So to update the filesystem date to match the metadata CreateDate I used this command: > exiftool "-CreateDate>FileModifyDate" MyVideo.mp4 ModifyDate : 2013:09:14 00:52:38įrom the above the CreateDate & ModifyDate are the internal meta data, and the FileModifyDate etc are the filesystem. I found the ExifTool FAQ #24 which shows how to query for the times: > exiftool -time:all -a -G0:1 -s MyVideo.mp4 The first trick is to figure out what the "tags" are for the internal metadata and the file system. The biggest challenge was that most of the documentation was on how to modify the internal meta data, but I wanted to "copy" from the meta data to the filesystem timestamps.
By using the ExifTool cmd-line tool I was able to change them all at once. Using the ExifToolGUI I could fix them one at a time. 3gpp video files whose file "create" and "last modified" filesystem dates did not match the meta data inside of the file, and this was causing problems because many apps use the filesystem dates when sorting video files (rather than using the metadata inside the video files).
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