If the camera is sitting on a tripod, there is no parallax movement. Therefore, the 3d Camera Tracker (which uses parallax movement to solve a shot) doesn’t really have the info to work with. That’s likely why you’re not getting good solves.
DEFINITELY go with Mocha AE (or even AE’s point tracker). They’re intended for this sort of thing. And, yes, transcoding to ProRes first is going to make everything go more smoothly in AE.
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