: MP4 (A common container format for video and audio).
The request string The.Ark.S01E05.720p.MP4.LE... contains standard metadata for digital media: : The Ark , Season 1, Episode 5. Resolution : 720p (High Definition, 1280x720 pixels).
: LE often refers to the release group or specific encoding parameters used by the uploader. Production & Streaming Network : The series is a SYFY original production.