MKVToolNix is a collection of tools for the Matroska media container format by Moritz Bunkus. It’s free and open-source and compatible with Linux, Windows, Mac. No need to worry whether the program is too complicated for you, I’ll demonstrate how to get rid of extra audio tracks in MKV with it in detail.
Remove audio tracks in MKV with MKVToolNix GUI
Step 1. Download MKVToolNix GUI at https://www.fosshub.com/MKVToolNix.html, install the program. Run mkvtoolnix-gui.exe or launch the program from start menu.
Step 2. From the “Multiplexer” tab, drag and drop MKV files with multiple audio tracks to the “Source files” window, and all audio tracks within the movie will be shown below in the form of audio codecs. The language of each codec will also be displayed.
Step 3. Uncheck the unwanted audio tracks to keep the language you prefer, or uncheck them all to mute the movie.
Step 4. Define the destination path at the “Destination file” box below.
Step 5. When it’s all set, hit “Stat multiplexing” to delete audio track from MKV.