I’m using Gramps 5.1.5 on Ubuntu 22.04, and I’m trying to write a plugin that exports my family tree in a customised GEDCOM format. In particular, I’d like to, in addition to exporting the list of images for a person, also include the cropping information for each photo. I’ve written a plugin which subclasses exportgedcom.GedcomWriter and overrides the _media method, which is run once for each Media object. If I have a reference to a Media object, how can I find the MediaRef for that object which contains its cropping information? There doesn’t seem to be a very convenient way to do that, unless I’m missing something; I hope I’m missing something 
I’m pretty sure that you don’t want to be adding crop info to the _media, as a media can have more than one crop when used from more than one source. For example a media might be attached to a family, (with no crop) and to the various individuals with a crop for each.
I suggest modifying the _photo method. This is called each time a media is referenced (person, family, source, citation etc.) and already contains the photo parameter which is the MediaRef.
Then I assume you will be adding a new GEDCOM line at the level below OBJE with the crop info. I’ve seen this included with GEDCOM 7 (CROP tag) so I assume you will be doing it like this, except with _CROP, as 5.5.1 extensions should have an underscore.
Aha, thank you, that’s very useful! I’ll look into doing it that way. I’m likely to only be using my generated “gedcom + extras” internally, but it’s still good to know how to add undocumented extensions correctly, so I’ll do that too
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