Hi I am a new user of Mp3tag and I am trying to clean up the tag data on my digital music collection as they are not showing correctly on my Sonos app, especially compilation ablum with various artists. I have tried to correct the “Album Artist” to Various Artists in the field but I get an error m…

Thank you for the example files. I've analyzed them using foobar2000's Verify Integrity feature and, unfortunately, many of them are truncated and can, thus, not safely be tagged using Mp3tag. [Screenshot 2026-08-06 at 18.29.24]

[image] specops: The files are in a MP4 format Check if the files are real mp4 files, see e.g. about problems with MP4 files here: [image] Can't change details on Twitter videos Support 1 Download an .mp4 video from Twitter 2 In Windows Explorer (window…

In addition to @ohrenkino 's advice: You can confirm that you are using a genuine MP4 file and not a file with the wrong file extension (such as MP3, WMA or FLAC) by using a tool like MediaInfo , which can easily identify such files. THEN: Where do you try to change your MP4 file? Locally on your W…

I have tried on a USB drive and on a Qnap nas

What happens if the file is on a local/internal storage? What did Mediainfo tell? What was the result of the consistency check?

I don’t have the music stored internally on my windows laptop

The idea would be to copy it to the local storage and see what the result is - to rule out that any access rights might interfere.

ok I will copy an album that is not working and try to correct it locally, I have looked a bit deeper the codec field in the Mp3tag and currently it is MPEG-4 AAC (itunes 12.2.1.16) if that makes any sense.

I'd be interested if editing the file locally worked, and if not, which version of Mp3tag you're using on which system (your profile lists both Windows and macOS).

Hi Florian, I saved a copy of the album to my windows laptop and tried to edit the tags but when I tried to save the changes the processing return a message saying “Cannot write file” so I either have to skip the file or abort the operation.

I just sent you a private upload link via personal message. It would be most helpful if I could have a look at the file and analyze the issue.

MP4 file Tag editing not working

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ohrenkino August 5, 2026, 2:08pm 2

Check if the files are real mp4 files, see e.g. about problems with MP4 files here:

A check of the file's consistency would also help: