[FFmpeg-user] .m4a metadata

[Joao Bonina]

----- Original Message -----
> From: Joao Bonina <bonina_2001 at yahoo.com>
> To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
> Cc: 
> Sent: Friday, 12 October 2012, 15:11
> Subject: Re: [FFmpeg-user] .m4a metadata
> 
>> ________________________________
>>  From: Joao Bonina <bonina_2001 at yahoo.com>
>> To: FFmpeg user questions <ffmpeg-user at ffmpeg.org> 
>> Sent: Thursday, 11 October 2012, 18:19
>> Subject: Re: [FFmpeg-user] .m4a metadata
>> 
>>> ________________________________
>>>  From: Lou <lou at lrcd.com>
>>> To: ffmpeg-user at ffmpeg.org 
>>> Sent: Thursday, 11 October 2012, 18:10
>>> Subject: Re: [FFmpeg-user] .m4a metadata
>>> 
>>> On Thu, 11 Oct 2012 05:23:28 -0700 (PDT)
>>> Joao Bonina <bonina_2001 at yahoo.com> wrote:
>>> 
>>>>  Hi,
>>>> 
>>>>  I'm using ffmpeg on Linux as a decoder for .m4a files. They 
>>>>  play fine, but metadata doesn't seem to be read. It only reads 
> the 
>>>>  creation_time data.
>>>> 
>>>>  Can anyone help, please?
>>>> 
>>>>  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
>>>>   
>>>>   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]
>>> 
>>> What metadata are you expecting? Did you use ffmpeg to add the
>>> metadata? If yes, also include the actual command(s).
>> 
>> Metadata wasn't added with ffmeg. 
>> 
>> mp4Info shows the following, and was expecting also this from ffmpeg:
>> 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
>> 
> 
> 
> 
> So, am I seeing this right?



So, continueing my monologue.... :)

I inserted metatags with ffmpeg, and now it can access them.

Also, mp4v2 returns this:
mp4info version 2.0.0
out2.m4a:
Track   Type    Info
1       audio   alac, 88.800 secs, 608 kbps, 44100 Hz
 Name: Sonhei que estava em Portugal
 Artist: Cristina Branco
 Encoded with: Lavf54.6.100

So, no more " In atom meta missing child atom hdlr" messages there....

Strange, though. Shouldn't ffmpeg be able to read the tags that were created with jriver and with mp3tag?