Long Processing Time for 10GB+ files

[CoronavirusQuarantine]

Dear all,

Thank you for this great tool. Hope whoever reading this is safe amid the coronavirus quarantine.

Background
- I upload all my videos to Google Photos, which has a maximum file limit of 10GB.
- Thus, I had to split videos (4K). I do so with the free utility MP4Tools, which does not retain metadata.
- For Google Photos to sort the videos correctly, I hoped to just copy and paste the metadata, particularly the date/time of the videos.
- I therefore came across ExifTool.

Issue
- However, by default the entire file is rewritten, which takes a long time given (i) the file size (10GB) and (ii) the disk speed (5,400 rpm).
- (With my very limited tech knowledge) I have failed to find any option in exiftool to simply change the date without rewriting or overwriting the whole file, just as I could manually do so.

Some Thoughts
- It seems that this is the way the tool is designed to work: https://exiftool.org/forum/index.php?topic=7397.0.
- Given that the split videos themselves were simply generated, there is no risk involved.

Thanks very much!

[StarGeek]

- It seems that this is the way the tool is designed to work: https://exiftool.org/forum/index.php?topic=7397.0.

This is correct.  Exiftool has to re-write the entire file to make a change.