: The file container ( Matroska Video ). This format is popular because it can hold multiple audio tracks and subtitle streams in one file .
This filename follows a standard format used by digital media distributors and fan groups. : The episode number (Episode 5).
: This is a CRC32 hash (a unique alphanumeric code). Distributors include this so you can verify the file is not corrupted and was downloaded exactly as intended.
: The audio codec (Advanced Audio Coding), a standard format for compressed digital audio.