I am trying blenderguru’s camera tracking video tutorial http://www.blenderguru.com/videos/introduction-to-camera-tracking/
In the video the white markers you see are filmed by placing white paper wrapped around coins on the street.
Is it necessary to film with white dots for placing the markers later on in blender.
No. You just need to select points in the video which have high contrast, and appreciable parallax.
Ok thanks.
I have made a simple movie H264 1280x720 resolution 30 frames p/s
But I cannot get the camera motion solve error below 7.7255
I have used a samsung GT-N7000 mobile and used these settings.
Focal length3.97 mm
Sensor size4.55 mm x 3.41 mm
Do I need a better camera for motion tracking or do I have to set better tracking points.
It might be good if you posted two or three frames from your movie.
When you were setting the markers, did the markers frequently loose their tracks ?
Try not to use intersections of overlapping lines as track points as they will change as you move. Also the cloud might move a bit instead of being a fixed point.
Ok thanks.
Followed another tutorial things are going better now.
Here’s a tutorial showing how to use Masking and Cloning to remove markers from footage. (skip ahead to about 9:50)
I think this technique only works if the camera isn’t moving around too much. If the camera is walking around a lot I think that the cloning technique would become obvious. Someone can correct me if I’m wrong.
Also, in the tutorial you posted in your first post, all the markers are covered up by the hole so there’s really no need to remove them. So if you’re planning to have a large 3D object on the ground, you can position your markers so that they’ll be covered up by the object and you won’t have to worry about removing them.
You can use coins, rocks, poker chips, pieces of masking tape, etc. If you’re shooting in grass, use some cheap plastic golf balls propped up on tees.
I think you’ll get better tracking results if you choose your own markers in the Camera Tracker, rather than letting the program select. Looking at the screenshots you posted, the pavement and grass can be very difficult to track because one small patch of asphalt looks identical to the small patch next to it, so the tracker gets confused and starts bouncing around. The same is true of grass. Every blade looks alike to the tracker. For the type of scene you’re filming, I’d definitely try placing some rocks or coins on the ground and refilming.
Steve S
Thanks for the explanation.
The camera is not moving or rotate at all.
I placed background markers as showed in the first tutorial and indeed the tracker was getting confused
and started bouncing. Is it necessary to place background markers?
What should I type under solve Keyframe A:1 Keyframe B: 30 because my camera shot is not zooming or moving.
Thanks for the marker tips I have no golf balls but I guess ping-pong ball will do also.
but what about placing markers when filming a river.
Umm, if the camera is not moving, what exactly do you expect to track? The tracker NEEDS movement to determine depth from parallax change (distant objects move slower than closer objects).
Filmed it by hand not very steady.
But without zooming or rotating.
The girl is skateboarding in a big circle.
the intention is to make a hole in the middle of the pavement.
Anyhow thanks for your answer.
If you’ve got a tripod you can use it as a steadicam.
If you don’t have one, this guy shows how to make a steadicam out of plumbing parts for about $14.
http://14dollarstabilizer.org/
Having smooth video should help with tracking because there should be less motion blur from shaky hands.
As 3pointEdit mentioned, you definitely need some movement to get parallax. For the Keyframes, you just want to choose a part of the video where there is good movement for parallax.
For example, if the camera is moving for the first few seconds and then stops moving while you keep filming, you would want to choose Keyframes from the part of the video where the camera is moving. A span of about 30 or 40 frames should be enough. Blender just sets the frames from 1 to 30 by default.
Steve S
Apparently I can’t post a thread here, so I am going to ask here. Is it possible to do a camera track of an area, place a building there, and then have people walk in front of the building? I’m not really sure if it is possible, since, considering how the software probably thinks, that everything is behind the object. Is there away to have a moving person walk in front of the building? Thank you to any that reply! I tried to post a thread, but I was rejected. 
Thanks but I had no tripod that moment but you are right.
Although a film has not always zooming or rotating for example filming a parking place or a slider camera
at one speed.
In my sample the movement is coming from the girl skateboarding.
In that case how do you set the Keyframe A Keyframe B input or should I simple select Keyframe Selection.
Another try with one marker. I lose the track marker when the girl is getting in front.
