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  • Overview
  • Transcript

3.1 Reducing 'Jello' Effects in Post

We will examine some various methods for reducing 'jello' effects on aerial footage using Warp Stabilizer in Adobe After Effects.

1.Introduction
1 lesson, 01:28

1.1
Introduction
01:28

2.Preparation
2 lessons, 10:13

2.1
Camera Settings
05:49

2.2
UAV Preparations
04:24

3.Optical Fixes
2 lessons, 13:45

3.1
Reducing 'Jello' Effects in Post
08:28

3.2
Lens Distortion Removal
05:17

4.Color Correcting Aerial Footage
1 lesson, 07:04

4.1
Basic Color Correction
07:04

5.Footage Speed
4 lessons, 18:19

5.1
Slow Motion
02:23

5.2
Speed Ramping
08:32

5.3
Faux Slow Motion
03:48

5.4
Adding Motion Blur
03:36

6.Stabilization
1 lesson, 10:41

6.1
Stabilizing a Shot
10:41

7.Zooming in Post
1 lesson, 04:45

7.1
How to add a Faux Zoom to a Shot
04:45

8.Color Grading Aerial Footage
1 lesson, 11:26

8.1
Color Grading
11:26

9.3D Camera Tracking Aerial Footage
1 lesson, 07:43

9.1
3D Camera Tracking
07:43

10.Conclusion
1 lesson, 00:59

10.1
Conclusion
00:59


3.1 Reducing 'Jello' Effects in Post

All right now we're working in After Effects, and I'm gonna show you guys some different techniques you can use to try and reduce the gel effects in post. Now emphasize try, because you're gonna find this is very case by case basis kind of thing where, on some clips this will be effective and others it won't. It's a common misconception to think that just because these removal effects exist, that they're gonna be 100% effective, and I can assure you they will not be. But, in some cases, you don't have a choice where you've got a shot and it's got warps on it and you need to remove them or at least reduce them. I'm gonna show you guys now some different ways you can do that to hopefully make your footage at least passable. There's a few different ways we can go about doing this in the After Effects, so let's get to it. All right, so the clip I'm gonna be working with today is a snow scene that I filmed using my drone. And this clip is gonna be included in the project files so you can download it and follow along with this lesson. You can see we're looking down on snowy terrain here with some bare trees. I'm gonna go ahead and do a RAM preview of this, just we can see where the rolling shutter is occurring. So I'm gonna hit 0 on the keyboard. That'll run through, and I'm gonna skip ahead here to where that's done RAM previewing. So now we can see a sample of the clip here, and we can see a little bit of the rolling shutter artifacts going on. This may be very difficult to see with the compression of this tutorial. Basically at this top left-hand side, we'll be able to see a little bit of jello warping going on, I'll RAM preview that again. You can see just a little bit of shutter shaking going on right here. I'm gonna blow this up too so you can see this, just so you can hopefully see the distortion on this tutorial. The warping is very subtle but we're gonna try to remove that here in this example. So I'm gonna take the example clip, I'm gonna drag it down and create a new composition right here. And because this clip is filmed in 4k it's created a 4k composition, and I actually just want a 1080p composition cuz that's what I typically export to. So, I'm gonna right-click Composition Settings, I'm gonna change the width to 1920 and it'll automatically change the height to 1080. If it doesn't you can just type in 1080. And I'm gonna name this composition Scene, and I'm gonna click OK. Now we can see our composition is 1920 by 1080 and our footage is still 4k, so it's much larger than our composition. This is actually the first steps you can do to try to reduce gel effects because the gel effects are very subtle, just by down scaling your footage from 4k to 1080p, it's basically gonna compress those pixels and effectively reduce the distortion. The distortion's still gonna be there, you're still gonna have the gel effects, but they're gonna be a little more subtle than they were when you're viewing it at the full resolution in 4k. So what we can do to do this, click on your clip, go up here to Layer > Transform > Fit to Comp Height. You may be tempted to click Fit to Comp, but in some cases your footage maybe actually wider than 1920 by 1080 and this will actually scale your footage a little bit skewed. So it's better to click Fit to Comp Height, that way if your clip was filmed at a wider aspect ratio it won't get squished effectively when it gets resized. Okay, now let's do another RAM preview of this just to see what the reduction looks like so far. So I'm just gonna click here, I'm gonna hit 0 on the numeric keypad to do a RAM preview. So now we can see the preview here. We're viewing this at 50%. And you can still see some of the subtle shaking going on there. But again, cuz this is now at 1080p, that's gonna be a little bit reduced as opposed to what it was at 4k. But now let's move forward and look at a way where we can hopefully counter the actual gel effects occurring on the footage. The first way I recommend doing that is the rolling shutter effect. So I'm gonna go up here to the window and I'm gonna click on to view the effects panel. And I'm just gonna type in rolling shutter. Actually there it already pops up by just typing roll. I'm gonna drag this and place this on the example clip. I'm going to close the effects and presets panel for the time being, just so we have more room to see here. In my opinion the rolling shutter repair is gonna be the best effect you can use to effectively remove the jello from your footage. It's my first choice when I'm trying to remove gel effects. This may or may not work for you but we're gonna find out on this clip here. And what this is gonna do is basically look at the footage frame by frame, and analyze what it determines is a rolling shutter when it gets offset throughout the clip. And so I typically leave these at pretty much the standard settings. It's gonna have a rolling shutter rate and 50%, the scan direction's gonna be from top to bottom. That's what it is in this case, in this goPro footage. In most action camera footage it analyzes the top first and goes down to the bottom. Now for method we have two choices, we have warp and pixel motion. And depending on how much time you have for your render, it may depend on which choice you choose. Warp is generally gonna be a little bit faster, but it's not gonna correct it quite as much. I've had more luck using Pixel Motion. Now this is gonna slow down your render time quite a bit. You can see that it took a little bit longer time just to load this one frame. If I just jump around here, you can see it takes quite a bit longer just to render one frame. So if you have a lot of time and you want to test this out, definitely try this. Again, this is going to be a very render heavy effect, so this may be something you just wanna try on a little sample of your footage first before you render out your entire clip because it will take a long time to render. So what I'm gonna do here is I'm gonna click on my clip here, I'm going to hit b on the keyboard, and just click down a little bit further, hit n. Just make my work area a little bit smaller in my composition here. Now I'm going to hit 0 to RAM preview this. Now, this will take quite a long time, so I'm going to speed this part up. So if you are following along with this lesson in After Effects, just be prepared, this is probably going to take about 10 to 15 minutes to RAM preview just this little section. So I'm gonna hit 0 on the numeric keypad, and we'll let this run through and I'll be back when this finishes. All right now, the RAM preview's finished we can go ahead and preview it here. And we can see in the top left corner here, the rolling shutter appears to be very much reduced. I can still see a few little instances of it but it looks a lot better than it did. And so in this case the solution is working pretty effectively. I'm gonna zoom in here just so we can RAM preview this a little bit closer. So we can still see a few warps here and there, but in effect it's a lot better than it did. So I would say in this case, if this worked for us, using the rolling shutter repair with the pixel motion. However, there's another method you might try and I'm gonna show you that now. I'm gonna delete the rolling shutter repair effect. Now I'm gonna bring up the tracker panel under Window > Tracker. The other solution is using the warp stabilizer effect. So I'm gonna select my footage and I'm gonna click Warp Stabilizer. Now it's automatically gonna start analyzing your footage, we don't want it to do that yet, so I'm gonna click Cancel over here. And Warp Stabilizer, this is a popular effect to try to reduce the rolling shutter. It's actually better at stabilizing the camera, which a lot of times we get rolling shutter because the camera isn't stable. However in our instance, the gel effect on our footage is so prevalent that the warp stabilizer is likely not gonna recognize it as a camera shake, it's just gonna think it's actually part of the footage. It's still worth trying depending on your shot, so I'll go ahead and show you this now. Which will do under Warp Stabilizer effect. Under stabilization, leave that at smooth motion, and for smoothness, you can go ahead and leave that at about 50%. For method, you're gonna wanna make sure this is on Subspace Warp, that's what it is natively, but this subspace warp is effectively gonna warp and distort the footage to basically counteract any rolling shutter. On the frame, you're gonna go ahead and leave that at Stabilize, Crop, Auto-scale. And what we need to do now is tab down the advanced settings and check on Detailed Analysis. Now again, AfterEffects, when you check this, is automatically gonna start analyzing the footage. We don't want it to do that so you're gonna need to click Cancel again. Okay, the other option under the advanced settings we wanna take a look at is a Rolling Shutter Ripple. Now it's gonna be default set to Automatic Reduction, we're gonna wanna change this to Enhanced Reduction. And for the Crop Less and Smooth More, I like to set this around 10 to 20%, in this case, I'm gonna set it at 12. Because basically, we don't want to crop in too much on our shot, cuz that's not what we're looking to do. We're looking more to remove the rolling shutter effect on the footage. And that's pretty much all we need to set up on this. So after we've set that up, go ahead and click Analyze. I'm gonna let this analyze, and I'll skip ahead to when this is finished. Okay, now the analysis is finished. It took about nine minutes, so you can tell it's quite a lengthy process. And unfortunately, now that I'm looking at this after this is completed. I'm gonna zoom in here so you guys can see this a little bit clearer. I can still see quite a few gel effects going on here on the footage. So in this case the warp stabilizer did not work at all, and actually, I would almost argue that it made it worse. So you can see it's a very case by case basis when you're using these effects. I do think the rolling shutter repair works quite a bit better than the warp stabilizer, but then again you do wanna check out both just in case it works better for your shot. Hopefully the three methods we went over in this lesson will help you out to reduce any rolling shutter effects you do have in your footage. Reducing gel effects on our footage is probably not the most exciting thing in the world to do, but it's something we definitely needed to tackle first. In the next lesson, we're gonna look at how you can remove fisheye distortion from your aerial footage.

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