I am currently working to a software which allows converting a fisheye image into an equirectangular one, for viewing in VR viewers.
Currently it works only with single fishey images with 235° FOV, but I plan to extend it to double fisheye and custom FOV.
In the meantime, if somebody withmore spare time than me wants to fork the project, its’ here:
It’s written in RealBasic (now “Xojo”) for Windows, but probably it can be also compiled fo other platforms (Lunx, Mac,…).
A pre-compiled windows binary is in the Fisheye2Equi folder (but you must download the whole package because you also need some included libraries).
It makes use of FFMPEG and its new filter “V360”; as you can see, program also displays the full commandline it generates, so you can experiment with it.
Don’t forget to put a copy of FFMPEG into program folder.
Program is not very robust yet, so you will easy crash it if you do “strange things”…