[Bug 1758537] [NEW] mid3v2 mangles data before adding to ID3v2 tags

[Moses Moore]

Public bug reported:

I can't add frame 'WXXX' to mp3 files; mid3v2 changes the frame name
and the frame value before writing to disk.

What I did:

    $ mid3v2 --list-raw example.mp3
    Raw IDv2 tag info for example.mp3
    TDRC(encoding=<Encoding.LATIN1: 0>, text=[u'2018'])
    TALB(encoding=<Encoding.LATIN1: 0>, text=[u'albumname'])
    TPE1(encoding=<Encoding.LATIN1: 0>, text=[u'artistname'])
    TIT2(encoding=<Encoding.LATIN1: 0>, text=[u'songtitle'])
    $ mid3v2 -h
    ...
    You can set the value for any ID3v2 frame by using '--' and then a frame ID.
    For example:
        mid3v2 --TIT3 "Monkey!" file.mp3
    ...
    $ mid3v2 --WXXX "http://ubuntu.com/" example.mp3

What I expected:

    $ mid3v2 --list-raw example.mp3
    WXXX(encoding=<Encoding.????: ?>, text=[u'http://ubuntu.com/'])
    or
    WXXX(encoding=<Encoding.????: ?>, url=u'http://ubuntu.com/')

What I saw:

    $ mid3v2 --list-raw example.mp3
    WXXX(encoding=<Encoding.UTF8: 3>, desc=u'', url=u"[u'http://ubuntu.com/']")

When I use mutagen itself to read that frame I get:

    >>> import mutagen
    >>> f = mutagen.File('example.mp3')
    >>> f.tags['WXXX']
    KeyError: 'WXXX'
    >>> f.tags['WXXX:']
    WXXX(encoding=<Encoding.UTF8: 3>, desc='', url="[u'http://ubuntu.com/']")
    >>> str(f.tags['WXXX:'])
    "[u'http://ubuntu.com/']"

I said "WXXX" not "WXXX:", and the value that mid3v2 stored was a string
of a one-item list of the actual string I told it to store.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: python-mutagen 1.38-1
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Mar 24 10:42:08 2018
Dependencies:
 
InstallationDate: Installed on 2016-06-05 (657 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: mutagen
UpgradeStatus: Upgraded to artful on 2017-10-22 (153 days ago)

** Affects: mutagen (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1758537

Title:
  mid3v2 mangles data before adding to ID3v2 tags

Status in mutagen package in Ubuntu:
  New

Bug description:
  I can't add frame 'WXXX' to mp3 files; mid3v2 changes the frame name
  and the frame value before writing to disk.

  What I did:

      $ mid3v2 --list-raw example.mp3
      Raw IDv2 tag info for example.mp3
      TDRC(encoding=<Encoding.LATIN1: 0>, text=[u'2018'])
      TALB(encoding=<Encoding.LATIN1: 0>, text=[u'albumname'])
      TPE1(encoding=<Encoding.LATIN1: 0>, text=[u'artistname'])
      TIT2(encoding=<Encoding.LATIN1: 0>, text=[u'songtitle'])
      $ mid3v2 -h
      ...
      You can set the value for any ID3v2 frame by using '--' and then a frame ID.
      For example:
          mid3v2 --TIT3 "Monkey!" file.mp3
      ...
      $ mid3v2 --WXXX "http://ubuntu.com/" example.mp3

  What I expected:

      $ mid3v2 --list-raw example.mp3
      WXXX(encoding=<Encoding.????: ?>, text=[u'http://ubuntu.com/'])
      or
      WXXX(encoding=<Encoding.????: ?>, url=u'http://ubuntu.com/')

  What I saw:

      $ mid3v2 --list-raw example.mp3
      WXXX(encoding=<Encoding.UTF8: 3>, desc=u'', url=u"[u'http://ubuntu.com/']")

  When I use mutagen itself to read that frame I get:

      >>> import mutagen
      >>> f = mutagen.File('example.mp3')
      >>> f.tags['WXXX']
      KeyError: 'WXXX'
      >>> f.tags['WXXX:']
      WXXX(encoding=<Encoding.UTF8: 3>, desc='', url="[u'http://ubuntu.com/']")
      >>> str(f.tags['WXXX:'])
      "[u'http://ubuntu.com/']"

  I said "WXXX" not "WXXX:", and the value that mid3v2 stored was a string
  of a one-item list of the actual string I told it to store.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: python-mutagen 1.38-1
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Uname: Linux 4.13.0-25-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Mar 24 10:42:08 2018
  Dependencies:
   
  InstallationDate: Installed on 2016-06-05 (657 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: mutagen
  UpgradeStatus: Upgraded to artful on 2017-10-22 (153 days ago)

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