3D Camera Track; Analysis solve failed.

There's not much to fix. Either it works or it doesn't. You have to keep in mind that virtual cameras from 3D games are often not physically-based to begin with, meaning their results are implausible and cannot produce a valid camera solution. The rest comes down to the usual issues - lack of contrast, insufficient numbers of trackable features, buffer tearing/ rolling shutter, blurry textures, artifacts, moving objects throwing the tracker off etc.. Combined with the fact that AE's tracker doesn't allow for manual marker placement and scene calibration that's simply why at times, well all ot of times, actually, it will be impossible to track game footage, even for simpler stuff like 2D corner pins. Using alternate tools might improve matters, of course, but naturally those cost extra money...

Mylenium