[FFmpeg-trac] #5010(undetermined:new): Capitalization not preserved in map_metadata

[FFmpeg]

#5010: Capitalization not preserved in map_metadata
-------------------------------------+-------------------------------------
             Reporter:  darkfeline   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 Capitalization is not preserved on map_metadata, at least for MP3 to
 Vorbis/OGG.

 How to reproduce:

 Take an MP3 file with the following tag:
 {{{
 MusicBrainz Work Id
 }}}

 Convert it:

 {{{
 $ ffmepg -i input.mp3 -acodec libvorbis -map_metadata:s:a 0:s:a output.ogg
 }}}

 Metadata tag on output file loses capitalization:

 {{{
 musicbrainz work id
 }}}

 Only metadata keys are affected, not metadata value.

 "Standard" metadata keys like Title and Artist are not affected.

 {{{
 $ ffmpeg -version
 ffmpeg version 2.8.2 Copyright (c) 2000-2015 the FFmpeg developers
 built with gcc 5.2.0 (GCC)
 configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --enable-avisynth --enable-avresample --enable-fontconfig
 --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-
 libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm
 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb
 --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-
 libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex
 --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab
 --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264
 --enable-libx265 --enable-libxvid --enable-shared --enable-version3
 --enable-x11grab
 libavutil      54. 31.100 / 54. 31.100
 libavcodec     56. 60.100 / 56. 60.100
 libavformat    56. 40.101 / 56. 40.101
 libavdevice    56.  4.100 / 56.  4.100
 libavfilter     5. 40.101 /  5. 40.101
 libavresample   2.  1.  0 /  2.  1.  0
 libswscale      3.  1.101 /  3.  1.101
 libswresample   1.  2.101 /  1.  2.101
 libpostproc    53.  3.100 / 53.  3.100
 }}}

 (Apologies, not development branch, I can't build at the moment, will
 check again on master when I am able).

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5010>
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