I can't help you much, but you are free to look at the source code, and
see whether you can see the formula from it:
https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/vf_lenscorrection.c
I did already try that, but there are no comments in the source code,
and it's really difficult to understand how it works. Reverse
engineering from the results seems easier for me.
Michael
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