[FFmpeg-trac] #3969(undetermined:new): Incorect mapping of tags during m4a -> mp3 transcoding

[FFmpeg]

#3969: Incorect mapping of tags during m4a -> mp3 transcoding
-------------------------------------+-------------------------------------
             Reporter:  ra666ack     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 During a m4a -> mp3 transcoding the AAC 'date atom' (release year) is
 incorrectly mapped to the mp3 ID3 tag. Instead of 'TYER' for ID3v3.2 and
 'TDRC' for ID3v3.4 'TDRL' is used. As a result the year information is
 lost during transcoding.

 (It seems to be a similar behavior as described in the ticket #3694)

 {{{
 % ffmpeg -i input.m4a -codec:v copy -codec:a libmp3lame -q:a 2 output.mp3
 ffmpeg version 2.3.git
 built on Ubuntu 4.8.2-19ubuntu1
 }}}


 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '03 Into the Black Light.m4a':
   Metadata:
     major_brand     : M4A
     minor_version   : 512
     compatible_brands: isomiso2
     title           : Into the Black Light
     artist          : Ghost Brigade
     album           : Isolation Songs
     genre           : Melodic Death Metal
     track           : 3/11
     date            : 2009
     encoder         : FDK AAC encoder
     album_artist    : Ghost Brigade
   Duration: 00:05:27.98, start: 0.046444, bitrate: 207 kb/s
     Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo,
 fltp, 204 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
     Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg), 600x597 [SAR 1:1 DAR
 200:199], 90k tbr, 90k tbn, 90k tbc
 Output #0, mp3, to '03 Into the Black Light.mp3':
   Metadata:
     major_brand     : M4A
     minor_version   : 512
     compatible_brands: isomiso2
     TIT2            : Into the Black Light
     TPE1            : Ghost Brigade
     TALB            : Isolation Songs
     TCON            : Melodic Death Metal
     TRCK            : 3/11
     TDRL            : 2009
     TPE2            : Ghost Brigade
     TSSE            : Lavf56.4.101
     Stream #0:0: Video: mjpeg, yuvj420p, 600x597 [SAR 1:1 DAR 200:199],
 q=2-31, 90k tbn, 90k tbc
     Stream #0:1(und): Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp
 (default)
     Metadata:
       handler_name    : SoundHandler
       encoder         : Lavc56.1.100 libmp3lame
 Stream mapping:
   Stream #0:1 -> #0:0 (copy)
   Stream #0:0 -> #0:1 (aac (native) -> mp3 (libmp3lame))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.1 q=-1.0 Lsize=    8012kB time=00:05:28.02 bitrate=
 200.1kbits/s
 video:69kB audio:7942kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.006302%
 ffmpeg version 2.3.git Copyright (c) 2000-2014 the FFmpeg developers
   built on Sep  9 2014 21:20:40 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
   configuration: --prefix=/home/------/ffmpeg_build --extra-
 cflags=-I/home/------/ffmpeg_build/include --extra-
 ldflags=-L/home/------/ffmpeg_build/lib --bindir=/home/------/bin
 --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
   libavutil      54.  7.100 / 54.  7.100
   libavcodec     56.  1.100 / 56.  1.100
   libavformat    56.  4.101 / 56.  4.101
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  1.100 /  5.  1.100
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  0.100 / 53.  0.100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x1f65c20] stream 0, timescale not set

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3969>
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