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.

Thank you very much for your support, but what other options do we have? I mean, some tools can obviously read the data without any problems, but Mp3Tag and foobar, for example, have their problems with it. This proves neither a “bug” in the reading nor in the metadata writing tools. I think it ne…

[image] L3Enc: I think it needs a developer who is really familiar with the file formats and can debug their own routines and compare them with the standard. That and you should investigate your "... lot of python scripts and libraries."

Mediainfo shows the tag content. When you write any tagfield with Mp3tag, Mediainfo does not show the content anymore, only the just written tagfield.

@poster You are right about Mediainfo General Complete name : C:\Temp\Royalty Free Music - 3, 2, 1 Funky Pop Hip Hop Rock Break Beat Loops.m4a Format : MPEG-4 Format profile : Base Media / Version 2 Codec ID …

That sounds plausible. If Mp3Tag does not recognize anything when reading, then it will delete everything it identifies as invalid or unknown when writing. But I've also had it the other way around.... If I edit and save the metadata with another tool, it is sometimes (completely) visible to Mp3Tag…

[image] L3Enc: 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. Can you advise which program was o…

[image] L3Enc: I think it needs a developer who is really familiar with the file formats and can debug their own routines and compare them with the standard. Good luck on finding one, especially since some of the tags in your screen shot are proprietary. Perhaps you should contact the collec…

Unfortunately not with certainty. There are some files in my collection that have this error, but they have been lying more or less untouched on the disk for many years. I've only just realized that the tags on some of them are broken. But I started ripping my first discs maybe 30 years ago and have…

With a simple exiftool -r -overwrite_original -all= -tagsfromfile @ -all:all %DIR% I can fix the files so that most of the important metadata is rewritten. Then they can also be used in MP3Tag. Even if not all tags are copied, that's enough for now. Maybe this will help the next reader. If anyo…

[image] L3Enc: With which arguments did you call EXIFTool to get the output as in the screenshot? exiftool.exe -G7 -u "Royalty Free Music - 3, 2, 1 Funky Pop Hip Hop Rock Break Beat Loops.m4a"

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MP3Tag does not recognize Covers and Metadata

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