MKVToolNix 31.0.0

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

15.7 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

  • all programs: added a new option --abort-on-warnings that will cause the program to abort after it has emitted the first warning, similar to how it aborts after the first error. Implements #2493.
  • mkvmerge, mkvextract: when closing files that were opened for writing, cached data will not be flushed to storage automatically anymore. This reverts the workaround implemented for #2469. A new option was added to both programs (--flush-on-close) that re-enables flushing for people who are affected by data loss such as described in #2469.
  • The reason is that automatic flushing causes long delays in processing queues when the output by mkvmerge/mkvextract isn’t the final product but just an intermediate result to be processed further. Implements #2480.
  • MKVToolNix GUI: multiplexer: the dialog previewing different character sets for text subtitles will now keep the position of the displayed text when switching between character sets. Implements #2489.

Bug fixes

  • mkvmerge: AVI reader: using DV type 1 AVIs will now result in an unsupported file type being reported (as the underlying AVI library doesn’t support them) instead of crashing mkvmerge. Fixes #2491.
  • mkvmerge: HEVC: the height of interlaced streams will now be set correctly to the height of the full frame instead of the height of a single interlaced field. Fixes #2446.
  • mkvmerge: MP4 reader: edit lists consisting solely of elements that mkvmerge doesn’t support (such as dwells) are simply ignored. Before no data was read for such tracks at all. Fixes #2487.
  • mkvmerge: text subtitles: entries with an explicit duration of 0ms will now be handled correctly: the 0ms duration will be stored in Matroska instead of the difference between the current and the following entry. Fixes #2490.
  • MKVToolNix GUI: multiplexer, chapter editor: fixed drag & drop handling with Qt 5.12.0 and newer. Fixes #2472.
  • MKVToolNix GUI: multiplexer: the GUI did not clean up temporary files created when running mkvmerge. Fixes #2499.

Build system changes

  • Qt 5.4.0 or newer has required (up from 5.3.0) since version 30.0.0; I just forgot to include this entry.