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Hello, and welcome back  to the seventh video 

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in our after effects series. 

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Today we're going to learn  how to motion track our video

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and link our text 

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to that tracking position. 

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So going back on  what we've learned so far,  I'm just going to hit 

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the transparency grid 

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to ensure that this typography text

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composition has a alpha background,

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which it does have, then 

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I'm going to go back to my bin

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and just drag in our footage 

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and place it underneath  our typography layer. 

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I'm going to click on my type 

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and just hit U to get rid of all the key

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frames and properties, I'm 

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going to click on the audio 

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to make sure there's 

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no audio on my video track 

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and then I'm going to solo my video track

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so nothing else is above it 

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and nothing is distracting.

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So now let's start our motion tracking

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on the right hand side, 

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where our effects and presets 

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are, we'll just close that off by clicking it 

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you'll find a tracker. 

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Now we have track  camera, warp stabilizer,  track motion or stabilize motion. 

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And what we're trying to do in  this case is track 

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the motion in our frame, 

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then link the text to that motion.

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And if we just scrub 

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through our timeline, 

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I can see that

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the neck of the guitar here

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is a nice sort of fluid 

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up and down movement. 

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It's not too aggressive. 

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There's not too much motion blur there.

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Unlike his fingers here, 

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which go up and down 

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the neck of the guitar, 

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too much motion blur there 

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I feel for after effects of pick that up

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and it goes slightly out of focus.

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So what I'm going to do 

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is I'm going to use this point 

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of the guitar just up here,

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for after effects, to try to track 

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just ensuring it  stays in the frame at all times, 

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which it does just until the end 

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where it disappears, which should be OK. 

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So in order for us to do this,

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we need to click on the layer

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that we require, I'm 

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just going to turn off my title

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and action safe guides there. 

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So we need to go over here,

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and it's a click track emotion 

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and you'll find out what happens here

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is it takes us away from our composition

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onto the layer itself which is C0017.

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Now, as always, 

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we should rename this layer 

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so I'll just go ahead and do that 

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once again and call that guitar.

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So I need to pick my point, 

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which I went after effects the track. 

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Ensuring I have my selection tool, 

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or V on the keyboard selected,

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I'm just going to zoom in using

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the scroll wheel on my mouse

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and move this election point 

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over to the part of the guitar

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which I want it to track.

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It was actually the next 

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next one along here. 

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What these two boxes 

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represent is the inside box is

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what aftereffects is going to track

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and the outside box 

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as what after effects will reference

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to find that tracking point.

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So let's just see

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and go ahead, see if this works.

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Zooming back out, fit, 

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we have a couple of options here 

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to track the motion. 

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We have analyze one 

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frame backwards, analyze backwards, 

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analyze forwards and analyze 

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one frame forwards. 

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I'm going to go ahead and analyze 

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the entire eight seconds of our clip. 

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And let's see what happens. 

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I will speed this up 

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so you're not waiting for my computer 

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to go through this and generate 

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all the key frames for us.

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So as we can see here, 

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it tracks it quite well 

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until about this point where it goes off

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tracking it fine all the way through here

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and then it goes off again 

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just there,  so we can actually fix this ourselves. 

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We can hit U on our keyboard. 

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And these are all the key frames 

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after effects has determined 

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by trying to track it. 

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So let's zoom in by holding Alt 

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and scrolling on our mouse wheel,

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take a closer look on which frame

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it didn't like, which  it was this one here 

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so I can simply click on my box

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I can track it back 

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to the point I want it to track. 

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Excellent stuff. 

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So again I'll zoom out on our time line 

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ALT and mouse scroll 

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wheel, we'll just go through it

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and we have a good 

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five and a half seconds. 

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So we could go through 

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and fix the end of this track 

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but I don't need to do that myself, 

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so what we need to do 

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now is we need to link 

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all of these key frame properties 

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to something within our composition. 

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And the way we do it is we create 

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something called a null object,

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a null object is essentially a layer

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which you can pin things to 

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and then you can parent something else 

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to that null object 

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to take on that property.

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So I'm going to go up 

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to the top of our window here. 

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Go to layer, new, null object.

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And there we go that's been created.

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In our tracker 

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we need to edit our target now.

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So it's not our video layer,

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but actually our null object 

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that it applies the key frames to.

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So let's change our layer 

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to the null object. 

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OK, so now if we apply that

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You can apply X and Y dimensions.

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Now we're back in our composition

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and you can see our null object

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has all of the key frames attached to it.

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So I'm just going to trim our null object

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when the track doesn't  stick to the right part of the video

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by clicking ALT and close bracket.

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Going to un solo those two.

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I'm going to link our typography

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layer to our null object

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by using the pick whip.

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So now we can see

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our typography layer follows

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the motion of the guitar itself.

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In the next video

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will look at more advanced

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masking techniques as well 

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as bringing in other assets.