[FFmpeg-trac] #7240(undetermined:new): Preserve Vorbis Comment vendor string when copying streams

[FFmpeg]

#7240: Preserve Vorbis Comment vendor string when copying streams
-------------------------------------+-------------------------------------
             Reporter:  hdante       |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  minor
  undetermined                       |                  Version:
             Keywords:               |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
 Summary of the bug:
 Hello, by default ffmpeg does not preserve the vendor string in formats
 that use vorbis comment. Is is possible to do so ? Could it be implemented
 ?

 How to reproduce:
 {{{
 $ ffmpeg -i Best_of_the_Beast.flac -c copy ffmpeg.flac
 $ ffmpeg -i Best_of_the_Beast.opus -c copy ffmpeg.opus
 $ mediainfo Best_of_the_Beast.flac | grep library
 Writing library                          : libFLAC 1.3.2 (UTC 2017-01-01)
 $ mediainfo Best_of_the_Beast.opus | grep library
 Writing library                          : libopus 1.2.1
 $ mediainfo ffmpeg.flac | grep library
 Writing library                          : Lavf58.12.100
 $ mediainfo ffmpeg.opus | grep library
 Writing library                          : Lavf58.12.100

 ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
   built with gcc 8.1.0 (GCC)
   configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --enable-avresample --enable-fontconfig --enable-gmp --enable-
 gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray
 --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm
 --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-
 libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg
 --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex
 --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab
 --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264
 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid
 --enable-nvenc --enable-omx --enable-shared --enable-version3
   libavutil      56. 14.100 / 56. 14.100
   libavcodec     58. 18.100 / 58. 18.100
   libavformat    58. 12.100 / 58. 12.100
   libavdevice    58.  3.100 / 58.  3.100
   libavfilter     7. 16.100 /  7. 16.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  1.100 /  5.  1.100
   libswresample   3.  1.100 /  3.  1.100
   libpostproc    55.  1.100 / 55.  1.100


 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7240>
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