In the interim until it has been incorporated into Picard, I’ve put together a plugin that (hopefully) provides the information that you can use to meet your needs. Details follow:
Label Variables [ Download ]
This plugin reads the release metadata provided to Picard and exposes the label information in a number of additional variables for use in Picard scripts.
NOTE: This plugin makes no additional calls to the MusicBrainz website api for the information.
Label Variables:
- _label_ids_multi - All label IDs listed, as a multi-value
- _label_names_multi - All label names listed, as a multi-value
- _label_sort_names_multi - All label names listed (sort name), as a multi-value
- _label_disambig_multi - All label disambiguations listed, as a multi-value
- _label_catalog_multi - All label catalog numbers listed, as a multi-value
- _label_label_count - Count of the number of labels listed
- _label_catalog_count - Count of all catalog numbers listed
NOTE: Variables will not be created if the data is missing.