MKVToolNix v72.0.0 “Minuano (Six-eight)”

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



Release Date


SHA-256 checksum file*


Official Download

MKVToolNix Logo

Alternative Download (Windows x64 Installer)

OneDrive Download

For additional platforms please visit

# Version 72.0.0 "Minuano (Six-eight)" 2022-11-13

## New features and enhancements

* mkvmerge: AV1 parser: the variable-width OBU size field will be re-written
  with minimal length if it's encoded longer than necessary.
* mkvmerge: when splitting is active the program will output the timestamps
  actually used for making the decision when to split. If GUI mode is active,
  a specially formatted line `#GUI#splitting_before_timestamp <timestamp>` is
  output as well. Lines prefixed with`#GUI#` are suitable for machine parsing,
  won't be translated and are guaranteed not to change in format. Implements
* MKVToolNix GUI: multiplexer: when dragging & dropping directories to the
  "attachments" tab, the files contained in those directories will be
  attached. Implements #3410.
* MKVToolNix GUI: info tool: added information about the file (directory,
  size, modification timestamp) at the top of each tab. Implements #3407.

## Bug fixes

* mkvmerge: AV1 parser: fixed the parser completely aborting when parsing the
  OBU size field fails due to there not being enough data to parse. Instead
  the parser will remember the last known-good position & restart from there
  after more data is available. Fixes #3431.
* mkvmerge: HDMV PGS subtitles: reverted the change that implemented a
  heuristic for detecting bogus timestamps & attempting to fix them. This was
  done to fix #3268. Unfortunately this affected valid subtitle files with
  intentional huge gaps in timestamps, e.g. forced subtitle tracks. The
  heuristic has simply been removed, fixing #3392.
* mkvmerge: Matroska reader: fixed reading files with EBML Void elements
  before the Matroska Segment element.
* mkvmerge: fixed reversed attachment selection: `--attachments !4` would not
  copy any attachment instead of all attachments but the one with ID 4. Fixes
* mkvextract: IETF BCP 47/RFC 5646 language tags: mkvextract will now use &
  prefer IETF BCP 47 track language elements if they're present. Only affects
  the VobSub & USF subtitle extraction.
* mkvpropedit, MKVToolNix GUI's chapter & header editors: updated the list of
  deprecated Matroska elements. The applications will no longer try to write
  those elements, even if they're found in the file to be modified. The
  programs will no longer abort with error messages such as `assertion "false"
  failed`. Fixes #3416.
* mkvpropedit, MKVToolNix GUI's chapter & header editors: when the Matroska
  version numbers stored in the EBML Head element are updated, the updated
  EBML Head element might be smaller than the existing one. In that case the
  programs used to shrink the EBML Head & write a small EBML Void element
  between the updated EBML Head & the following element, usually a Matroska
  Segment element. This isn't widely supported by programs including
  MKVToolNix itself, causing them to declare such files as invalid. The
  programs will now create the EBML Void element inside the EBML Head element,
  making them a level 1 element instead of a level 0 element. Fixes #3355.
* mkvpropedit, MKVToolNix GUI's chapter & header editors: often the programs
  have to relocate the Master elements in which the modifications were
  done. In that case the Seek Head elements must also be updated to reflect to
  the Master elements' new positions. If a file contained a Seek Head element
  at the start already and if that Seek Head was too small to contain the
  updated positions, the programs would end up in an endless loop trying to
  write data to the end, creating ever-growing files. This is now handled
  properly by voiding this too-small Seek Head & finding a proper space for a
  new one instead. Fixes #3338.
* MKVToolNix GUI: header editor: fixed pixelated icons on higher display
  scaling values. Fixes #3420.

## Build system changes

* bug fix: libFLAC detection is now done via `pkg-config`, and the
  corresponding compiler flags are honored. Fixes static compilation with
  newer versions of libFLAC with MXE where a compiler definition is required
  to signal that it libFLAC wasn't built as a DLL.

Leave a Comment