no id3 or apev2 metadata support for .tta audio files

[cyril]

Summary of the bug:
True Audio format supports metadata as being ID3v1, ID3v2 or APEv2. But ffprobe never detects any metadata nor cover art from .tta files while mp3tag v2.55a can write and read them without any issue.

How to reproduce:

% ffprobe.exe music.ape.tta
ffprobe version N-53758-g5711e4f Copyright (c) 2007-2013 the FFmpeg developers
  built on Jun  2 2013 02:33:52 with gcc 4.7.3 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
enable-libxvid --enable-zlib
  libavutil      52. 34.100 / 52. 34.100
  libavcodec     55. 13.100 / 55. 13.100
  libavformat    55.  8.102 / 55.  8.102
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 74.101 /  3. 74.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, tta, from 'music.ape.tta':
  Duration: 00:23:57.77, start: 0.000000, bitrate: 1054 kb/s
    Stream #0:0: Audio: tta, 44100 Hz, stereo, s16

% ffprobe.exe music.id3.tta
ffprobe version N-53758-g5711e4f Copyright (c) 2007-2013 the FFmpeg developers
  built on Jun  2 2013 02:33:52 with gcc 4.7.3 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
enable-libxvid --enable-zlib
  libavutil      52. 34.100 / 52. 34.100
  libavcodec     55. 13.100 / 55. 13.100
  libavformat    55.  8.102 / 55.  8.102
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 74.101 /  3. 74.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
[tta @ 000000000278eec0] Format tta detected only with low score of 24, misdetec
tion possible!
Input #0, tta, from 'music.id3.tta':
  Duration: 00:23:57.77, start: 0.000000, bitrate: 1048 kb/s
    Stream #0:0: Audio: tta, 44100 Hz, stereo, s16

[Elon Musk]

Id3v1 should be already supported.
Ape tags should be supported now.
For id3v2 file is not recognised as tta at all here.

[cyril]

id3v2 is a bit annoying to handle as its content is append at the beginning of a file, while id3v1 and apev2 are append at the end of a file.
So for ffmpeg to correctly recognize a file type, it should jump over id3v2 content before trying to detect actual file content.
This issue is probably why id3v2 is only really popular with mp3 files...

[Elon Musk]

Both id3v1 and id3v2 are appended at beginning of file, later one does not work.
This is unrelated bug, and report it to new ticket with actual file uploaded.