Software update: MKVToolNix 39.0.0

Moritz Bunkus released version 39 of MKVToolNix. With this open source program, matroska files can be viewed, edited and converted. For example, soundtracks and subtitles can be added, removed or set as default. MKVToolNix is ​​a collection of separate command line tools, but a graphical user interface is also included. Downloads are available for Windows, various Linux distributions and macOS. The changelog for this release looks like this:

New features and enhancements

• mkvmerge: Blu-ray: when reading an MPLS playlist mkvmerge will look up and
  use chapter names from the Blu-ray’s “track / chapter names” meta data if it
  exists. Part of the implementation of 2486.
• mkvmerge: MP4 reader: if present, cover art images (the
  meta.udta.ilist.covr atom) will be converted into attachments.
• MKVToolNix GUI: multiplexer: when adding a playlist from a Blu-ray disc, the
  disc library meta data will be parsed, and the biggest thumbnail, if
  present, will be added as a new attachment with name cover.jpg (extension
  depends on thumbnail’s extension). Implements # 2644.
• MKVToolNix GUI: multiplexer: when adding a playlist from a Blu-ray disc, the
  title from the disc library meta data will be set as the new file title if
  the disc library meta data contains one & no title has been set yet.
• MKVToolNix GUI: multiplexer: the automatically generated destination file
  name will now be based on the file title if one is set at that point. This
  works in conjunction with the title being said from the Blu-ray disc library
  meta data.
• MKVToolNix GUI: chapter editor: when reading chapters from an MPLS playlist
  the GUI will look up and use chapter names from the Blu-ray’s “track / chapter
  names “meta data if it exists. Part of the implementation of 2486.
• MKVToolNix GUI: Windows: added a dark mode that’s enabled when Windows 10’s
  dark mode is turned on.
• translations: added a Bulgarian translation of the programs & the man pages
  by Симеон Цветков (see AUTHORS).

Bug fixes

• mkvmerge: attachments without a file name won’t be ignored anymore. Part of
  the fix of # 2642.
• MKVToolNix GUI: header editor: attachments with an empty name element will
  be shown as as originally intended. Part of the fix of # 2642.
• Linux AppImage: the AppImage will no longer change directories before
  running the desired executable allow the use of relative file names. Fixes
  # 2632.

Build system changes

• MKVToolNix now requires a C ++ compiler that supports the following features
  of the C ++ 17 standard: “[[maybe_unused]]attribute “,” nested namespace
  definition “,” structured bindings “. For the GNU Compiler Collection (gcc)
  this means v7 or newer; for clang it means v4 or newer.
• Boost 1.60.0 or newer is now required.