ffprobe: some .m4a files' metatags are not read by ffprobe

[Joao Bonina]

Summary of the bug:
How to reproduce:

% ffprobe Portugal.m4a
ffprobe version 0.11.2 Copyright (c) 2007-2012 the FFmpeg developers
  built on Oct 10 2012 18:26:07 with gcc 4.7.1

Running ffprobe on alac encoded files (.m4a), only returns the creation_date metadata. Album, artist, title, etc. are not returned.

The mp4v2 tool returns those correctly. Also, AtomicParsley and Mp3tag read the metadata correctly.

Here are the outputs of ffprobe and mp4v2:

configuration: --enable-libmp3lame --enable-libtheora --enable-libx264
--disable-libgsm --enable-postproc --disable-libxvid --enable-libfaac
--enable-pthreads --enable-libvorbis --enable-gpl --disable-x11grab
--enable-nonfree

libavutil 51. 54.100 / 51. 54.100
libavcodec 54. 23.100 / 54. 23.100
libavformat 54. 6.100 / 54. 6.100
libavdevice 54. 0.100 / 54. 0.100
libavfilter 2. 77.100 / 2. 77.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Portugal.m4a':

Metadata:

major_brand : M4A
minor_version : 0
compatible_brands: mp42isomM4A
creation_time : 2012-09-29 15:28:41

Duration: 00:01:28.80, start: 0.000000, bitrate: 608 kb/s

Stream #0:0(und): Audio: alac (alac / 0x63616C61), 44100 Hz, 2 channels, s16, 608 kb/s
Metadata:

creation_time : 2012-09-29 15:28:41

[FORMAT]
filename=Portugal.m4a
nb_streams=1
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime/MPEG-4/Motion JPEG 2000 format
start_time=0.000000
duration=88.800000
size=6756165
bit_rate=608663
TAG:major_brand=M4A
TAG:minor_version=0
TAG:compatible_brands=mp42isomM4A
TAG:creation_time=2012-09-29 15:28:41
FORMAT

mp4info version 2.0.0
Portugal.m4a:
ReadChildAtoms: "Portugal.m4a": In atom meta missing child atom hdlr
Track Type Info
1 audio alac, 88.800 secs, 608 kbps, 44100 Hz
ReadChildAtoms: "Portugal.m4a": In atom meta missing child atom hdlr

Name: Sonhei que estava em Portugal
Artist: Cristina Branco
Album: Ulisses
Track: 1 of 0
Genre: Fado

[Carl Eugen Hoyos]

Please test current git head and please provide the input sample.

[Joao Bonina]

Find the sample here: ​https://www.dropbox.com/s/qszd2142r5hcevj/01%20Sonhei%20que%20estava%20em%20Portugal.m4a

[Joao Bonina]

Output from git head, it still doesn't read tags correctly:

ffprobe version N-45459-g2a56e65 Copyright (c) 2007-2012 the FFmpeg developers
  built on Oct 13 2012 18:11:36 with gcc 4.7 (Debian 4.7.2-4)
  configuration: --enable-libmp3lame --enable-libtheora --enable-libx264 --disab           le-libgsm --enable-postproc --disable-libxvid --enable-libfaac --enable-pthreads            --enable-libvorbis --enable-gpl --disable-x11grab --enable-nonfree
  libavutil      51. 76.100 / 51. 76.100
  libavcodec     54. 65.100 / 54. 65.100
  libavformat    54. 32.100 / 54. 32.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 19.102 /  3. 19.102
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 16.100 /  0. 16.100
  libpostproc    52.  1.100 / 52.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '01 Sonhei que estava em Portugal.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 0
    compatible_brands: mp42isomM4A
    creation_time   : 1942-08-25 09:00:25
  Duration: 00:01:28.80, start: 0.000000, bitrate: 608 kb/s
    Stream #0:0(und): Audio: alac (alac / 0x63616C61), 44100 Hz, stereo, s16, 60           8 kb/s
    Metadata:
      creation_time   : 1942-08-25 09:00:25