# \[F\] Disappearing "cdec" tag in Nero AAC
**URL:** https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052
**Category:** Fixed Bugs
**Tags:** bug-fixed
**Created:** [March 7, 2010, 2:23am UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052 "2010-03-07T02:23:43Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@matt\_t](https://community.mp3tag.de/u/matt_t)
#### Post date: [March 7, 2010, 2:23am UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/1 "2010-03-07T02:23:43Z")
Nero's AAC encoder writes a "cdec" tag with the settings used, e.g. "ndaudio 1.5.4.0 / -q 0.53 -lc". However editing any other tag in MP3Tag (I noticed it after adding album art) deletes the cdec tag, when it shouldn't.
BTW I'm using v2.45a
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### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [March 9, 2010, 6:15pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/2 "2010-03-09T18:15:30Z")
This should be preserved with the current [Development Build](http://developer.mp3tag.de).
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### Author:  [@matt\_t](https://community.mp3tag.de/u/matt_t)
#### Post date: [March 10, 2010, 1:49am UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/3 "2010-03-10T01:49:09Z")
Great, thanks.
Edit: Actually I tried 2.45d, and it still deletes the cdec tag. ☹
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### Author:  [@mrgou](https://community.mp3tag.de/u/mrgou)
#### Post date: [May 19, 2010, 7:24pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/4 "2010-05-19T19:24:03Z")
2.46a also deletes the tag. Additionally, it doesn't display it in View \> Tag. Are previous versions still available for download somewhere? This tag is important to me, and I don't want to risk and loose it.
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### Author:  [@Menedas](https://community.mp3tag.de/u/Menedas)
#### Post date: [July 17, 2011, 3:19pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/5 "2011-07-17T15:19:44Z")
And I wondered for a while why that information sometimes got lost. Thats a very annoying bug and that makes mp3tag currently nearly unusable for me. Why does it took so much time to change that? 😕
Is there a way to rewrite those cdec informations?
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### Author:  [@mjcm](https://community.mp3tag.de/u/mjcm)
#### Post date: [July 17, 2011, 9:48pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/6 "2011-07-17T21:48:51Z")
Menedas,
you are currently using version 451 (see your personal Information), it would be nice to hear what happens with the current Build version 2.49.
As the OP is about the AAC Encoder, this is from the changelog from 2.49
[2011-05-15] NEW: added support for preserving unknown MP4 atoms when writing tags.
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### Author:  [@Menedas](https://community.mp3tag.de/u/Menedas)
#### Post date: [July 21, 2011, 5:15am UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/7 "2011-07-21T05:15:01Z")
No, I have tried it with the current 2.49.
EDIT: My personal informations said "Mp3tag Version: No Information". No idea where you get your information that I'm using 451.
And is there an answer on that:
Is there a way to rewrite those cdec informations?
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### Author:  [@mjcm](https://community.mp3tag.de/u/mjcm)
#### Post date: [July 21, 2011, 11:10am UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/8 "2011-07-21T11:10:09Z")
> [@Menedas](#):
>
> EDIT: My personal informations said "Mp3tag Version: No Information". No idea where you get your information that I'm using 451.
Sorry my mistake. Misread the info
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### Author:  [@Menedas](https://community.mp3tag.de/u/Menedas)
#### Post date: [August 2, 2011, 3:54pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/9 "2011-08-02T15:54:39Z")
So, whats next?
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [August 2, 2011, 5:52pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/10 "2011-08-02T17:52:24Z")
> [@Menedas](#):
>
> And is there an answer on that:
> Is there a way to rewrite those cdec informations?
It should be possible by writing a field with the name _cdec_. To make the field be written in lower case you'll need to use an action:
_Action type:_ **Guess values**
_Source format:_ **The encoding info**
_Guessing pattern:_ **%cdec%**
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### Author:  [@Menedas](https://community.mp3tag.de/u/Menedas)
#### Post date: [August 2, 2011, 6:20pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/11 "2011-08-02T18:20:13Z")
That works. Great 🙂
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### Author:  [@Menedas](https://community.mp3tag.de/u/Menedas)
#### Post date: [January 6, 2012, 11:21am UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/12 "2012-01-06T11:21:46Z")
Is there a schedule when this bug will be solved? Because its still a bit annoying to always rewrite the tags manually after using mp3tag.
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### Author:  [@Menedas](https://community.mp3tag.de/u/Menedas)
#### Post date: [January 21, 2012, 5:23pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/13 "2012-01-21T17:23:55Z")
I have tested the new Version 2.49b which should solve the problem, but the problem is still exists. Strange. That was the second or third try to get rid of it. Seems more complicated.
Maybe neroaacenc is saving his tags data in a different way.
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [January 21, 2012, 8:23pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/14 "2012-01-21T20:23:47Z")
I have no information that 2.49b is supposed to solve the problem, sorry.
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### Author:  [@Menedas](https://community.mp3tag.de/u/Menedas)
#### Post date: [January 21, 2012, 8:37pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/15 "2012-01-21T20:37:21Z")
It said "FIX: cpil atoms (compilation at MP4) set to 00 were not displayed."
I thought that could be my mentioned problem.
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [January 21, 2012, 8:59pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/16 "2012-01-21T20:59:09Z")
No, that was a different issue.
Can you tell me how you use the nero encoder? (from cmd line or with some program)
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### Author:  [@Menedas](https://community.mp3tag.de/u/Menedas)
#### Post date: [January 21, 2012, 9:05pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/17 "2012-01-21T21:05:50Z")
I'm using foobar2000 and neroaacenc 1.5.1 with those parameters:
-q 0.50 -ignorelength -if - -of %d
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### Author:  [@gerhard.menschick](https://community.mp3tag.de/u/gerhard.menschick)
#### Post date: [December 1, 2014, 3:13pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/18 "2014-12-01T15:13:59Z")
The problem that tag "cdec" gets lost is still the case.
The tag gets losts when I do tag changes via mp3tag.
I am on v2.65a
This is a real pitty as mp3tag is one of my master tools and on the other side I do not want to loose the encoding info within cdec.
1. Question
Is it agreed that this is an mp3tag bug? and will there ever be a fix?
2. Question
Is there any known workaround?
As dano proposed on Aug 2nd, 2011 a workaround? If yes, pls can anybody explain to me.
3. Question
If there is no fix nor workaround available, I am wondering to move from neroaac to qaac.
Is my understanding correct that mp3tag is anyhow more focused on Apple's implementations as I found on mp3tag homepage ("...support for iTunes-specific tags ...")?
Perhaps Nero's aac implementation will anyhow sooner or later dispear. There was no update / development for many years.
Finally, I want to draw your attentation to these tools:
[https://mediaarea.net/de/MediaInfo](https://mediaarea.net/de/MediaInfo)
[https://github.com/lordmulder/mediainfo-gui...eases/tag/v2.13](https://github.com/lordmulder/mediainfo-gui/releases/tag/v2.13)
Excellent tools to analyze which tags are really availble in a file.
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### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [December 13, 2014, 12:02pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/19 "2014-12-13T12:02:44Z")
The "cdec" field should now be preserved using the latest version Mp3tag v2.66.
Kind regards
Florian
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### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [December 28, 2018, 2:04pm UTC](https://community.mp3tag.de/t/f-disappearing-cdec-tag-in-nero-aac/10052/20 "2018-12-28T14:04:40Z")
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