# Loose track number and catalog ID after converting music **URL:** \ **Category:** Support\ **Created:** [March 15, 2019, 9:24am UTC](https://community.mp3tag.de/t/loose-track-number-and-catalog-id-after-converting-music/44854 "2019-03-15T09:24:20Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Leo](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c2a13f/32.png) [@Leo](https://community.mp3tag.de/u/Leo)\ **Post date:** [March 15, 2019, 9:24am UTC](https://community.mp3tag.de/t/loose-track-number-and-catalog-id-after-converting-music/44854/1 "2019-03-15T09:24:20Z")
Hello, I'm using MP3tag to tag my music. Typically I use the Discogs tag source functionality to fill all the need fields. When converting a music (I tried several converter) I loose track number and catalog ID information. Please see the picture (AIF to FLAC). ![46%20AM](https://community.mp3tag.de/uploads/default/original/2X/b/b6f894e29142ef9438d381fa7995c6b8b70de13d.jpeg) What should I do so the tags are fully preserved ? Thank you ---
**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\ **Post date:** [March 15, 2019, 9:34am UTC](https://community.mp3tag.de/t/loose-track-number-and-catalog-id-after-converting-music/44854/2 "2019-03-15T09:34:55Z")
It could be that you have to add a mapping for these fields: TRACK -\> TRACKNUMBER CATALOGID -\> LABEL See File\>Options\>Tags\>Mapping (in my installation there is already a mapping for TRACK: Tag: VorbisCOmment Source: TRACKNUMBER Target: TRACK ---
**Author:** ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)\ **Post date:** [March 15, 2019, 9:40am UTC](https://community.mp3tag.de/t/loose-track-number-and-catalog-id-after-converting-music/44854/3 "2019-03-15T09:40:04Z")
> [@Leo](#): > > What should I do so the tags are fully preserved ? You can also check if the converter you're using is actually writing those fields to the target FLAC file at all. You can see all fields that are in there via the extended tag dialog at Alt + T. If those fields are not present, you can select the source AIF file in the file list and press Ctrl + C to copy the tag to the clipboard. Then select the target FLAC file and Ctrl + V to paste the tag to the file. This also works with multiple files at once, their order must match. ---
**Author:** ![Leo](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c2a13f/32.png) [@Leo](https://community.mp3tag.de/u/Leo)\ **Post date:** [March 15, 2019, 10:34am UTC](https://community.mp3tag.de/t/loose-track-number-and-catalog-id-after-converting-music/44854/4 "2019-03-15T10:34:01Z")
I'm using XLD on Mac. Apparently it does not contain catalogID so that's probably the reason... Ideally I would like to find a converter that keeps literally all the tags I set with MP3Tag. Would you know one ? I'd like to avoid doing steps manually cause I have a lot to convert. ---
**Author:** ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)\ **Post date:** [March 15, 2019, 11:57am UTC](https://community.mp3tag.de/t/loose-track-number-and-catalog-id-after-converting-music/44854/5 "2019-03-15T11:57:30Z")
You could try [FFMPEG](https://www.ffmpeg.org/download.html). **But be warned** , there is no colorful GUI, just a plain command line. You have to use a command like `ffmpeg -y -i in.aiff out.flac` to convert your \*.aif files to \*.flac Sorry, I can't help you with problems occuring on a Mac. ---
**Author:** ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)\ **Post date:** [March 15, 2019, 3:05pm UTC](https://community.mp3tag.de/t/loose-track-number-and-catalog-id-after-converting-music/44854/6 "2019-03-15T15:05:14Z")
> [@Leo](#): > > Ideally I would like to find a converter that keeps literally all the tags I set with MP3Tag. Besides ffmpeg, you can also try [https://dbpoweramp.com/](https://dbpoweramp.com/). It's not free, but has a version for macOS. ---
**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\ **Post date:** [February 9, 2026, 12:27pm UTC](https://community.mp3tag.de/t/loose-track-number-and-catalog-id-after-converting-music/44854/7 "2026-02-09T12:27:59Z")