MKVToolnix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. They do for Matroska what the OGMtools do for the OGM format and then some.
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.

• MKV Files
  
• MPEG-4 (ASF, WMV, QuickTime, AVC, VC-1, H.264 ...)
  

• Release Date: Apr 10, 2021
• Download(s):
  mkvtoolnix-32-bit-56.1.0-setup.exe
  mkvtoolnix-32-bit-56.1.0.7z
  mkvtoolnix-64-bit-56.1.0-setup.exe
  mkvtoolnix-64-bit-56.1.0.7z
  MKVToolNix-56.1.0.dmg
  MKVToolNix_GUI-56.1.0-x86_64.AppImage
• 
  
  
  
  * mkvmerge: AAC: added support for LOAS/LATM files with channel configuration
  indexes 9–21 (e.g. channel count 22.2 for index 13) according to Rec. ITU-R
  
  
  
  
  * mkvmerge: HEVC/H.265 parser: fixed invalid memory access that could happen
  when reading certain types of HEVC data (e.g. with changing parameter sets
  mid-stream) from certain containers (e.g. Matroska). This bug was introduced
  * mkvextract: AAC: mkvextract will now abort with an useful error message when
  the user tries to extract a track whose 'audio-specific config' element in
  `CodecPrivate` signals a number of channels of 7 or greater than 8 as that
  
  
  
  
  * configure: the `--enable-ubsan` option hasn't actually enabled anything