unrecognised tta file with id3v2 tags at begining

[cyril]

Summary of the bug:
True Audio format supports metadata as being ID3v1, ID3v2 or APEv2.
But ffprobe doesn't detect any id3v2 metadata on the following file: ​http://towerofbabel.free.fr/test/music.id3.tta while mp3tag v2.55a can see that a cover art is embedded as id3v2.3.

How to reproduce:

% 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 @ 00000000026cf6c0] 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]

File is not detected as tta1 at all and decodes nothing useful.

[Michael Niedermayer]

the complete demuxing failure is a regression since 55121f3fa92901a1917f035df534e8caa82e4f71

[Michael Niedermayer]

detection failure without .tta extension is caused by PROBE_BUF_MAX being too small

[cyril]

Maybe it would be more efficient when detecting ID3v2 tag to jump over ID3v2 content before starting the actual detection procedure. As ID3v2 tag are put before actual file content, it just add useless gibberish for the detection procedure.

[Carl Eugen Hoyos]

Fixed by Paul B Mahol in 369684f.