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Retiming with Time Remapping

From: After Effects CC Essential Training

Video: Retiming with Time Remapping

Time-remapping is the process used in video to slow down or speed up time. And like many tools in After Effects, there are many different ways to remap time. For this video, I'm going to show you what I think is the most visual way to not only apply time-remapping, but to understand how it works. I want you to start off by double clicking the stairs high speed comp and then loading up a RAM preview. Just understanding the Preview panel for this video, I'm going to have from current time selected. That way I can jump around to different frames and load up a preview and it won't start back at the beginning of the comp.

Retiming with Time Remapping

Time-remapping is the process used in video to slow down or speed up time. And like many tools in After Effects, there are many different ways to remap time. For this video, I'm going to show you what I think is the most visual way to not only apply time-remapping, but to understand how it works. I want you to start off by double clicking the stairs high speed comp and then loading up a RAM preview. Just understanding the Preview panel for this video, I'm going to have from current time selected. That way I can jump around to different frames and load up a preview and it won't start back at the beginning of the comp.

Let's load up a RAM preview of a couple frames in this specific composition. After a few seconds have loaded, go ahead and press the Spacebar to begin playback. Now if you look in the Info panel, you can see that it's playing back in real time. But if you look in the Composition panel, it looks like our athlete's running in slow motion. I'm going to stop playback here for a second. The reason it looks like that is because, in essence, that's what was happening. We use the high speed camera to shoot this footage. So it shoots more than the average number of frames per second. Anytime you think you're going to need a slowed down footage Or do some heavy time-remapping.

You want to go ahead and try and shoot that footage with a high speed camera. Even if it just shoots double the number of frames, say 60 frames per second, that will still give you more frames to work with when it comes to slowing down the project. To better understand what I mean, you should think of it this way. If I had a dslr camera that shot 60 frames a second, and then I imported that footage into afterthoughts and told after effects, no it really was shot at 30 frames a second. What after effects is going to do is play it back at half the speed.

So in essence, you've already got slowed down footage. When you're re-mapping time, very rarely is it a problem to speed up your footage. The problem usually occurs when you try and slow it down. Let's double click on the board part composition here in the top of our Project panel. Now, let's load up a RAM preview here. You can see we've got some Go Pro footage that my friend Carl shot of Emily going through the snowboard park. Now as you can tell, it's handheld. But, even though it's a little shaky, it's still high enough quality for us to deal with here in after effects. So I'm going to press Spacebar to stop playback for a second. Now it just so happened that I stopped on the right frame, but I would like to add a freeze frame here.

So I'll have my friend Emily here in the snowboard come up and then pause for a second at three fifteen and then after the freeze frame we'll have a go ahead and snowboard through the rest of the scene. So lets move our current time indicator to frame three fifteen. To enable time-remapping, select layer 1 and go up under the Layer menu and go to Time > Enable Time Remapping. Two keyframes are automatically added at the start and end of your project. Now, if you want to add a key frame at a specific point in time, go ahead and position your current time indicator there.

And then click the diamond key frame button in between your key frame navigator buttons on the left end of your time line. Now that we've added a key frame in the middle of the timeline, let's open the Graph Editor by using a little known key command Shift+F3. This will toggle the Graph Editor on and off. Now, if we're looking at the Graph Editor, you can see we have a solid line, and now it's because it defaults to the speed graph. Now, it's going to play back at one second per second, because we haven't really remapped any time.

I want you to go to the second button from the left, and click on it, and change to the value graph. So go to edit value graph. Notice the angle of this line here is telling me that this footage is playing back in real time. If I click and drag down on the footage, the footage on the left is going to play back slower than real time. And the footage on the right is going to play back much more quickly. So, if I move my current time indicator to around, two seconds or a little before. I can let up a RAM preview and press the Spacebar here, and you can see, in the slow frames, it looks rather jittery. Now, its doing this because the footage was shot at 2997 frames a second, but, if you slow it down, much slower than that 29.97. It has to basically stretch out the length of each frame. There aren't enough frames to blend them together to give us a nice slow motion effect, so I'm going to press the Spacebar and stop playback and press Cmd+Z on the Mac, Ctrl+Z on Windows to undo.

Now, what if I want to add that freeze frame and then have her ride off through the rest of the park? I can quickly and easily do that by getting out of the Graph Editor and making sure I have the last two keyframes selected. I'm going to click and draw a lasso around both, and then click and drag on one of them. Now, as I drag out to the right, let's drag it to around 4:15, and I can see what frame because it's in the Info panel there. I'm just going to draw a lasso around this frame one more time. Because that'll deselect both key frames. And just select that one key frame.

Now I can press Cmd+C to copy and Cmd+V to paste. Same thing with Windows, it's just Control instead of Command. Now if I go back to around two seconds and load up the ramp preview, you can see my footage actually goes up. And pauses and then continues on through the rest of the ride. It's doing something funny right now and that's just because it's not playing back in real time. You should always double check the Info panel, if you think something's not playing back the right way. In this example, we've frozen our footage. Now we could easily add a slow down just before that freeze frame by going back into my Graph Editor and that's what we'll do.

I'm going to press the Spacebar to stop playback and open the Graph Editor and here I'll draw a lasso just around that first freeze key frame and then let's click the easy ease in button, the second one from the right on the bottom. When I click that, I'll get this pull out handle. Now if I load up a RAM preview starting at two seconds, you'll see, it kind of slows down a couple of frames before it stops. And thats because, again, it slowing down to such a slow frame rate, it doesn't have enough to keep playing back.

So, i just going to press the Spacebar to stop playback, and what you need to do is just click and drag on the handle and hold down shift after begin to drag. Let's shorten that slow-down significantly. Now if we load up a RAM preview, you can see that the board comes up and then pauses and then continues on. That did a pretty good job. Now, on occasion, you'll have instances where this still isn't quite good enough. If you press the Spacebar to pause playback here, I want to go ahead and go up under the layer menu and show you another setting.

It's called frame blending. Now a new slowdown footage, After Effects has a couple different ways that it can try and make up the frames in between, and that's frame blending. So if you've got footage that's really jittery and you need it to actually not be quite so jittery go to your frame blending and choose at least frame mix. Pixel notion's going to give you the highest quality frame blending. But sometimes it doesn't work so well with footage that has a decent amount of motion blur in it. Now if you're unfamiliar with motion blur, I'm going to go ahead and double click this kick comp. The kick comp has footage that we shot with a high speed camera but as we scrub through, you'll see there's a lot of motion blur on her foot because she was moving very quickly, and the camera was moving very quickly. See the motion blur on the ball before the ball ever moved. I would never want to use frame blending with pixel motion on this layer. If I needed to use frame blending for this layer, I would select the layer and go up under Layer, go to Frame Blending, and choose Frame Mix. At least that way you'll have a better chance at a successful blending of frames. So when you think about time remapping the devil is in the details. If you think you want to slow something down try to rent a high speed camera that shoots a high number of frames a second, even if it's a dslr camera that can shoot 60 frames a second.

The more number of frames your camera can shoot a second the better your slow motion footage is going to look because you'll have more frames to work with. Now, if your footage wasn't high speed, and you still have to slow down the footage, remember, you can always go up to the layer menu and adjust the frame blending. Just remember, pixel motion's going to give you the highest quality, but it's going to take the longest to render. And frame mix may be slightly lower quality, but it'll be faster to work with. And using frame mix, will generally give you a better result on footage that has a lot of motion blur.

Show transcript

This video is part of

Image for After Effects CC Essential Training
After Effects CC Essential Training

135 video lessons · 59738 viewers

Ian Robinson
Author

 
Expand all | Collapse all
  1. 1m 8s
    1. What is After Effects?
      1m 8s
  2. 1h 5m
    1. Welcome
      1m 11s
    2. Using the exercise files (CC 2014.1) NEW
      1m 57s
    3. Using the exercise files
      1m 19s
    4. Understanding and managing applications with Creative Cloud (CC 2014.1) NEW
      2m 32s
    5. Which versions of After Effects CC does this course cover? (CC 2014.1) NEW
      1m 40s
    6. Relinking missing footage
      1m 54s
    7. Working with keyboard shortcuts
      1m 23s
    8. Different ways to use After Effects
      59s
    9. Exploring the interface of After Effects (CC 2014.1) NEW
      13m 22s
    10. Exploring the interface of After Effects
      12m 0s
    11. Exploring important preferences, and setting up the cache (CC 2014.1) NEW
      8m 44s
    12. Exploring important preferences and setting up the cache
      6m 20s
    13. Video terminology (CC 2014.1) NEW
      6m 19s
    14. Video terminology
      4m 24s
    15. Updating After Effects with Creative Cloud
      1m 25s
  3. 1h 0m
    1. The six foundations of After Effects
      11m 5s
    2. Understanding compositions
      10m 35s
    3. Creating and manipulating layers
      9m 49s
    4. Building animation
      6m 29s
    5. Working with effects
      7m 5s
    6. Introduction to 3D
      8m 45s
    7. Understanding how to render
      6m 48s
  4. 38m 54s
    1. Importing elements
      5m 53s
    2. Organizing projects
      3m 51s
    3. Building compositions with layers
      6m 17s
    4. Animating with keyframes
      10m 0s
    5. Adding effects and graphics
      8m 7s
    6. Output techniques
      4m 46s
  5. 44m 49s
    1. Exploring composition and project settings
      6m 48s
    2. Importing Photoshop files as compositions
      8m 39s
    3. Importing Illustrator files as compositions
      7m 41s
    4. Viewing files in the comp panel
      4m 42s
    5. Understanding Pre-compose
      4m 21s
    6. Positioning layers with snapping
      4m 55s
    7. Interpreting footage
      4m 0s
    8. Keyboard shortcuts for compositions
      3m 43s
  6. 1h 5m
    1. Defining layers
      5m 4s
    2. Creating type layers
      7m 38s
    3. Precise typesetting techniques
      5m 42s
    4. Creating layer solids and shapes with masks
      9m 6s
    5. Creating design elements with shape layers
      6m 10s
    6. Layer compositing: Masks, switches, and blend modes
      7m 35s
    7. Using track mattes
      4m 49s
    8. Precise compositing with variable-width feathered masks
      9m 24s
    9. Working smarter by swapping layers
      7m 6s
    10. Keyboard shortcuts for layers
      2m 35s
  7. 1h 35m
    1. Understanding animation
      6m 20s
    2. Adding and adjusting keyframes
      9m 52s
    3. Understanding keyframe interpolation (CC 2014.1) NEW
      8m 52s
    4. Understanding keyframe interpolation
      6m 20s
    5. Adjusting keyframes in the Graph Editor
      8m 26s
    6. The power of parenting
      5m 26s
    7. Using null objects
      6m 46s
    8. Creating expressions with the pick whip
      6m 25s
    9. Creating and adjusting motion paths
      9m 56s
    10. Building complex graphics with Pre-compose
      4m 54s
    11. Preparing audio for animation
      8m 57s
    12. Generating graphics with audio
      9m 13s
    13. Working smarter: Navigating the Timeline
      4m 32s
  8. 58m 59s
    1. Understanding the order of effects
      5m 58s
    2. Generating backgrounds with effects
      5m 33s
    3. Generating a scribble effect
      8m 12s
    4. Animating strokes with effects
      6m 37s
    5. Using adjustment layers
      5m 52s
    6. Adding gradients and glows
      4m 30s
    7. Saving pan and scan presets
      5m 20s
    8. Fixing exposure with Levels
      3m 5s
    9. Fixing color casts with Color Finesse 3
      9m 57s
    10. Masking individual effects
      3m 55s
  9. 1h 17m
    1. Understanding 3D in After Effects
      9m 2s
    2. Intro to cameras (CC 2014.1) NEW
      10m 50s
    3. Intro to cameras
      7m 51s
    4. Intro to lights and material options
      8m 56s
    5. Animating cameras (CC 2014.1) NEW
      11m 11s
    6. Animating cameras
      12m 39s
    7. Creating depth of field
      6m 48s
    8. Exploring the ray-traced 3D renderer
      10m 8s
  10. 3h 40m
    1. Understanding CINEMA 4D Lite and After Effects (CC 2014.1) NEW
      1m 53s
    2. Understanding CINEMA 4D Lite and After Effects
      1m 32s
    3. 3D foundations (CC 2014.1) NEW
      9m 49s
    4. 3D foundations
      10m 43s
    5. Matching CINEMA 4D Lite and After Effects projects (CC 2014.1) NEW
      7m 14s
    6. Matching CINEMA 4D Lite and After Effects projects
      8m 9s
    7. Understanding the CINEMA 4D Lite interface (CC 2014.1) NEW
      9m 49s
    8. Understanding the CINEMA 4D Lite interface
      7m 31s
    9. Creating 3D projects from Illustrator files (CC 2014.1) NEW
      7m 20s
    10. Creating 3D projects from Illustrator files
      7m 28s
    11. Exploring modeling in CINEMA 4D Lite (CC 2014.1) NEW
      11m 7s
    12. Exploring modeling in CINEMA 4D Lite
      8m 8s
    13. Applying deformers (CC 2014.1) NEW
      4m 50s
    14. Applying deformers
      5m 59s
    15. Understanding materials (CC 2014.1) NEW
      10m 29s
    16. Understanding materials
      7m 32s
    17. Lighting your scene (CC 2014.1) NEW
      11m 20s
    18. Lighting your scene
      8m 14s
    19. Looking at detailed materials
      7m 51s
    20. Working with presets (materials and lights) (CC 2014.1) NEW
      7m 44s
    21. Animating in CINEMA 4D Lite (CC 2014.1) NEW
      5m 52s
    22. Animating in CINEMA 4D Lite
      6m 51s
    23. Adjusting keyframes in CINEMA 4D Lite (CC 2014.1) NEW
      7m 42s
    24. Animating cameras in CINEMA 4D Lite (CC 2014.1) NEW
      5m 49s
    25. Animating cameras in CINEMA 4D Lite
      5m 45s
    26. Working with CINEWARE (CC 2014.1) NEW
      8m 11s
    27. Working with CINEWARE
      9m 38s
    28. Render settings and the multipass workflow (CC 2014.1) NEW
      7m 28s
    29. Render settings and the multipass workflow
      8m 38s
  11. 23m 35s
    1. Rendering with Adobe Media Encoder
      4m 45s
    2. Recommended settings for rendering graphics
      10m 21s
    3. Creating presets in the Render Queue
      4m 0s
    4. Prerendering with Import and Replace Usage
      3m 18s
    5. Working smarter: One render, multiple outputs
      1m 11s
  12. 36m 53s
    1. Creating type animators
      8m 52s
    2. Creating and animating type on a path
      5m 32s
    3. Animating shape layers
      8m 45s
    4. Animating brushstrokes with Paint
      5m 54s
    5. Animating text and prepairing templates for use in Premiere Pro (CC 2014.1) NEW
      7m 50s
  13. 23m 31s
    1. Retiming with Time Remapping
      8m 56s
    2. Retiming footage with Timewarp
      9m 10s
    3. Smoothing shaky camera footage with Warp Stabilizer VFX
      5m 25s
  14. 16m 6s
    1. Getting started with Keylight
      8m 43s
    2. Refining your key with Keylight
      3m 42s
    3. Cleaning up keys with masks
      3m 41s
  15. 26m 47s
    1. Rotoscoping with paths
      6m 47s
    2. Introducing the Roto Brush
      5m 58s
    3. Refining the Roto Brush
      6m 12s
    4. Using the Refine Edge tool
      7m 50s
  16. 27m 13s
    1. Creating a single point track
      7m 38s
    2. Applying motion with Warp Stabilizer VFX
      4m 29s
    3. Warp Stabilizer VFX: Reversible Stabilization workflow
      7m 47s
    4. Solving cameras
      7m 19s
  17. 6m 30s
    1. Archiving your projects
      3m 50s
    2. Removing unused footage
      1m 25s
    3. Moving compositions between projects in After Effects
      1m 15s
  18. 2m 24s
    1. What's next?
      2m 24s

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