I just did this for all of my older videos and I would like to show my experience with you. This is an instruction for Mac only.
I would recommend to try one video first before batch converting all.
- Download and install Handbrake Batch (https://osomac.com/apps/osx/handbrake-batch/). It is a tool based on the popular conversion app Handbrake which does have some additional features.
- In the settings select "Keep original file Creation and Modification dates"
- Batch convert your video(s) to MP4 with one of the Handbrake default settings (I would recommend "High Profile")
- Now you have your video(s) as MP4 with the original creation dates. But you are not done yet. Monument is not looking at the file dates but at the metadata, which in my case still was empty. You can check your video now for example here: http://exif.regex.info/exif.cgi
- If the EXIF doesn't contain a Creation Date yet, continue by installing the app CM Batch MMedia Date Changer (https://itunes.apple.com/de/app/cm-batch-mmedia-date-changer/id1105847050?mt=12)
- Load your video(s) there and look at the metadata preview. With the standard settings it already populates the EXIF Creation Date field with the file creation date. Hit "Change Now" to start the process
- Check the metadata of your video again (http://exif.regex.info/exif.cgi). It should now contain the EXIF Creation Date
- Upload video(s) to Monument
- Check the date shown on the video in Monument
Enjoy and let me know if you are running into any kind of problems. :)
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