Download MKVToolnix 52.0.0

Moritz Bunkus has released version 52 of MKVToolNix. This open source program allows matroska files to be viewed, edited and converted. For example, sound tracks 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, macOS, and various Linux distributions. The changelog for this release looks like this:

New features and enhancements

• MKVToolNix GUI: job queue: the maximum number of jobs to run concurrently can now be increased in the preferences. The default remains at 1. Implementations #2984.
• MKVToolNix GUI: the GUI will now add a context-specific default extension to file names selected for saving on platforms that don’t add one itself (eg GNOME). For example, when saving multiplexer settings the extension .mtxcfg will be added. implementations #2983.
• MKVToolNix GUI: added an option to the preferences for the window to stay on top of other windows. implementations #2967.

Bug fixes

• mkvextract: h.265/HEVC extraction: the code for skipping extraction of prefix SEI NALUs in the first frame was skipping two bytes too few, resulting in broken processing of all following bytes. Patch by Mike Chen.
• libEBML: the optional, bundled version of libEBML was updated to v1.4.1.

Build system changes

• libEBML v1.4.1 is now required due to a bug in libEBML that caused pointers to just-freed memory being returned to the caller under certain invalid data constellations, causing use-after-free errors in all of MKVToolNix’s programs. Fixes #2989.