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Understanding timewarp effects

From: Avid Media Composer 5 Getting Started

Video: Understanding timewarp effects

Unlike motion effects, timewarps are not clips that we originate and store in the bin; instead, they are effects which we drop onto clips already in the Timeline. Rather than creating a new version of a clip at are specified new frame rate, timewarps allow us to adjust the speed of a clip dynamically over time. Timewarps can be found in the Effects palette. If I scroll down, I have got a Timewarp category. Inside the time Timewarp category, there are numerous pre-built template effects.

Understanding timewarp effects

Unlike motion effects, timewarps are not clips that we originate and store in the bin; instead, they are effects which we drop onto clips already in the Timeline. Rather than creating a new version of a clip at are specified new frame rate, timewarps allow us to adjust the speed of a clip dynamically over time. Timewarps can be found in the Effects palette. If I scroll down, I have got a Timewarp category. Inside the time Timewarp category, there are numerous pre-built template effects.

For example, here is the Speed Bump effect. Down here in the Timeline, let me play back the boardwalk clip. (Clip playing.) Currently playing back at normal speed, but if I take the Speed Bump effect, drag it and drop it onto the clip here, now as I play it back, you should see it slows down towards the middle of the clip and then speed back up towards the end. (Clip playing.) Like so. And because of the green dot here, it's a real-time effect.

In fact, the only one that isn't real- time is the Reverse Motion effect here. So these are templates. The last two at the bottom here in the category are not templates. They are blank effects that we are going to customize. Let's look at this clip here, called cafe. (Clip playing.) There is a black gap between cafe and the downtown clip. If I want to bridge that gap, now suppose I could just go to Trim mode and trim it out.

But now, I have got a red bracket in the bottom right-hand corner of my left-hand viewer, indicating that there are no more handles available for this clip. If I wanted to make this clip last until the next clip, what I could do is use Trim to Fill. Drag and drop Trim to Fill on, and now the clip will dynamically adjust its playback rate to allow it to last the duration of the trim. See, it's changed to 63%, and now when I play back... (Clip playing.) a slight adjustment to the speed to allow that clip to make up the rest of the gap in the Timeline there.

That's using Trim to Fill. What about timewarp itself? I have got a clip of the bike path. (Clip playing.) Let's take the timewarp effect, drag it and drop it onto bike path clip. Now, at the moment, (Clip playing.) you can see there is no change to the speed of the clip. That's because there's no template. This is a blank effect that we need to customize. Okay, so how do we do that? Down here in the Timeline palette, there is the Motion Effect Editor button.

If I click on that, it takes me in to the Motion Effect Editor. Here we have got the ability to open up two different graphs: Speed and Position. Now, because I am going to be editing Speed, I don't really need the Postion graph open at the moment, so I am going to close that back up to give us a little bit more room on our desktop. You can see here that I've got a Scrub bar. I can scrub it backwards and forwards across the length of the clip. I have also got a keyframe. If I grab hold of the keyframe and drag it down to 50%, now I have changed the speed of that clip to 50%.

Let's play it back in the Timeline. (Clip playing.) Okay, so that's great, but what if I want to customize it even more? Well, no problem. I can come along here, and I can pre-stage keyframes by using the Add keyframe button. So may be I am going to add one here, move along a little way, add another one here, move along a little ways, and then add another one here.

Now I can grab hold of the middle one and push it up. You can see the speed updating there in the top left corner, as I move the keyframe up and down. This is the Speed scale along the left-hand side here. You can see it goes into negative values there. And this is the Time value along the bottom. If I want to zoom in or zoom out, I have got a scale bar that allows me to resize the window itself and zoom in along the Speed axis.

Let's see how that plays back. (Clip playing.) So you can see, this time we started off with 50% speed. We sped up, and then we went back to 50% speed again. Well, maybe I would like it to return it to normal speed after the speed increase. So I am going to grab the keyframe, move it up to here. Now I am back at 100%. Let's play it back. That's actually a Play Loop button right here in the Motion Effect Editor.

(Clip playing.) Great! Click it again to stop playback. That looks pretty good to me. Just like any other effect, if I like this and I want to save the customized version, click down, drag to the bin, and now I have got that saved for future use. Close the Motion Effect Editor, and we are back to regular Source Record Editing mode.

If we look down here in the Timeline, we can see that the two timewarps we have added have a double dash on them, two black marks. And yet here in the Timeline, there's an effect with a single dash on it. The ones with the double dash indicate Timewarp effect. The ones with the single dash indicate that they are Motion Effects instead. If I park on Motion Effect, and I go to the Motion Effect Editor, I am given the opportunity to promote my Motion effect to a timewarp.

Remember, a Motion effect will affect the clip at a constant frame rate. If I want to dynamically vary it, I should go ahead and promote this effect, and now I get the ability to keyframe changes over time again. Let's make a couple of changes, add another keyframe, and then another keyframe, like so. Close out of that, and now I have promoted my skater's clip to a Timewarp effect that dynamically changes over time.

(Clip playing.) Sometimes we simply want to make a shot last a little bit longer; other times we want to create a speed ramp for impact. Media Composer provides a combination of powerful tools for affecting the playback speed and clip length.

Show transcript

This video is part of

Image for Avid Media Composer 5 Getting Started
Avid Media Composer 5 Getting Started

36 video lessons · 6036 viewers

Steve Holyhead
Author

 
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  1. 4m 13s
    1. Welcome
      1m 31s
    2. Using the exercise files
      2m 42s
  2. 21m 40s
    1. Starting Media Composer and creating a new project
      4m 15s
    2. Understanding Media Composer
      5m 47s
    3. Working with clips, bins, folders, and the Project window
      3m 44s
    4. Saving and backing up your work
      4m 16s
    5. Retrieving a project from the Attic
      3m 38s
  3. 27m 58s
    1. Understanding media formats and the Format tab
      8m 25s
    2. Importing media
      6m 11s
    3. Linking to media using AMA
      5m 43s
    4. Accessing media from other projects
      2m 56s
    5. Working with clips in the bin
      4m 43s
  4. 23m 49s
    1. Getting started with editing
      7m 25s
    2. Creating a new sequence
      5m 39s
    3. Removing material from your sequence
      6m 20s
    4. Editing segments in the Timeline
      4m 25s
  5. 30m 44s
    1. Using Splice, Overwrite, and three-point editing
      5m 25s
    2. Understanding trim concepts
      4m 39s
    3. Working with trim techniques
      6m 6s
    4. Using the Timeline
      7m 49s
    5. Building multitrack sequences
      6m 45s
  6. 14m 21s
    1. Adjusting audio levels and pan
      6m 42s
    2. Diving deeper into audio
      7m 39s
  7. 23m 8s
    1. Setting quick transitions
      5m 33s
    2. Working in the Effects palette
      3m 42s
    3. Keyframing effects
      7m 1s
    4. Setting system performance and rendering effects
      6m 52s
  8. 17m 37s
    1. Creating freeze-frames and motion clips
      4m 40s
    2. Understanding timewarp effects
      7m 15s
    3. Understanding Timeline compositing
      5m 42s
  9. 19m 44s
    1. Working with basic color correction
      7m 13s
    2. Stabilizing shaky footage
      1m 44s
    3. Creating a basic title
      5m 0s
    4. Mixing down video and audio
      5m 47s
  10. 6m 33s
    1. Building the final output
      6m 33s
  11. 18s
    1. Goodbye
      18s

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