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[Bug]: comment tag is used instead of description tag to populate description metadata in the library m4b files #2537
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opened 2026-04-25 00:08:09 +02:00 by adam
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Reference: starred/audiobookshelf#2537
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Originally created by @DaAndaDepp on GitHub (Feb 3, 2025).
What happened?
After initially scanning the library folder for audiobooks, i noticed that the description metadata shown in the client was taken from the comment tags instead of the description tags. My library has both m4b and mp3, but i only care about the m4b files. The debuglevel logging shows nothing considering the parsing of the tags. I'm running the server on a synology nas (dsm 7.2) with docker. Here is ffprob & tone dump from one of the files:
--ffprobe--
--tone dump--
What did you expect to happen?
Well, that the description tag is used for descripitions.
Steps to reproduce the issue
Audiobookshelf version
v2.18.1
How are you running audiobookshelf?
Docker
What OS is your Audiobookshelf server hosted from?
Linux
If the issue is being seen in the UI, what browsers are you seeing the problem on?
Firefox
Logs
Additional Notes
No response
@DaAndaDepp commented on GitHub (Feb 3, 2025):
tried to edit the website-probe in, but the post is too long
--website-probe--
@sunn0 commented on GitHub (Feb 3, 2025):
How did you add the description metadata?
The details you provided show that the description is placed in the lyrics tag. And since the actual description tag is empty, the comment tag is used as a fallback.
@advplyr commented on GitHub (Feb 3, 2025):
Yeah there is no description tag set. The lyrics tag isn't used by Abs.
Let me know if you still think this is a bug
@DaAndaDepp commented on GitHub (Feb 3, 2025):
Tone shows both the lyrics and description tag (at the end), which i think is the unrecognized stream in ffprobe at the very end. I thought i read in some issue comments that u were using/moving from ffprobe to tone around 2023/24? Most m4b files are created with Libation and further edited with mp3tag and tone. The lyrics and description values differ frome one another. I think the lyrics tag is unedited by me, set by libation. The description tag i edited with mp3tag. Sorry if i got this mixed up, i guess if abs is not using tone it for sure is an issue with differnence in mp3tags and ffmpegs implementaion of tags of some sort.
Regards
@DaAndaDepp commented on GitHub (Feb 3, 2025):
So for anybody having similar issues: I checked out the "advanced tag-information" in mp3tag, and the "description tag" mp3tag uses in my case, is called UNSYNCEDLYRICS. Neither ffprobe or tone show UNSYNCEDLYRICS in its output. I also tried out exiftool, which shows a description, lyrics and comment tag. But the comment tag shows an old, abreviated version of the description tag i replaced with mp3tag. Abs shows the "newer" comment (as description). At this point i am a bit lost and am guessing that this is a mess of
tons of differnet "interpretation" for names and pointers in the filestructure
left old data from different metadata version (the differing comments?)