Editing exif meta data corrupts MPO 3D image files
|Status:||Assigned||Start date:||30 Sep 2013|
When editing metadata (e.g. title, caption, gps-coordinates) of mpo (multi picture object) images, these images cannot be displayed by the original camera or applications like geeqie, anymore. The windows freeware (e.g. via wine) application stereophoto maker is able to restore them.
exiv2 version: 0.23-1
#4 Updated by Georg Eckert over 5 years ago
I think I might have found out what causes the problem:
MPO files contain MPF Exif Information.
The tag MPImageStart contains information where the second image in a MPO image begins. When adding a comment or GPS-Coordinates to a MPO image, the position of the second image changes and MPImageStart has to be updated. I think Exiv2 does not update this tag and therefore programs looking for a jpeg at the position provided by MPImageStart cannot find one.
#6 Updated by Georg Eckert over 5 years ago
it is not too urgent. I found a way to repair this as the problem is already known by the ExifTool Developers. But it definitely should be fixed - since it is a important matter. Have a look here - thats a description of the issue by the ExifTool developer: [[http://owl.phy.queensu.ca/~phil/exiftool/standards.html#MPF]]
Take your time and thank you for looking into this.
#7 Updated by Robin Mills over 5 years ago
- Status changed from New to Assigned
- Assignee set to Robin Mills
- Priority changed from High to Normal
- Target version changed from 0.24 to 0.25
Thanks. I'll deal with this after I finish with Google Summer of Code. I hope the fix will be in 0.25 which is slated for the end of 2013.
#12 Updated by Robin Mills over 2 years ago
- Target version changed from 0.26 to 0.28
I've put in around 1200 hours of unpaid work to get to code complete v0.26 and closed almost 200 issues. Regrettably, there are only 5 or 6 issues on which I have not been able to work. This is one. Deferred for v0.27.