Need some guidance on tracking & stabilize 'moving forward' shot

I’m shooting a hyperlapse and have been successful in using Mocha to solve stabilization for side to side shot, but moving forward is a bit tricky.

Here are what I am trying to track (it keeps on moving toward the front gate):
Image: http://farm8.staticflickr.com/7384/10164507114_e3a6968bc5.jpg
Image: http://farm4.staticflickr.com/3719/10164506784_1c5c6bd4c6.jpg
Image: http://farm8.staticflickr.com/7383/10164746513_4b1a1011e6.jpg
Image: http://farm3.staticflickr.com/2886/10164505934_15c455f340.jpg

I tried the roof only but then as it moves forward, the spline will be left behind.
Also, I tried stabilized just part of the footage (tracked the roof), to get the best stabilization, Mocha tries to crop in to compensate (I guess Mocha doesn’t detect zooming effect because of the footage moving forward, I tried zoom parameter but it didn’t help).

Image: http://farm8.staticflickr.com/7457/10164622675_ab36d90d4e.jpg
Image: http://farm3.staticflickr.com/2809/10164505184_8689fe85dd.jpg
Image: http://farm6.staticflickr.com/5331/10164621925_3088127a27.jpg

—Quote (Originally by martinb)—
You can create additional splines to the roof by stopping the track at any time and using “add spline to layer”.

I would recommend tracking from the end of the clip backwards, as you have more detail there to begin with.

Are you using the Stabilize tool, or just exporting the tracking data?
—End Quote—
I will try that and report the result. Yes I used the Stabilize Tool ( X & Y Translation, Rotation, Zoom).

I think I’m still doing something wrong.
Image: http://farm8.staticflickr.com/7346/10246398885_48eff08081.jpg

—Quote (Originally by martinb)—
If you don’t want to lose as much information you will either have to:
A) Reduce the amount of Frames used (if you are just getting rid of jitter a Frames value of 3 will probably suffice).

B) Set “Fixed Frames” to lock down the frames and smooth the result between them.

A combination of these will probably give you what you need.
—End Quote—
Hi Martin,
I have made some successful progress with add more splines (Tracking Backward). It’s pretty smooth in Stabilize Tab (in the Frame List box, I include the frames that are the beginning of new splines).

Now I find it difficult to track near the end (or even through out the footage going backward) because of too many splines in one layer.

Do I need adjust old splines (they’re not out of screen but just very difficult to put them in the same position again) ?

As it gets near the end, the many splines make it very slow to track, I wonder if there’s a way to “deactivate” the old splines “from certain frames” (like working with many layers, layer has In and Out point; however Stabilize Tab doesn’t work with many layers as far as I know)

Image: http://farm8.staticflickr.com/7303/10263618765_41f057ea60_b.jpg

You can create additional splines to the roof by stopping the track at any time and using “add spline to layer”.

I would recommend tracking from the end of the clip backwards, as you have more detail there to begin with.

Are you using the Stabilize tool, or just exporting the tracking data?

If you don’t want to lose as much information you will either have to:
A) Reduce the amount of Frames used (if you are just getting rid of jitter a Frames value of 3 will probably suffice).

B) Set “Fixed Frames” to lock down the frames and smooth the result between them.

A combination of these will probably give you what you need.

T is right. But you can also just arrange the spline as you track, turn parameters on and off as you track, and animate the spline out of the way as long as the spline stays on the same plane. Feel free to delete or add shapes and points on layers as you track as you need to, it won’t affect the tracker. Just the spline.

I just scanned through everything quickly, but my workflow for these types of shots is to create and hand keyframe the spline to follow the big unobscured areas first, then Link Track to None and track that way. Tricky part is trying to blend in parts of the shot that have unavoidable objects (like trees and cars when you’r trying to track buildings in a vehicle POV shot) moving through.

Also, I’ve had tons of good results in otherwise impossible situations by using Transform only or Transform Scale Rotate. Really depends on which direction the camera is most unstable.

Another strategy is to render out ‘passes’
use minimal smoothing and render and then retrack…

T