click on either half of the keyframe, I see a little blue Bezier Handle, and this allows me to control the curve, how aggressively or how subtly it transitions from one speed to the other.
And if I want them to come back to normal speed again, I just pick the part of the frame where I want normal speed to happen, once again, hold down the Modifier key-- the Command key on a Mac, the Ctrl key on Windows--create a new keyframe, and then I can go ahead and bring this back up to normal speed, or maybe in this case I really want them to exit frame very quickly, so I am going to go ahead and bring it up to over 200%. Little bit of gradual adjustment there. Let me go ahead and move the playhead out of the way, and to give us a little bit more fine control, I am going to press the Plus key to zoom in, and now I can grab the edge, stretch it out to the right, and now I am going to go ahead and press the Backslash key so we can see the entire clip, hit the Spacebar.
There they go, they speed off screen, and again, I have that little Bezier Handle to control it. So creating variable speed is really easy, and I do recommend doing it in the Timeline, but what about if you want to reset everything back to square one? Well, that's really easy to do also. Simply go up to your source window and go right here on this stopwatch, which is selected, and click on it. You'll get a warning box that says this action will delete existing keyframes, which is exactly what we want to do, and simply press OK.
Don't panic if you do this by accident. You can always press undo and get your keyframes back, but this is a great way of starting over again if you've really created crazy keyframes and want to start fresh.
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