If you have ever stumbled upon an open web directory (often starting with http://example.com/videos/ ) promising a treasure trove of high-definition movies, you have likely encountered the dreaded "Index of /parent directory" page. Instead of a beautiful streaming interface, you see a plain list of files. Worse, when you try to play that 1080p.mkv file, you get errors, broken links, or a file that won't stream.
mkvmerge -o output_fixed.mkv input_broken.mkv index of parent directory 1080p mkv fix