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Inspiring
July 20, 2017
Frage

3D Camera Tracker Not Working

  • July 20, 2017
  • 2 Antworten
  • 31658 Ansichten

I'm having a devil of a time getting the 3D Camera Tracker to work consistently in After Effects CC 2017.  Most of the time, it doesn't work.  I have been using it on only one clip. The only way it'll work at all is to put the clip in a new comp. But, again, most of the time it doesn't work.  The camera tracker will create the tracking points and I use the target to choose at least 3 tracking points (though I've toyed with different numbers of tracking points chosen). However, when I right click to create text, most of the time the text simply stays in place instead of moving as if "stuck" to the video. Other times, it works and the text moves as if "stuck" to the video. These mixed results happen with no other settings being changed. That being said, I've also tried changing the 3D Renderer in Composition settings.  I've tried all the options.  It didn't seem to help.  Can anyone shed some light on this subject, please? Why the inconsistent results?

Thanks in advance,

Jorge

AE 2017 cc 2017

Intel i5

6 gigs RAM

video clip is drone footage looking down on a piece of land

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2 Antworten

Participant
January 15, 2019

Hello. I am wondering if anyone could help me. I am trying to add 3d text I made in cinema 4D into a Fortnite montage and use the track camera but every time I try to analyze it, it says, "unable to acquire rendered frame." The video is in 1080p 60fps but it is still saying this. Someone help!

Thanks.

Community Expert
July 20, 2017

To successfully use AE's camera tracker you must have very little lens distortion in the shot. This is a common problem with wide angle lenses even on professional cameras. The other common problem is that there are too many things that are moving in different directions in the shot. A hand held shot of a bunch of people walking down the sidewalk is extremely difficult to track because there is not enough fixed geometry in the shot to establish and calculate changes in parallax. A shot of a wheat field with the wheat blowing in the wind or a shot if the ocean is impossible to Camera Track because there is nothing but a horizon that is not moving.

Another really common problem is trying to camera track a shot that is too long or makes some unexpected changes in direction. You should trim your shot to just the frames you need to actually track. For example I recently had a shot of a couple of actors walking down the street talking that ran for about 20 seconds. I had to replace a sign in a window they walked past with a new graphic. The window was inly in the shot for 4 seconds but the sign I needed to replace was only in the shot for about 3 seconds so I trimmed the shot to the just over 3 seconds, ran camera tracker, replaced the sign in my just over 3 second comp, rendered the composite, then cut the composite into the original shot. In the past I have cut one shot up into seven or eight segments and camera tracked each segment separately, then put the shot back together. This is by far the most efficient way to work.

I hope this helps. It wold really help us point you in the right direction if we could see the shot you are having problems with.

Inspiring
July 20, 2017

Thanks for the speedy answer, Rick! 

*  The video is of a parcel of land near a highway.

*  I'm trying to use 3D Camera Tracker to insert 3D text of the name of a street on the street, itself

* The shot is 14 seconds long.  In your experience, is this too long?

* Really, the only movement in the shot is part of the drone on the left side of the frame and then, toward the end of the clip, some cars on a highway in the distance (to the right of the frame). 

* There are no unexpected changes of direction.

* The shot is trimmed to exactly what I need tracked.

It's not my shot, so I can't load it to YouTube, etc.  I wish uploading a video file from my computer was a possibility on this forum, as it is for pictures. 

In the meantime, I'll try breaking it into smaller segments to see if it will apply the tracking info to the text.

Thanks,

Jorge

Participant
October 28, 2017

Jorge,

Did you try Rick's suggestion? If so, how did that work out? Let us know, or if you need more help.

Thanks,
Kevin


Hi,

I got something similar, my tracking is not working too.
I tracked my shot with camera tracker, at this point I selected "Render track points" and all the colorized points appeared .
But then there were no way to select 3 of them to get the target and create null + camera ...

Hope there is a way to solve the problem ...

Best,

Henri