use MKVToolNix / mkvmerge on Mac OS 10.10 (Yosemite) and later

So you've read about mkvmerge / MKVToolNix / MKVToolNix GUI , and want to use these video tools on your Mac : 

The latest version of the GUI (25.0) will work only with Mac OS X 10.11 and higher, because of an update of the Qt version (Qt is the GUI library MKVToolNix GUI is built with). This new version of Qt, which only supports El Capitan and later, was implemented after version 24.0 of MKVToolNix GUI.

– So if you're using one of the 3 latest Mac systems to date (10.11, 10.12, 10.13), no problem : 

You can use the 25.0 version of MKVToolNix GUI. Download it here : https://www.fosshub.com/MKVToolNix.html.

– For previous mac OS versions (namely 10.10 – the one I did test) : 

Be happy to know that version 24.0.0 works fine under MacOS X 10.10 (Yosemite). Download it here :

http://www.oldfoss.com/MKVToolNix.html

Of course, do not update to version 25.0 if you want to keep it running on Mac OS 10.10 Yosemite.

On a side note, if you want to use the command-line version of the mkv tools, be aware that the executables (mkvextract, mkvinfo, mkvmerge and mkvproedit) taken from inside the v25.0 app do work flawlessly on 10.10 as well :

Right-click on the app in Finder, then "Show package contents" : navigate to MKVToolNix-25.0.0/Contents/MacOS/ ) and copy the files mkvextract, mkvinfo, mkvmerge and mkvproedit to /usr/local/bin .

in Terminal, type 

     mkvextract -h 

     mkvinfo -h 

     mkvmerge -h 

     mkvproedit -h

to read how to use these commands.

But : do not replace the executables in the 24.0 app with the newer ones.

Enjoy.