Q: REPAIR MP4 FILE - had some power failure on Helmet Cam result some file are shown as MP4 but cannot be played.

Hi I need to know if its possible to repair or some how run a MP4 file recorded on a Contour HD+ Helment Cam, on rough ground the battery connect was loose and result the camera created a few MP4 files which cannot be played, there is content there as the file are large files of variuos lenght which indicated that the file was fine and recording until a power blip cause the file to close and a new file to start. I tired to import into IMovie to see if this would run the file but no joy.