https://mkvtoolnix.download/doc/mkvinfo.html
mkvinfo -- Print information about elements in Matroska files
print informationabout elementsmkvinfomatroskafiles
https://www.jsclasses.org/browse/file/5854.html
MKVInfo.min.js - Javascript MKV Parser - JS Classes
Main class (minified). MKVInfo.min.js This object can parse and extract information from MKV video files. It can take the URL or selected file of a MKV video...
mkvinfominjsjavascriptparser