Long Pan + Zoom Shot Needs Stabilizing

Thanks again, Martin.

I’m making progress, however slowly. I’m going to practice on similar shots that aren’t so difficult. I think I need to be more of an “artist” while creating the splines, so that they simulate the perspective of the plane of the playing field. I haven’t been very careful about that so far.

-Jeff

What is the aim for the clip? Are you trying to track something in or rotoscope?

The ground plane (ie. the grass) appears to be the best place to track, but you may run into some problems in the zoom unless you follow it closely.

You will need to keep moving your track shape to keep more areas of the grass in the track, while avoiding the kids.

Basic advice:

  1. Turn persepctive on in the track
  2. Draw multiple shapes in the same layer
  3. Turn your minimum % pixels up to about 90%
  4. Move the shapes around the plane to avoid interference

You can get a reasonably decent result with this. As a first quick pass I was able to get a reasonable lock up until the zoom, then it settle again when close up. Adjust Track module could fix this drift if necessary.

What is the aim for the clip? Are you trying to track something in or rotoscope?
The ground plane (ie. the grass) appears to be the best place to track, but you may run into some problems in the zoom unless you follow it closely.
You will need to keep moving your track shape to keep more areas of the grass in the track, while avoiding the kids.
Basic advice:

  1. Turn persepctive on in the track
  2. Draw multiple shapes in the same layer
  3. Turn your minimum % pixels up to about 90%
  4. Move the shapes around the plane to avoid interference
    You can get a reasonably decent result with this. As a first quick pass I was able to get a reasonable lock up until the zoom, then it settle again when close up. Adjust Track module could fix this drift if necessary.

When stabilising you will need to do the rotation expression to counter the track, but it depends on what you want to stabilise. Scale is less important as you are dealing with zoom.

Alternatively, take a look at the stabilisation module in the full version of mocha. This gives you much more control over stabilising the shot. You can download a 30 day trial from our site if you want to check it out: Boris FX | Downloads

When you export transform data, x and y will always be retained. You would have to use an expression to remove the tracking data.

One way to do this would be to apply the exported data to a null, then use an expression on your footage by doing the following:

  1. Alt click your position key to open the expression for that value
  2. Leave “transform.position” there, but add a [0] to the start so your line reads “transform.position[0]”
  3. Add a comma, then use the pick-whip to drag up the Y value in your position data on the null
  4. Place square brackets around the whole equation
  5. You should now have an expression similar to this: [transform.position[0],thisComp.layer(“Null 1”).transform.position[1]]

This should leave your footage X position alone and only use the Y value from the null.

When you export transform data, x and y will always be retained. You would have to use an expression to remove the tracking data.
One way to do this would be to apply the exported data to a null, then use an expression on your footage by doing the following:

  1. Alt click your position key to open the expression for that value
  2. Leave “transform.position” there, but add a [0] to the start so your line reads “transform.position[0]”
  3. Add a comma, then use the pick-whip to drag up the Y value in your position data on the null
  4. Place square brackets around the whole equation
  5. You should now have an expression similar to this: [transform.position[0],thisComp.layer(“Null 1”).transform.position[1]]
    This should leave your footage X position alone and only use the Y value from the null.

If you have a continuous relative plane to track, you may even unlink the track from your spline entirely (In the drop down on the left panel), but you can also move or create new splines within the layer as you need them. I find it best to keep the surface or grid on while you track to make sure it looks consistent however.

If you have a continuous relative plane to track, you may even unlink the track from your spline entirely (In the drop down on the left panel), but you can also move or create new splines within the layer as you need them. I find it best to keep the surface or grid on while you track to make sure it looks consistent however.

Yes. In order to use the corner pin however I would suggest inverting.

Yes. In order to use the corner pin however I would suggest inverting.

—Quote (Originally by hi-mocha)—
wondering if it’s possible to request a tutorial on stabilizing long pans (to take into account pans, track, skew and tracks that leave the screen)…I’m having difficulty smoothing out my handheld shots.
Thank you if you can.
—End Quote—
We have posted a stabilization tutorial on our blog, however it relates to versions of mocha with the stabilize module: http://blog.imagineersystems.com/2010/11/tutorial-mocha-pro-intro-to-stabilize.html
We can look at doing a stabilization tutorial focusing on just using the track information in future, but we have a few tutorials we need to get done first. :slight_smile:

—Quote (Originally by hi-mocha)—
wondering if it’s possible to request a tutorial on stabilizing long pans (to take into account pans, track, skew and tracks that leave the screen)…I’m having difficulty smoothing out my handheld shots.

Thank you if you can.
—End Quote—
We have posted a stabilization tutorial on our blog, however it relates to versions of mocha with the stabilize module: http://blog.imagineersystems.com/2010/11/tutorial-mocha-pro-intro-to-stabilize.html

We can look at doing a stabilization tutorial focusing on just using the track information in future, but we have a few tutorials we need to get done first. :slight_smile:

—Quote (Originally by hi-mocha)—
OK, thanks…still not sure on the workflow for long pans where tracks go offscreen…i look forward to the eventual post =)
—End Quote—
hey buddy same is the case here…hope we can share our information :slight_smile: