Renaming the "Catalog #" field, only on albums that have it

[Dimtiris_Stathis]

Hello guys. I am not sure if I am posting on the correct section of the forums, but here is the issue:

I started using Roon, but I am facing an issue.
So far, all my ripped CDs have been using the tag Catalog #.
As I understand, Roon uses the tag CATALOGNUMBER. So, I will need to replace the tag name.

THE PROBLEM
The way to make the above conversion massively (10.000 songs) is with MP3Tag. BUT, there are a few albums on my collection that don’t have a catalog number field. This means that when I try to rename the field, it gets deleted from everywhere because some albums don’t have it.
So, the way to proceed, is to have something like an action that contains a condition.

It should be: Rename Catalog # to CATALOGNUMBER if the field exists on the specific file. If not, do nothing.

Any ideas on how to do this?
Thanks in advance.

[Caveman]

I would try to copy the value from the existing catalog field (the one you use) to a new catalog field (used by Roon) using a “format value” action in mp3tag, when done you can delete the old one.

[tripleCrotchet (Tony)]

I use “Catalogue #” in mp3tag as well . But as far as I can see roon is interpreting this as LABELNO which I have always assumed it can use to match its metadata. Often I have BARCODE as well and maybe roon is ignoring Catalogue # and I never realised. Can @support confirm how roon will handle the local tag “Catalogue #”?

Edit: I have just realised I am using the UK form “Catalogue” rather than the US form “Catalog”. Does roon handle the cases differently?

[Mike_O_Neill]

Its easy in JRiver

Set up a view with a Rule [Catalog #] is not Empty
Create a Custom Tag CATALOGNUMBER
Then Move/Copy tool to move Catalog # to CATALOGNUMBER

In fact all you need to do is step 2 & 3

Far be it for me to suggest a 30 day demo of JRiver to do just this

JRiver is by far the most versatile Tag Editor in my Toolbox

[ged_hickman1]

There are If Then functions in mp3tag.

[tripleCrotchet (Tony)]

It is not clear to me that you need to do anything at all. If you go to one of your albums in roon that you know to have a “Catalog #” tag, check to see if roon has made a LABELNO tag:

album → (any track) → three dots → View file info → File tags

You may have to scroll down but do you see something like this?

[Dimtiris_Stathis]

Thanks guys for all your answers… All your suggestions could be selected as a solutions though and I really appreciate this.

This is what I did in mp3tag and it worked.

Cheers to you all and this awesome community!