Advice on Embedding Ratings into Tags

[simoncn]

I have checked this in Mp3tag.

The iTunes Grouping tag was originally written to the standard ID3v2 frame TIT1 and MinimServer is mapping TIT1 to ContentGroup.

More recently, iTunes has created a nonstandard ID3v2 frame GRP1 and is now writing Grouping information to GRP1. MinimServer does not support the nonstandard GRP1 frame.

Mp3tag shows GRP1 as Grouping and this is what you are seeing in the screenshot you posted. Mp3tag shows TIT1 as ContentGroup.

As a workaround, you could copy Grouping information to Comment (the Mp3tag frame COMM) unless you are using Comment for some other purpose. MinimServer supports the COMM frame and maps this to the Comment tag.