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ffmpeg is standalone (100 MB executable!), just download the “right” version which includes v360 filter (i.e. at least 4.3 according to changelog).
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probably it can back-convert by using -vf v360:equirectangular:fisheye , but I didn’t try
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I am quite new on sharing projects on github, so I saved my Realbasic/Xojo project in XML/TXT format as I read somwehere, as it makes it is easier for contributors to understand/edit the project before importing in Realbasic.
edit:
I’ve just seen that the XML is all but readable! I’ll check if there is an ACTUAL text format for sharing.