[kid3] [Bug 474098] New: kid3 deletes all audio content when saving M4A files!

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=474098

            Bug ID: 474098
           Summary: kid3 deletes all audio content when saving M4A files!
    Classification: Applications
           Product: kid3
           Version: 3.9.x
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: ufleisch at users.sourceforge.net
          Reporter: green-guy-kid3 at guerrillamail.com
  Target Milestone: ---

Created attachment 161368
  --> https://bugs.kde.org/attachment.cgi?id=161368&action=edit
Music downloaded from YouTube - the bug occurs with this file.

When I edit the tags of an MP4/M4A file that I downloaded from YouTube and save
them, all audio content gets stripped away!
It might be an issue with libmp4v2metadata.dylib

(By the way, why do you need an account here?!)

STEPS TO REPRODUCE
1. Open an MP4/M4A audio file
2. Make any changes in the "Tag 2: MP4" section
3. Press the Save button

OBSERVED RESULT
The file doesn't get corrupted, but the audio length becomes zero-duration and
the file size shrinks down to a few bytes to kilobytes, i. e. it will only
consist of the tags.

EXPECTED RESULT
MP4 tags are written and the audio is untouched.

SOFTWARE/OS VERSIONS
macOS Big Sur 11.6
Kid3 3.9.3
Qt Version: 5.15.2

ADDITIONAL INFORMATION
This bug did NOT happen a few months ago, when I last used kid3.

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