exiftool -ext MOV '-filenameMOV files and rename the image files with. # Video files require a different, so we run exiftool 3 times: This is based upon Exiftool FAQ 5 which says 'ExifTool is very flexible about the actual format of input date/time values when writing, and will attempt to reformat any values into the standard format unless the -n option is used. # Files shot within the same second get copy number added (-1,-2, etc.).