MKVToolNix 26.0.0

MKVToolNix is a set of tools to create, alter and inspect Matroska files under Linux, Mac, other Unices and Windows.

Freeware / Donate
15.1 MB
4.6 50 votes

With these tools one can get information about (mkvinfo) Matroska files, extract tracks/data from (mkvextract) Matroska files and create (mkvmerge) Matroska files from other media files. Matroska is a new multimedia file format aiming to become THE new container format for the future. You can find more information about it and its underlying technology, the Extensible Binary Meta Language (EBML), at

What's New:

New features and enhancements

  • mkvmerge: chapter generation: if the name template given by --generate-chapters-name-template is empty, no names (ChapterDisplay master elements with ChapterString/ChapterLanguage children) will be generated for the chapter atoms. Part of the implementation of #2275.
  • mkvmerge: chapters: chapter names generated from MPLS files will now use the name template if one is set via --generate-chapters-name-template. Part of the implementation of #2275.
  • mkvmerge: mkvmerge will no longer abort with an error message if no audio, video and subtitle tracks should be multiplexed. This allows copying of chapters from non-chapter source files (e.g. Matroska or MP4 files).
  • MKVToolNix GUI: the font size in the tool selector on the left will scale with the font size the user selects in the preferences.
  • MKVToolNix GUI: the GUI will no longer automatically resize the columns in tree and list views to match the content size. Instead it remembers and restores the widths set by the user. Implements #2353.
  • MKVToolNix GUI: multiplexer: the chapter name template will now be set automatically to the name template in the preferences’ "chapter editor" section. Additionally the option --generate-chapters-name-template … will be passed to mkvmerge in situations when mkvmerge will generate chapters (either because automatic generation is enabled or if chapters are generated for MPLS playlists). Part of the implementation of #2275.
  • MKVToolNix GUI: chapter editor: if the chapter name template is empty, chapters will be generated without names. Part of the implementation of #2275.
  • MKVToolNix GUI: chapter editor: added an option to remove all chapter names to the "additional modifications" dialog. Part of the implementation of #2275.

Bug fixes

  • mkvmerge: Matroska reader: fixed wrong timestamps when appending Matroska files where the second Matroska file’s first timestamp is bigger than 0. Fixes #2345.
  • mkvmerge: MP4 reader: fixed division by zero errors during file identification if the timescale is 0 in the MVHD atom.
  • mkvmerge: Windows Television DVR files are now recognized as an unsupported file type. This prevents mis-detection as MPEG-2 with an accompanying flood of error messages. Fixes #2347.
  • MKVToolNix GUI: info tool: under certain circumstances "cues" were shown at the wrong level (inside the previous master element instead of on level 1). Fixes #2361.
  • MKVToolNix GUI: job queue: fixed invalid memory handling and consequent crashes when using the "edit in corresponding tool & remove from job queue" option if one of the files in that job contained attached files. Fixes #2368.