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Slowing and accelerating video speed

Slowing and accelerating video speed provides you with in-depth training on Video. Taught by Chad Pe… Show More

After Effects CS5 Essential Training

with Chad Perkins

Video: Slowing and accelerating video speed

Slowing and accelerating video speed provides you with in-depth training on Video. Taught by Chad Perkins as part of the After Effects CS5 Essential Training
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  1. 5m 40s
    1. Introduction
      1m 30s
    2. What is After Effects?
      3m 12s
    3. How to use the exercise files
  2. 28m 14s
    1. After Effects workflow overview
      2m 18s
    2. Bringing elements into After Effects
      2m 23s
    3. Adding elements to the Timeline
      1m 57s
    4. Working with layers
      3m 45s
    5. Creating animation with presets
      3m 24s
    6. Applying effects
      3m 34s
    7. Creating animation without presets
      5m 38s
    8. Previewing your work
      2m 46s
    9. Exporting content as a movie file
      2m 29s
  3. 27m 20s
    1. Touring the interface
      6m 2s
    2. How After Effects projects work
      4m 47s
    3. What is a composition?
      4m 52s
    4. Tips for adding content to compositions
      2m 49s
    5. Understanding the properties of video
      8m 50s
  4. 57m 8s
    1. Importing an Illustrator file
      4m 57s
    2. Animation basics
      7m 12s
    3. Animating opacity
      6m 40s
    4. Understanding anchor points
      4m 57s
    5. Animating position
      6m 8s
    6. Animating rotation
      4m 41s
    7. Animating scale
      7m 19s
    8. Using the Puppet tool
      7m 13s
    9. Copying and pasting keyframes
      3m 4s
    10. Animation shortcuts
      4m 57s
  5. 9m 42s
    1. Understanding precomposing
      6m 51s
    2. Navigating through compositions quickly
      2m 51s
  6. 1h 12m
    1. A showcase of effects
      2m 34s
    2. Creating a layer for effects
      3m 1s
    3. Applying effects
      4m 54s
    4. Animating effect properties
      4m 29s
    5. Using Glow
      5m 34s
    6. Creating patterns and textures
      6m 57s
    7. Creating a fireball
      7m 9s
    8. Using the Cycore effects
      5m 58s
    9. Adding blur
      5m 45s
    10. Creating a galaxy scene from scratch
      8m 38s
    11. Distorting objects with effects
      4m 7s
    12. Creating and using lens flares
      4m 21s
    13. Creating lightning bolts
      4m 3s
    14. Viewing random variations with Brainstorm
      4m 39s
  7. 30m 52s
    1. Shortening the duration of layers
      4m 23s
    2. Trimming in the Footage panel
      4m 14s
    3. Slowing and accelerating video speed
      7m 9s
    4. Applying video transitions between clips
      6m 7s
    5. Working with image sequences
      4m 47s
    6. Importing footage with an alpha channel
      4m 12s
  8. 36m 11s
    1. Brightening dark footage
      9m 12s
    2. Changing colors in footage
      6m 34s
    3. Creating cinematic color treatments
      8m 17s
    4. Creating a quick vignette
      3m 42s
    5. Colorizing black-and-white objects
      4m 50s
    6. Using adjustment layers
      3m 36s
  9. 21m 9s
    1. Creating and editing text
      7m 39s
    2. Applying text animation presets
      4m 41s
    3. Animating text manually
      4m 43s
    4. Applying layer styles to text
      4m 6s
  10. 28m 58s
    1. Let's get better
    2. Using work areas
      3m 37s
    3. Creating markers
      6m 17s
    4. Replacing layers
      2m 35s
    5. Mastering Timeline navigation
      3m 18s
    6. Aligning and distributing layers
      3m 4s
    7. Selecting layers quickly
      1m 56s
    8. Cropping layers
      3m 43s
    9. Adjusting comp resolution
      3m 51s
  11. 23m 53s
    1. Using the paint tools
      9m 35s
    2. Using the Roto Brush tool
      9m 25s
    3. Animating growing vines
      4m 53s
  12. 40m 29s
    1. Creating and using masks
      6m 42s
    2. Exploring mask options
      7m 57s
    3. Creating masks with Auto-trace
      6m 51s
    4. Masking objects with other objects
      5m 33s
    5. Making shape layers
      3m 43s
    6. Modifying shape layers
      9m 43s
  13. 30m 44s
    1. Turning 2D layers into 3D layers
      9m 22s
    2. Creating lights and cameras
      6m 14s
    3. Creating shadows
      4m 23s
    4. Using depth of field
      4m 42s
    5. Working with 3D effects
      6m 3s
  14. 18m 10s
    1. Removing a green screen background
      4m 37s
    2. Refining the matte
      4m 48s
    3. Compositing with color adjustments
      4m 50s
    4. Compositing with blend modes
      3m 55s
  15. 25m 44s
    1. Understanding spatial interpolation
      2m 5s
    2. Creating and adjusting motion paths
      3m 55s
    3. Orienting moving objects along a path
      1m 29s
    4. Drawing motion with Motion Sketch
      2m 51s
    5. Creating pauses in animation
      3m 6s
    6. Understanding temporal interpolation
      1m 56s
    7. Easing keyframes
      5m 57s
    8. About the Graph Editor
      4m 25s
  16. 12m 13s
    1. Stabilizing shaky footage
      7m 46s
    2. Tracking the motion in footage
      4m 27s
  17. 24m 58s
    1. Setting up parent layers
      5m 49s
    2. Working with null objects
      2m 31s
    3. What are expressions?
      7m 17s
    4. Modifying simple expressions
      2m 20s
    5. Using the wiggle expression
      7m 1s
  18. 6m 52s
    1. Understanding audio in motion graphics
      1m 22s
    2. Previewing and mixing audio
      3m 55s
    3. Enhancing audio tracks with effects
      1m 35s
  19. 11m 36s
    1. Adding comps to the Render Queue
      2m 30s
    2. Exploring key Render Queue settings
      4m 11s
    3. How should I export my video?
      4m 55s
  20. 7m 16s
    1. Using Photoshop with After Effects
      2m 10s
    2. Using Illustrator with After Effects
      3m 2s
    3. Using Flash with After Effects
      2m 4s
  21. 11s
    1. Goodbye

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Slowing and accelerating video speed
Video Duration: 7m 9s 8h 39m Beginner


Slowing and accelerating video speed provides you with in-depth training on Video. Taught by Chad Perkins as part of the After Effects CS5 Essential Training

View Course Description

In After Effects CS5 Essential Training, author Chad Perkins discusses the basic tools, effects, and need-to-know techniques in Adobe After Effects CS5, the professional standard for motion graphics, compositing, and visual effects for video. The course provides an overview of the entire workflow, from import to export, as well as detailed coverage of each stage, including animating text and artwork, adding effects to compositions, working in 3D, and rendering and compressing footage. Exercise files are included with the course.

Topics include:
  • Understanding the After Effects workflow
  • Precomposing footage
  • Explaining the basics and beyond of animating
  • Creating glows, patterns, textures, and more with effects
  • Color correcting footage
  • Working with text
  • Manipulating video playback speed
  • Masking objects and shape layers
  • Removing backgrounds with keying
  • Compositing multiple pieces of footage
  • Integrating After Effects with the rest of the Creative Suite
After Effects

Slowing and accelerating video speed

One of things that we After Effects users do on quite a regular basis is to play around with the speed of clips. We slow them down, or speed them up. So, I want to show you a little bit about how to do that here. We have two different clips that we're going to be looking at. The first one is this dancing girl clip. This is actually my little daughter Natalie. And the footage is blurry, but still adorable nonetheless. And she is dancing around here, having a good time to Frosty the Snowman. And so what I am going to do is go over here to the column in the Timeline panel, maybe next where it says, Parent, or one of mode switches areas, whatever.

Right-click on this bar, and then go to Columns. These are different columns that we can access here, just like Parent is a Column, and layer Name is a Column. We'll go to Columns, and choose Stretch. This allows us to control the stretch of the clip. So, if we took this down, it stretches to maybe only, like 50% of the clip. Then it's basically making this 50% of the duration. So, by making it 50% of the duration, it has to speed it up. So, if we now hit the Spacebar to preview this, we can see, and actually, it's kind of loading in to RAM, so it's not previewing in real-time.

I'll just go ahead and stop that, hit the Home key to backup, and now play this back. And there we go. It's going twice the speed. Now, but opposite is also true. We can click and drag this to the right and take this all the way up above even 100%, let's say 200% for right now. And that will make this clip twice as long. So, as we play this now, we have this very beautiful slow motion rendition of my little girl dancing. So, I'm going to go ahead and render this, and we'll see what it looks like.

Now, you'll notice how fast that rendered, very, very quickly. And you'll also notice that this is a little bit jagged. Here is why. Let me actually just play that back for you, 0 on the numeric keypad is the RAM Preview. See it's going in slow motion there. Very, very pretty. But again, you'll notice that with the RAM previews, the green bar here, that it's really staggered. Now, what's going on here when you stretch something, if I hit Page Down to go from frame-to -frame, you'll see that we have a new frame, and I hit Page Down again. I go to a duplicate frame, and then I go to a new frame.

And then the next frame is just a copy, and the next frame is a new frame. So, really what it's done, in order to stretch it to 200%, is it has duplicated every frame twice. Now this looks pretty, but it's a very like circa 1990s slow-motion, because it's a little choppy. It's not completely smooth. Again, it's copying every single frame. It's still a cute effect, but there is a better way to do this here. I am going to take that stretch, and I am just going to click in this field and click 100 in the Stretch Factor field here and click OK.

I'll take it back to our original speed. I am going to apply the Timewarp effect. And the Timewarp effect is a more intelligent way to play with time. And because it's a more intelligent way to play with time, it takes a lot longer to render. When I am talk about lot longer to render, I mean a lot longer to render. So, be aware of that. By default, the Speed value here is set to 50, which means 50% of the speed, so the numbers are kind of backwards. With the Stretch column, when we take something to 50, it means we're speeding it up, because it's only half of the duration.

But in the Timewarp effect, speed refers to the actual speed. So, 50 will actually slow it down, cut the speed in half, and 200 would be making it twice as fast. So, we're going to hit the Home key and back up here. I am going to do a RAM Preview of this. But because it take so long, we're just going to go ahead and edit this out, so you could see the final result. So, with that long render, this is what we have. So, it's just more smooth, and more fluid. If we're going to pause this here, After Effects is intelligently figuring out what comes in between the new frames.

So, if we hit Page Down, we could see that After Effects is actually synthetically creating every other frame. It's really amazing, and it creates a very, very smooth slow-motion effect. Now this is no replacement for in- camera slow motion, like when you over crank footage on your video camera. You record at a faster frame rate, so that when you bring it into the main Timeline in your system here, it's actual true slow motion. That's the best. But in a pinch, if you cannot get that, then this works quite well.

Of course, slow-motion stuff is always fantastic. If we go to the Project panel, there is this clip of me doing a little improv sappy piano. And if we play this back with the piano, it's kind of a touching effect. (Piano playing) Pretty fun. Let's go over to the Clip05, the snowboarding clip we have seen before.

Now this clip is actually already in slow motion a little bit. Again, this is the in-camera slow motion I was talking about, that when they filmed it they filmed it in slow motion. And it looks pretty good here. In this case, what I would do is I would just avoid the Timewarp effect completely, unless you were going to slow it down even more, which you could do. If you go to the Columns area, we'll go to Stretch, and we stretch this, I don't know, to maybe 50% or so. And then as you preview this back, it renders very quickly - in contrast to what we just saw with Timewarp. And it appears to almost bring this back into full speed, which is very interesting.

So, I'll preview this back and look how fastly that rendered, and I did just say fastly. Go ahead and apply the Timewarp effect to this clip. I want to show you something else. If we go back to the dancing girl, sometimes you will have occasional artifacts. There isn't artifact right there. They are just kind of like this little like thing that flies off like a little tentacle, or something that's not there in the frame before, or in the frame after, but in the process of synthetically creating these frames, sometimes After Effects will do really weird things.

There is another thing too. That's not really what her hand was doing in the clip, but that's just what happens with Timewarp. For whatever reason, this exact clip of my daughter dancing here, this is probably the worst case I've seen of it. It usually doesn't artifact that much. But just to show you that it can actually work very well, I apply the Timewarp effect. We'll take Stretch back to 100%, and then with the Speed value at 50%, we know that After Effects is actually creating every other frame from scratch. So, it's slowing down the slow-motion, and it's still just looks fantastic, every frame, after frame, after frame, even in an action shot like this, it's still just looks fantastic.

So, again, just to sum up, if you're looking for quick rendering, you stretch in the Timeline Panel. If you have the render time, and you're looking for a little bit more quality, then go ahead and use the Timewarp effect, But unless you know exactly what you're doing, and you've mastered the Timewarp effect, typically only use the Timewarp effect to slow down footage. You typically want to speed up footage still using the Stretch panel here.

Find answers to the most frequently asked questions about After Effects CS5 Essential Training .

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Q: In the "Creating a fireball" movie in Chapter 6, the author showed how to make a fireball. Unfortunately, it all centered around a blob layer that he made without showing how to make a blob layer. How does one go about creating a blob layer like the one used in the video?
A: To create a blob layer, make a shape layer using the Pen tool. Animate the anchor points over time to make it move. These concepts are reviewed in depth in Chapter 4, "Learning to Animate."
Q: In the Chapter 5 video "Understanding precomposing," the exercise file provided does not seem to match up with the file the instructor uses. My file does not include a "Biker Body" layer. Is there an error in the exercise file?
A: Unfortunately, the exercise file originally distributed for this chapter was incorrect. A new file was issued in February 2011. If you downloaded the exercise files prior to then, you can download the corrected file on the Exercise Files tab of the course page.
Q: How do I transition from one piece of animated type to another in After Effects?
A: There isn't an effect that can create these types of transitions. It's really a matter of animating the type and camera, using basic keyframing and positioning.
If you understand the basics of moving the anchor point of a type layer, animating the parameters of that layer (Scale, Rotation, Position, etc.) and then separately animating the camera around the type layers, you can achieve different types of transitions.  Check out the following videos for more information:






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