It can be used to show and add audio tracks and subtitles or simply just check the integrity of the file by just browsing it.

MKVToolNix is some software tools that include mkvmerge, mkvinfo, mkvextract, mkvpropedit, mmg and others. It features support for treating several input files as if they had been concatenated binarily right into a single big input file. With MKVToolNix you can produce, split, edit, mux, demux, merge, extract or inspect Matroska files. They do for Matroska what the OGMtools do for the OGM format and then some.mkvinfo, mkvextract, mkvpropedit and mmg, which permit you to to generate, manipulate and inspect Matroska (.MKV) files in a number of ways. MKVToolNix Free 32-bit Download – MKVToolNix by bunkus is some tools to generate, alter, and inspect Matroska files under Linux and Windows. It is a command-line tool, but there are also GUI front-ends available. MKVToolNix available for Windows, macOS, and Linux. It can also be used to convert Matroska files to other formats, such as MP4, AVI, and WMV. MKVToolNix can be used to create, edit, mux, demux, merge, extract, and inspect Matroska files.

Free for mac download MKVToolnix 78.0