The MKV (Matroska Video) format is an open-source multimedia container, not just a video format. It is unique because it can hold an unlimited number of video, audio, and subtitle tracks, along with metadata and cover art . Key features of the format include:

: Designed to be extensible, meaning new features can be added to the format over time without breaking compatibility with older players.

: If you have multiple files with similar cryptic names, utilities like JMkvpropedit allow you to batch-edit titles and tags without re-encoding the entire video.

If you have a file like this and want to make it "official" by adding a poster or changing its properties, you can use specialized tools:

: It can include multiple language tracks and subtitles, making it the global standard for fan-subbed anime and international cinema. How to Manage Your File