After having my camera tracked, I decided to put in a cube for testing. But then I've noticed this strange artifact where every object kinda flickers and changes it's rotation.
1 Answer
You can clearly see the tracker shifting on the video posted on the question, and it happens at the moment where the reconstruction fails.
Successful reconstruction can only be achieved with accurate tracking
You should aim to have a solve error of less than 0.3 pixels.
There are plenty of tools to help you get more accurate tracking.
Read:
Solve error high with good track?
Motion Tracking. What do the graphs represent and how are they useful?
Does the motion tracker follow a point if it changes colour throughout the video?
For a comprehensive post on motion tracking tips read
How can I get better results when doing camera motion tracking?
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$\begingroup$ will a better solve also help me with my world alignment issues? i've been having this problem where the trackers and the camera are slightly tilted on Y and X axis and they're not on Z = 0, so I have to rotate my model for it to look good $\endgroup$ Jan 16, 2020 at 9:14
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$\begingroup$ different questions should be asked in a new post, not as comments... but before you post you can also use the big "search on blender" box at the top. $\endgroup$– user1853Jan 17, 2020 at 6:17