It’s possible to add global tags to mkv video file via mkvpropedit.
mkvpropedit "source-filename.mkv" --tags global:tagFilename.xml
But it doesn’t look like it’s possible to extract global tags in isolation from other track specific tags using mkvextract.
You can only extract them all.
mkvextract "source-filename.mkv" tags tagFilename.xml
I’m interested in using mkvextract in conjunction with mkvpropedit within PowerShell scripts to do automated batch file tag editing of some global tags.
It would be easier to manipulate the XML files extracted from mkvextract if they only contained global tags rather than also including track level ones.
Could I perhaps suggest the option of extracting just global tags as a feature request for consideration in some future release?