6 Replies Latest reply: Dec 30, 2012 10:24 AM by Todd_Kopriva RSS

    Tweaks to get good results in camera tracker?

    Sebasvideo Community Member

      Today I shot very simple footage with my Canon 60D DSLR to use as practice for inserting 3D objects using Element 3D. Basically the footage is handheld, camera forward while I'm walking towards the front door, opening it, which gives a view of the front yard and the porch in the foreground. I keep walking past the porch and then rotate the camera towards the right, then tilt upwards a bit. After that, I rotate the camera to the left. The plan was to insert 3D objects to both left and right.

       

      Usually when I use the CS6 camera tracker I get pretty good results, but this time I'm getting "analysis solve failed" on all four takes. Or, it stays on "Solving camera" for minutes on end, when these are clips shorter than a minute and usually that takes no time to solve.

       

      I thought this footage was going to be easy to track because last weekend I shot some footage also in the front and back yards and it tracked perfectly, especially because there are lots of dry leaves that provide good points of reference. But today it's just not working, even if I do a detailed analysis. Note that the footage is properly exposed, and there's plenty of detail

       

      Are there any tweaks I can make? I tried adding levels to add more exposure and it didn't help. Sharpening also didn't help. I'll keep trying different filters (always before the camera tracker one), but does anybody know of a better way (without buying a 3rd party tool) or a specific filter that will give me good results?

       

      Thanks,

       

      Sebastian

        • 1. Re: Tweaks to get good results in camera tracker?
          lasvideo Community Member

          Im very curious as to why you are having such problems with your footage.

           

          You are covering a lot of territory with your move. Try breaking up the shot and using just the portion where you walk up to the porch and get out before you pan right. See if you get any different results.

           

          If you want to make it accessible  it might make it easier to analyze why its failing.

          • 2. Re: Tweaks to get good results in camera tracker?
            Todd_Kopriva Adobe Employee

            As Tom says, you should break this up into pieces.

             

            The simple pans/rotations/tilts won't have any actual 3D camera movement in them; they are essentially 2D tracking shots since there is no parallax from the camera moving.

            • 3. Re: Tweaks to get good results in camera tracker?
              Sebasvideo Community Member

              lasvideo wrote:

               

              You are covering a lot of territory with your move. Try breaking up the shot and using just the portion where you walk up to the porch and get out before you pan right. See if you get any different results.

              Actually I did that, and the walking portion gave me results, but if I start a new layer as I pan right, how would I ensure that the camera stays in the same place on that second layer? If it doesn't I would see a jump and the object that was in one place in the first layer would suddenly be in another in the second layer. I guess in that case maybe a null and parenting to that null for the second layer would work, but I just woke up so this could be total nonsense

              • 4. Re: Tweaks to get good results in camera tracker?
                Sebasvideo Community Member

                I'm also wondering, is there a preferred shutter speed for camera tracking? I thought that a high speed would be better becaused there's more detail and less motion blur, but maybe my assumption is wrong?

                • 5. Re: Tweaks to get good results in camera tracker?
                  lasvideo Community Member

                  As Todd said, a shot that is panned doesnt give the tracker the parallax info needed to do a 3D track. Ive seen tutorials where you can kind of fake object placement in a tripod (static panning) type shot, but not when it is part of a long sequence of camera moves that may preceed it.

                   

                  The only thought I have is to place a reference obejct where you want your object to be and use Mocha to object track. Then place your object over the reference one in AE. It might do better then using the 3D cameratracker.

                   

                  Either that or while doing your pans also move the camera thru 3D space to give the 3D cameratracker the info it needs.

                   

                  I have not come across any preferred shutter speeds, but I have seen how the rolling shutter issue with DSLR cameras can throw a camera track off.

                  • 6. Re: Tweaks to get good results in camera tracker?
                    Todd_Kopriva Adobe Employee

                    I agree with Tom that mocha is better for the 2D tracking parts of the shot.