MKVToolnix is a set of tools to create, alter and inspect Matroska (and WebM) files. With these tools one can: * Get information about Matroska files (mkvinfo) * Extract tracks/data from Matroska files (mkvextract) * Create Matroska files from other media files (mkvmerge) * Modify properties of existing Matroska files (mkvpropedit) MKVToolnix requires libebml, libmatroska and wxGTK all of which are available on Slackbuilds.org.