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The Motion Timeline is where you can trim, slide and edit the elements in your project. As we go through this course, you might notice how rarely you'll have to use the full view of the Timeline. I think that speaks to just how well the interface and mini Timeline is designed. So let's get started opening the Timeline, press F6 with your keyboard, or click on the button in your toolbar to open the Timing pane. You'll notice you have the plus and the minus button just like the Project pane. Let's press F5 to open the Project pane and you'll notice you have true parity between the layers and groups, in the Layers tab as well as the layers and groups in the Timeline.
Also with the Timeline open, you'll notice you can change where the playhead is just by clicking-and-dragging in this Value slider, just like the Play Value slider at the bottom of your canvas. The disclosure triangle lets you know that there are layers within the groups. And the disclosure triangles on the individual layers lets you know the things like behaviors or filters have been applied to that specific layer. You can retime layers in the Timeline just by clicking on them and dragging. Notice you get a contextual menu that pops up letting you know where the in point, and the out point is as well as how many frames you have dragged that specific object.
You can retime the entire group just by clicking-and-dragging on the group as well. Notice that moves all the layers within the group. Now, if you would like to trim something in your Timeline, you can just click-and-drag on the left-hand side. Notice as I'm clicking-and-dragging on the entire group, it's trimming the subsequent layers. Now the key commands are pretty easy to remember. Let me move the playhead a little further down the Timeline. If we would like to trim this entire group, go ahead and select it and press i on your keyboard.
That will trim the in point. Notice now those objects will not be visible even though we can see them here in the timeline. This is actually controlling the overarching groups visibility. If you would like to trim an individual layer the same key command works, select the layer, move your playhead and press i. Now you notice when I move my playhead, the text for Index is now disappeared. To trim the out points you can use the same click-and-drag technique, or you can press O on your keyboard.
Let me scroll down in the Timeline here a little bit. So we can retime Video_Button 4. Instead of trimming with the key command let's actually slide this whole group with the key command. If you hold down Shift and press the Left Bracket key which is just underneath your minus key towards the top of your keyboard, that will slide the entire layer. Notice as I scrub my playhead in my Timeline, the animation and everything else has still remained intact. It just won't start until later in the Timeline.
That's the difference between a trim and a slide. When you slide something all the animation remains the same; when you trim it you are literally cutting off that section of whatever it is you are trimming. Now that we have covered controlling items in the Timeline, let's look at these buttons down here. These will turn on and off the visibility of the different elements applied to each individual objects. For example, you can turn on and off the visibility of keyframes, behaviors, filters, etcetera.
These four buttons right here will allow you to change the size of the layers and groups in the Timeline. This slider here will allow you to zoom in on specific section, so you can more easily perform precise edits. This bar at the bottom, if you click- and-drag, will allow you to reposition exactly where you are in viewing that section of the Timeline. Same thing with the scrollbar on the right side it just does so vertically. This magnifying glass on the right side if you double-click will reset the Zoom view for the Timeline.
And oh yeah, there is one more thing, sometimes you'll have to move the playhead to the beginning or the end of a layer. The easiest way to do that is to scrub with the playhead in the Timeline, hold down Shift as you scrub and you'll notice the Timeline will snap to those specific layers. Now with a layer selected, if you hold down Shift and press i your playhead will jump to the in point of that layer. If you hold down Shift and press O, it will jump to the out point. Let's go ahead and conclude this tour of the Timeline by press Command+7 on our keyboard to close the Timeline.
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