Fixing corrupted MP4 files

I'll freely admit to being a complete novice when it comes to video files - which may be obvious with the question...

At a track day I did recently, the Atom I was driving had an video to record it, but I was told the file was corrupted when it was checked after the drive.

I was recommended to use DivFix to repair it, but that only seems to be for AVI files and this one is an MP4...

So question really is - is there anything similar that may rescue an MP4 file?

Thanks all
Simon

You *may* get something from Avidemux, but I don't know if it's available for windows or it's just a Linux program.