Stabilization of Timelapses

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flixit

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Stabilization of Timelapses

PostTue Feb 16, 2021 12:26 pm

Hello,
I sometimes capture timelapses with my drone, without changing position. Because of wind and other factors the video bacomes a bit shaky. I tried to stabilize the video withe the function stabilize in the inspector, but it do not work very well. I have some points, eg. the earth surface as fix reference, can I use this for better stabilization? Is there a method for such thing?

Thanks,
Felix
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Uli Plank

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Re: Stabilization of Timelapses

PostWed Feb 17, 2021 3:15 am

Try either the older point stabiliser or the one in Fusion, it's really good.
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flixit

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Re: Stabilization of Timelapses

PostFri Feb 19, 2021 3:20 pm

Thanks! I searched a lot in the web, but I could not find a video or tutorial, how to use this point stabilizer.
Can you help me?

Regards,
Felix
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flixit

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Re: Stabilization of Timelapses

PostTue Feb 23, 2021 11:11 am

Sorry for reposting, but can anyone help me? I still have not found a satisfying solution.

Thanks,
Felix
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panos_mts

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Re: Stabilization of Timelapses

PostTue Feb 23, 2021 12:25 pm

Did you apply a speed change to the clips?
if yes, try to create a compound clip for each clip and apply stabilization to compound clips,
this way the stabilizer will take into consideration the movement of the speeded up footage.
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ttakala

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Re: Stabilization of Timelapses

PostTue Feb 23, 2021 1:36 pm

This tutorial may help. It shows the old stabilizer, now known as classic stabilizer found in the three dots menu in the stabilizer panel.


It's also a very good tutorial series in general. Even though it's for Resolve 12, the basics are mostly the same. You may recognize a familiar voice from the Resolve Color Grading tutorials at: https://www.blackmagicdesign.com/produc ... e/training
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flixit

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Re: Stabilization of Timelapses

PostTue Feb 23, 2021 8:33 pm

Thanks.
I used the Tracker Mode under "Color" and clicked on stabilize, bute it does not work well, also when I use the camera lock. I think the problem is that it also uses the clouds in my footage, which are in motion. Does anyone have an ideas?

Thanks,
Felix
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Uli Plank

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Re: Stabilization of Timelapses

PostWed Feb 24, 2021 12:42 am

The point tracker should avoid that. Or you could use a mask to exclude the clouds.
I'd say it's time to learn Fusion.
Resolve Studio 17 and Fusion Studio 17 under MacOS Mojave 10.14.6
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Marc Wielage

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Re: Stabilization of Timelapses

PostWed Feb 24, 2021 6:58 am

ttakala wrote:It's also a very good tutorial series in general. Even though it's for Resolve 12, the basics are mostly the same. You may recognize a familiar voice from the Resolve Color Grading tutorials at: https://www.blackmagicdesign.com/produc ... e/training

I believe that is Daria Fissoun, a colorist from the UK and Europe who sometimes works for Blackmagic. She is excellent and does a terrific job with her tutorials.
marc wielage, csi • VP/color & workflow • chroma | hollywood
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ttakala

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Re: Stabilization of Timelapses

PostWed Feb 24, 2021 10:32 am

Marc Wielage wrote:I believe that is Daria Fissoun, a colorist from the UK and Europe who sometimes works for Blackmagic. She is excellent and does a terrific job with her tutorials.

Indeed, she's very clear and to the point!

flixit wrote:I used the Tracker Mode under "Color" and clicked on stabilize, bute it does not work well, also when I use the camera lock. I think the problem is that it also uses the clouds in my footage, which are in motion. Does anyone have an ideas?

In the video that I linked, Daria shows how you can delete some of the tracker marks. That may help with the clouds. You may also want to read chapter 115 Motion Tracking Windows in the manual for how to use the point tracker which Uli mentioned. Or dive into Fusion for more control.
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Sander de Regt

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Re: Stabilization of Timelapses

PostWed Feb 24, 2021 10:42 am

Can you post a still of a couple of your shots?
I have done a tutorial on stabilizing a horizon without recognizable points a couple of years ago.
The UI is different, but the method still applies

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flixit

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Re: Stabilization of Timelapses

PostThu Mar 04, 2021 9:36 pm

Thanks! Here ist a short example video (original data). I wanted to stabilize and speed it up 800x, but it didn't work. Maybe the material was too bad?


Regards,
Felix
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Sander de Regt

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Re: Stabilization of Timelapses

PostFri Mar 05, 2021 9:19 am

The material is beautiful. Not much to track though, so that might have been part of the issue.
When looking at it it's hard to see any movement at all, I guess the shakiness appears when you speed up the video?

Usually when doing a stabilize I recommend stabilizing first and then speeding up, because it makes it easier for trackers to stay focused if the 'jumps' aren't too big, but since the movement is so subtle in this footage, maybe you're better off speeding up first and stabilizing later?
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flixit

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Re: Stabilization of Timelapses

PostFri Mar 05, 2021 9:37 am

Thanks. Yes, the footage looks very smooth in "normal speed", but when I speed it up, it doesn't look good anymore.
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Hendrik Proosa

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Re: Stabilization of Timelapses

PostFri Mar 05, 2021 10:32 am

Stabilization based on those small reflective puddles and a piece of well defined horizon line (on lefthand side there are specific patterns) should do the trick.
I do stuff.
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Sander de Regt

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Re: Stabilization of Timelapses

PostFri Mar 05, 2021 1:17 pm

I just ripped the video from Youtube and played a bit with it, and I think I see the problem with stabilizing. It appears that there has been a bit of a rocking back and forth motion in the shot (which changes the tilting angle of the camera on the drone). Probably because of the wide angle lense this means that there is *a lot* of distortion in the shot compared to say a hand held shot on ground level where you'd want to compensate for the movement of the operator.

So I got a technically pretty stable shot, but this resulted in lots of visible warping in the rest of the frame.

I'm not sure if this is a good analogy, but here goes:

You could compare it by stabilizing a cape that's flapping in the wind, slightly towards you.
Say you hold the cape up by two points with two hands. You can stabilize the hands and the top line of the cape, so that part of the shot will become more stable but the distortion of the cape itself will only be made worse because of this.

If you want to truly stabilize this, you probably would have to do a camera track, extract the distortion, undistort the footage etc.

Syntheyes could probably get you a long way there, but then you come back to the original issue: there's just not much to track in the shot that's actually a fixed point, so getting a decent cameratrack won't be easy.
Sander de Regt

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Hendrik Proosa

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Re: Stabilization of Timelapses

PostFri Mar 05, 2021 1:57 pm

If there is perspective distortion from rotations (not just lens distortion), the only real way to properly solve it is to remove lens distortion, do a nodal pan camera track, project image onto sphere and do a new stabilized render off of that.
I do stuff.
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flixit

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Re: Stabilization of Timelapses

PostSat Mar 06, 2021 10:29 am

Sander de Regt wrote:I just ripped the video from Youtube and played a bit with it, and I think I see the problem with stabilizing. It appears that there has been a bit of a rocking back and forth motion in the shot (which changes the tilting angle of the camera on the drone). Probably because of the wide angle lense this means that there is *a lot* of distortion in the shot compared to say a hand held shot on ground level where you'd want to compensate for the movement of the operator.

So I got a technically pretty stable shot, but this resulted in lots of visible warping in the rest of the frame.

I'm not sure if this is a good analogy, but here goes:

You could compare it by stabilizing a cape that's flapping in the wind, slightly towards you.
Say you hold the cape up by two points with two hands. You can stabilize the hands and the top line of the cape, so that part of the shot will become more stable but the distortion of the cape itself will only be made worse because of this.

If you want to truly stabilize this, you probably would have to do a camera track, extract the distortion, undistort the footage etc.

Syntheyes could probably get you a long way there, but then you come back to the original issue: there's just not much to track in the shot that's actually a fixed point, so getting a decent cameratrack won't be easy.


Thanks a lot for your time and your help!
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flixit

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Re: Stabilization of Timelapses

PostSat Mar 06, 2021 10:58 am

Hendrik Proosa wrote:If there is perspective distortion from rotations (not just lens distortion), the only real way to properly solve it is to remove lens distortion, do a nodal pan camera track, project image onto sphere and do a new stabilized render off of that.


Thank you! Sounds difficult.
So there is no easy way to avoid these problems already when shooting with the drone.
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Hendrik Proosa

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Re: Stabilization of Timelapses

PostSat Mar 06, 2021 2:52 pm

Well, easy is kind of relative. You can do a simple, maybe not so ideal solution or more elaborate, possibly visually better solution, or something inbetween. If simple stabilization which corrects for rotations and translation doesn’t give satisfying result, try some warp based stabilization. If that doesn’t work either, I’d personally do the technically correct setup which I described earlier, because there isn’t much more one can do in post (besides reprojection on actual scene geometry).
I do stuff.

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