How to obtain camera extrinsic parameters for in-the-wild videos?

[itsnickchiu]

Hi Authors,

Thank you for your excellent work! I truly appreciate the effort and insights you have shared.

I have a question regarding the input data format. Specifically, I would like to understand how to obtain the camera extrinsic parameters (i.e., the 4×4 matrices for 77 frames) for the input video.

In particular, for in-the-wild videos, are these extrinsic parameters expected to be precomputed?
If so, would I need to estimate the camera extrinsics for a new input video myself, or is there a recommended approach or tool provided for this purpose?

Thank you very much for your time and assistance.

Best,
Nick