The GoPro software does not handle MP4. So another software is needed.
Here is an excellent video on using Adobe AfterEffects to get the fisheye out:
https://www.youtube.com/watch?v=stmzNSCRI_M
Here is an excellent video on using Adobe AfterEffects to get the fisheye out:
https://www.youtube.com/watch?v=stmzNSCRI_M