Hello everyone, after a rough search in the forum I found entries in which the playback programs from Apple & Co have enriched metadata or fed it externally. In my case, however, I am firmly convinced that I have a whole set of M4A files that contain metadata that is not recognized by MP3Tag. Do y…

Mp3tag expects a four-character MP4 atom identifier consisting of printable ASCII characters, where the trailing null character 0x00 as found in the FourCC of the ilst → url atom is treated as invalid.

Please press Alt + T (View -> Extended Tags) on the same M4A-song loaded in Mp3tag and show us a screenshot .

WOW, thats fast... and here is the requested Screenshot. [MP3Tag2]

And now please two more screenshots of your File -> Options -> Tags -> Mpeg and File -> Options -> Tags -> Ape, Mpc to check what kind of tags you read into Mp3tag from your files.

Here we go [MP3Tag4] [MP3Tag5] [MP3Tag3] and as a goodie, you can see the strings in the File itself

Strange thing. Maybe you can check this file for errors with Foobar: [image] How to check files for errors? Howto It’s required and often helps to reduce support cycles to check files for errors before filing a bug report. Symptoms of erroneous files are ofte…

Sorry for the delay but lunch was ready :wink: File Integrity Checker show "not errors". But Foobar is also not able to show Metadata. [MP3Tag6] Due to copyright reasons I do not want to share the file here. I am looking for another file that I can share without hesitation and has the same prob…

[image] L3Enc: I am looking for another file that I can share without hesitation and has the same problem. That would help to identify the reason. As you see from the file content screenshot there are some metadata inside your file. The question is now if these are really m4a files or some …

MP3 Diag does not work... maybe because all files are M4A. Anyway, i have a copyright free file with the same error. You can download it here. http://e.pc.cd/QVmy6alK

Unfortunately I can't say for sure which tools are used to write the metadata. There are a lot of python scripts and libraries. I'll see if I can untangle this a bit.

[image] L3Enc: You can download it here. I can confirm that I cannot read the existing metadata either in Mp3tag. ExifTools shows a lot of metadata. The interesting part: [image] Unfortunately I can not tell you, what exactly is wrong with your current metdata.

MP3Tag does not recognize Covers and Metadata

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LyricsLover March 30, 2025, 3:28pm 6

Strange thing.

Maybe you can check this file for errors with Foobar:

Or - if possible - you could share such a song with us?